sqlalchemy-tickets — trac tickets and updates forwarded to this list

[Sqlalchemy-tickets] [sqlalchemy] #2954: This point is similar in nature to the previous one. When people begin to exercise and don't see results overnight, they become discouraged and fail to follow their exercise routine as rigidly as they should. So, they may follow a programme for 3 weeks, have a week off, feel bad, then try again and exercise for 3 more weeks, have a week off, and so on...

[sqlalchemy <mi...@zz...>]

#2954: This point is similar in nature to the previous one. When people begin to
exercise and don't see results overnight, they become discouraged and fail
to follow their exercise routine as rigidly as they should. So, they may
follow a programme for 3 weeks, have a week off, feel bad, then try again
and exercise for 3 more weeks, have a week off, and so on...
---------------------------------+-----------------------------------------
 Reporter:  abbieella            |           Owner:  zzzeek
     Type:  defect               |          Status:  new
 Priority:  medium               |       Milestone:
Component:  cextensions          |        Severity:  no triage selected yet
 Keywords:  GARCINIA CAMBOGIA    |  Progress State:  awaiting triage
  PRO                            |
---------------------------------+-----------------------------------------
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--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2954>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

[Sqlalchemy-tickets] [sqlalchemy] #2953: speak to the staff. Propose that you happen to be taking into consideration a number of other gyms at the same time and find out what type of offer they can current you with correct absent.

[sqlalchemy <mi...@zz...>]

#2953: speak to the staff. Propose that you happen to be taking into consideration
a number of other gyms at the same time and find out what type of offer
they can current you with correct absent.
---------------------------------+-----------------------------------------
 Reporter:  vanezapow            |           Owner:  zzzeek
     Type:  defect               |          Status:  new
 Priority:  medium               |       Milestone:
Component:  cextensions          |        Severity:  no triage selected yet
 Keywords:  Raspberry Ultra      |  Progress State:  awaiting triage
  Ketone                         |
---------------------------------+-----------------------------------------
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--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2953>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2932: textasfrom compatibility with columns, query

[sqlalchemy <mi...@zz...>]

#2932: textasfrom compatibility with columns, query
-----------------------------------+-------------------------------
      Reporter:  zzzeek            |      Owner:  zzzeek
          Type:  defect            |     Status:  closed
      Priority:  highest           |  Milestone:  0.9.3
     Component:  sql               |   Severity:  major - 1-3 hours
    Resolution:  fixed             |   Keywords:
Progress State:  completed/closed  |
-----------------------------------+-------------------------------
Changes (by zzzeek):

 * status:  reopened => closed
 * resolution:   => fixed
 * status_field:  in progress => completed/closed


Comment:

 rbf934018a52b4fe4c43745f is as far as we can go.  I tried also doing this:

 {{{
 #!python
 --- a/lib/sqlalchemy/sql/compiler.py
 +++ b/lib/sqlalchemy/sql/compiler.py
 @@ -274,7 +274,7 @@ class _CompileLabel(visitors.Visitable):
      __slots__ = 'element', 'name'

      def __init__(self, col, name, alt_names=()):
 -        self.element = col
 +        self.element = self._element = col
          self.name = name
          self._alt_names = (col,) + alt_names

 @@ -511,7 +511,7 @@ class SQLCompiler(Compiled):
                  add_to_result_map(
                          labelname,
                          label.name,
 -                        (label, labelname, ) + label._alt_names,
 +                        (label, labelname, label._element) +
 label._alt_names,
                          label.type
                  )
 }}}

 which allows the idea of `text("select A as
 X").columns(column("A").label("X"))`, but we get into naming conflicts
 there, and test.sql.test_query's tests for label conflicts does find one.
 The issue is if there are multiple columns named "A" with different
 labels, we can't do it as above.   It's possible we could do something
 specific for `TextAsFrom`, but it would have to correct for the same
 column() present twice perhaps.  I don't think it's a need right now.

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2932#comment:8>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2951: Confusing Query.get() behaviour. Possible insufficient criterion checking.

[sqlalchemy <mi...@zz...>]

#2951: Confusing Query.get() behaviour. Possible insufficient criterion checking.
-----------------------------------+-----------------------------------
      Reporter:  enomad            |      Owner:  zzzeek
          Type:  defect            |     Status:  closed
      Priority:  high              |  Milestone:  0.8.xx
     Component:  orm               |   Severity:  trivial - <10 minutes
    Resolution:  fixed             |   Keywords:  Query get criterion
Progress State:  completed/closed  |
-----------------------------------+-----------------------------------

Comment (by zzzeek):

 a security breach requires that an attacker can inject a specific,
 incorrect outcome into code that otherwise performs its function correctly
 when this injection is not taking place.

 In this case, there is no incorrect result that can be returned; get()
 does its job consistently.   It's just that a particular exception related
 to how get() was used may or may not be raised, and in that sense it
 behaves more like a query that is inconsistently available, but not in any
 way one that occasionally returns unexpected results versus expected
 results.  The results it returns, when it's not raising an exception, are
 consistent and are not subject to manipulation.

 A number is passed to get() - the primary key of an object.  That number
 is *always* the primary key that will be searched.  There is no way for
 the query to return the "wrong" result, as far as get() - get() always
 returns the object with the pk that you give it, end of story.  There is
 no attack vector by which an attacker can manipulate input into a system
 such that a different object is returned, and especially not a specific,
 different object.

 An application that writes out session.query(User).filter(User.password ==
 somepassword).get(5), is broken.  However, while putting that code in
 production is a security hazard, the hazard is because the code is
 entirely broken 100% of the time, not because it can be manipulated in
 some circumstances to return unexpected results.   That particular query
 will fail every time to check the user's password, which will be revealed
 in any test.  It's not any different from a query that fails to check the
 password at all.

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2951#comment:4>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2952: "cascading" declared_attr ?

[sqlalchemy <mi...@zz...>]

#2952: "cascading" declared_attr ?
-----------------------------------+-------------------------------
      Reporter:  zzzeek            |      Owner:  zzzeek
          Type:  enhancement       |     Status:  new
      Priority:  high              |  Milestone:  0.9.xx
     Component:  declarative       |   Severity:  major - 1-3 hours
    Resolution:                    |   Keywords:
Progress State:  not decided upon  |
-----------------------------------+-------------------------------

Comment (by zzzeek):

 note that I don't like this name too much.   It would be nicer if
 declared_attr could be the namespace, like:

 {{{
 @declared_attr(all_subclasses=True)
 def id(cls):
    ...

 @declared_attr.all_subclasses  #  ?
 def id(cls):
    ...

 }}}

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2952#comment:1>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

[Sqlalchemy-tickets] [sqlalchemy] #2952: "cascading" declared_attr ?

[sqlalchemy <mi...@zz...>]

#2952: "cascading" declared_attr ?
-------------------------+------------------------------------
 Reporter:  zzzeek       |           Owner:  zzzeek
     Type:  enhancement  |          Status:  new
 Priority:  high         |       Milestone:  0.9.xx
Component:  declarative  |        Severity:  major - 1-3 hours
 Keywords:               |  Progress State:  not decided upon
-------------------------+------------------------------------
 use case:

 {{{
 #!python
 from sqlalchemy import *
 from sqlalchemy.orm import *
 from sqlalchemy.ext.declarative import declarative_base, declared_attr,
 cascading_declared_attr

 Base = declarative_base()

 class HasId(object):
     @cascading_declared_attr
     def id(cls):
         if cls.__name__=='Content':
             return Column('id', Integer, primary_key=True)
         else:
             return Column('id', Integer, ForeignKey('content.id'),
 primary_key=True)

 class Content(HasId, Base):

     content_type = Column(String(20))

     @cascading_declared_attr
     def __tablename__(cls):
         return cls.__name__.lower()

 class Project(Content):
     currency  = Column(String(3))
     target = Column(Integer)
     current = Column(Integer)
 }}}

 {{{
 #!diff
 diff --git a/lib/sqlalchemy/ext/declarative/__init__.py
 b/lib/sqlalchemy/ext/declarative/__init__.py
 index 0ee4e33..4566324 100644
 --- a/lib/sqlalchemy/ext/declarative/__init__.py
 +++ b/lib/sqlalchemy/ext/declarative/__init__.py
 @@ -1300,7 +1300,7 @@ Mapped instances then make usage of
  from .api import declarative_base, synonym_for, comparable_using, \
      instrument_declarative, ConcreteBase, AbstractConcreteBase, \
      DeclarativeMeta, DeferredReflection, has_inherited_table,\
 -    declared_attr, as_declarative
 +    declared_attr, cascading_declared_attr, as_declarative


  __all__ = ['declarative_base', 'synonym_for', 'has_inherited_table',
 diff --git a/lib/sqlalchemy/ext/declarative/api.py
 b/lib/sqlalchemy/ext/declarative/api.py
 index 2418c6e..dc6c42b 100644
 --- a/lib/sqlalchemy/ext/declarative/api.py
 +++ b/lib/sqlalchemy/ext/declarative/api.py
 @@ -162,6 +162,26 @@ class declared_attr(interfaces._MappedAttribute,
 property):
      def __get__(desc, self, cls):
          return desc.fget(cls)

 +class cascading_declared_attr(declared_attr):
 +    """A :class:`.declared_attr` that will be invoked for all subclasses.
 +
 +    Use :class:`.cascading_declared_attr` when a particular
 ``@declared_attr``
 +    needs to be invoked individually for each subclass in a hierarchy::
 +
 +        class HasId(object):
 +            @cascading_declared_attr
 +            def id(cls):
 +                if has_inherited_table(cls):
 +                    return Column(Integer, ForeignKey("content.id"),
 primary_key=True)
 +                else:
 +                    return Column(Integer, primary_key=True)
 +
 +        class Content(HasId, Base):
 +            pass
 +
 +        class SubContent(Content):
 +            pass
 +    """

  def declarative_base(bind=None, metadata=None, mapper=None, cls=object,
                       name='Base', constructor=_declarative_constructor,
 diff --git a/lib/sqlalchemy/ext/declarative/base.py
 b/lib/sqlalchemy/ext/declarative/base.py
 index 4fda9c7..a8702cc 100644
 --- a/lib/sqlalchemy/ext/declarative/base.py
 +++ b/lib/sqlalchemy/ext/declarative/base.py
 @@ -31,7 +31,7 @@ def _declared_mapping_info(cls):


  def _as_declarative(cls, classname, dict_):
 -    from .api import declared_attr
 +    from .api import declared_attr, cascading_declared_attr

      # dict_ will be a dictproxy, which we can't write to, and we need to!
      dict_ = dict(dict_)
 @@ -96,6 +96,12 @@ def _as_declarative(cls, classname, dict_):
                              "not applying to subclass %s."
                              % (base.__name__, name, base, cls))
                  continue
 +            elif isinstance(obj, cascading_declared_attr):
 +                ret = obj.__get__(obj, cls)
 +                dict_[name] = column_copies[obj] = ret
 +                if isinstance(ret, (Column, MapperProperty)) and \
 +                    ret.doc is None:
 +                    ret.doc = obj.__doc__
              elif base is not cls:
                  # we're a mixin.
                  if isinstance(obj, Column):
 @@ -125,8 +131,8 @@ def _as_declarative(cls, classname, dict_):
                          "be declared as @declared_attr callables "
                          "on declarative mixin classes.")
                  elif isinstance(obj, declarative_props):
 -                    dict_[name] = ret = \
 -                            column_copies[obj] = getattr(cls, name)
 +                    ret = getattr(cls, name)
 +                    dict_[name] = column_copies[obj] = ret
                      if isinstance(ret, (Column, MapperProperty)) and \
                          ret.doc is None:
                          ret.doc = obj.__doc__
 }}}

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2952>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2951: Confusing Query.get() behaviour. Possible insufficient criterion checking.

[sqlalchemy <mi...@zz...>]

#2951: Confusing Query.get() behaviour. Possible insufficient criterion checking.
-----------------------------------+-----------------------------------
      Reporter:  enomad            |      Owner:  zzzeek
          Type:  defect            |     Status:  closed
      Priority:  high              |  Milestone:  0.8.xx
     Component:  orm               |   Severity:  trivial - <10 minutes
    Resolution:  fixed             |   Keywords:  Query get criterion
Progress State:  completed/closed  |
-----------------------------------+-----------------------------------

Comment (by enomad):

 >please explain fully why you think this bug is a security breach
 It can be security breach... when we want to check ownership of related
 item by something like

 {{{
 item = Item.query.join(User).filter(User == current_user).filter(Item.id
 == requested_item).one()
 if not item:
     raise 404
 }}}

 and think of get(id) is sugar of filter_by(id=id).one()

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2951#comment:3>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2951: Confusing Query.get() behaviour. Possible insufficient criterion checking.

[sqlalchemy <mi...@zz...>]

#2951: Confusing Query.get() behaviour. Possible insufficient criterion checking.
-----------------------------------+-----------------------------------
      Reporter:  enomad            |      Owner:  zzzeek
          Type:  defect            |     Status:  closed
      Priority:  high              |  Milestone:  0.8.xx
     Component:  orm               |   Severity:  trivial - <10 minutes
    Resolution:  fixed             |   Keywords:  Query get criterion
Progress State:  completed/closed  |
-----------------------------------+-----------------------------------
Changes (by zzzeek):

 * status:  new => closed
 * resolution:   => fixed
 * status_field:  in progress => completed/closed


Comment:

 backported to 0.8

 r99717570ff085ac2cda16d96155d0b206b5fe713 0.8

 r2a25e42c08e7541fa70dfc5e6b1ac843d6d02027 0.9

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2951#comment:2>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2951: Confusing Query.get() behaviour. Possible insufficient criterion checking.

[sqlalchemy <mi...@zz...>]

#2951: Confusing Query.get() behaviour. Possible insufficient criterion checking.
------------------------------+-----------------------------------
      Reporter:  enomad       |      Owner:  zzzeek
          Type:  defect       |     Status:  new
      Priority:  high         |  Milestone:  0.8.xx
     Component:  orm          |   Severity:  trivial - <10 minutes
    Resolution:               |   Keywords:  Query get criterion
Progress State:  in progress  |
------------------------------+-----------------------------------
Changes (by zzzeek):

 * priority:  medium => high
 * status_field:  awaiting triage => in progress
 * component:  cextensions => orm
 * severity:  no triage selected yet => trivial - <10 minutes
 * milestone:   => 0.8.xx


Comment:

 please explain fully why you think this bug is a security breach.  No
 illegal value is being injected here, the filter() criterion is being
 ignored and you're getting id #2, just as you would if the filter()
 criterion hadn't been used.   It is of course a bug.

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2951#comment:1>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

[Sqlalchemy-tickets] [sqlalchemy] #2951: Confusing Query.get() behaviour. Possible insufficient criterion checking.

[sqlalchemy <mi...@zz...>]

#2951: Confusing Query.get() behaviour. Possible insufficient criterion checking.
---------------------------------+-----------------------------------------
 Reporter:  enomad               |           Owner:  zzzeek
     Type:  defect               |          Status:  new
 Priority:  medium               |       Milestone:
Component:  cextensions          |        Severity:  no triage selected yet
 Keywords:  Query get criterion  |  Progress State:  awaiting triage
---------------------------------+-----------------------------------------
 Also I cant find any documentation about that. I think it can be security
 breach. Here is the code

 https://gist.github.com/stanislav88/8924167

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2951>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

[Sqlalchemy-tickets] [sqlalchemy] #2950: abstractconcretebase polish

[sqlalchemy <mi...@zz...>]

#2950: abstractconcretebase polish
-------------------------+------------------------------------
 Reporter:  zzzeek       |           Owner:  zzzeek
     Type:  defect       |          Status:  new
 Priority:  medium       |       Milestone:  0.9.3
Component:  declarative  |        Severity:  major - 1-3 hours
 Keywords:               |  Progress State:  in queue
-------------------------+------------------------------------
 seems to not be putting the class name into declarative registry:

 {{{
 #!python
 from sqlalchemy import *
 from sqlalchemy.orm import *
 from sqlalchemy.ext.declarative import declarative_base,
 AbstractConcreteBase

 Base = declarative_base()

 class A(Base):
     __tablename__ = 'a'
     id = Column(Integer, primary_key=True)

 class BC(AbstractConcreteBase, Base):
     pass

 class B(BC):
     __tablename__ = 'b'
     id = Column(Integer, primary_key=True)

     a_id = Column(Integer, ForeignKey('a.id'))
     __mapper_args__ = {
         "polymorphic_identity": "b",
         "concrete": True
     }

 class C(BC):
     __tablename__ = 'c'
     id = Column(Integer, primary_key=True)
     a_id = Column(Integer, ForeignKey('a.id'))
     __mapper_args__ = {
         "polymorphic_identity": "c",
         "concrete": True
     }

 # fails
 #A.collection = relationship("BC", primaryjoin="BC.a_id == A.id")

 # workaround
 configure_mappers()
 A.collection = relationship(BC, primaryjoin=BC.a_id == A.id)
 }}}

 check if there's a dupe for this also

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2950>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2949: event propagation regression

[sqlalchemy <mi...@zz...>]

#2949: event propagation regression
-----------------------------------+----------------------------------
      Reporter:  zzzeek            |      Owner:  zzzeek
          Type:  defect            |     Status:  closed
      Priority:  highest           |  Milestone:  0.9.3
     Component:  orm               |   Severity:  minor - half an hour
    Resolution:  fixed             |   Keywords:
Progress State:  completed/closed  |
-----------------------------------+----------------------------------
Changes (by zzzeek):

 * status:  new => closed
 * resolution:   => fixed
 * severity:  major - 1-3 hours => minor - half an hour
 * status_field:  in progress => completed/closed


Comment:

 rab738c21aa540cebf3c2f839e1

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2949#comment:1>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

[Sqlalchemy-tickets] [sqlalchemy] #2949: event propagation regression

[sqlalchemy <mi...@zz...>]

#2949: event propagation regression
---------------------+------------------------------------
 Reporter:  zzzeek   |           Owner:  zzzeek
     Type:  defect   |          Status:  new
 Priority:  highest  |       Milestone:  0.9.3
Component:  orm      |        Severity:  major - 1-3 hours
 Keywords:           |  Progress State:  in progress
---------------------+------------------------------------
 {{{
 #!python
 from sqlalchemy import *
 from sqlalchemy.orm import *
 from sqlalchemy.ext.declarative import declarative_base

 Base = declarative_base()

 class A(Base):
     __tablename__ = 'a'

     id = Column(Integer, primary_key=True)


 class B(A):
     pass


 from sqlalchemy import event

 @event.listens_for(Base, "load", propagate=True)   # boom
 def load(x, y):
     pass
 }}}

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2949>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2948: better replacement of columns w bound values on "local" side for lazy load

[sqlalchemy <mi...@zz...>]

#2948: better replacement of columns w bound values on "local" side for lazy load
------------------------------+-------------------------------
      Reporter:  mkadin       |      Owner:  zzzeek
          Type:  defect       |     Status:  new
      Priority:  high         |  Milestone:  0.9.3
     Component:  orm          |   Severity:  major - 1-3 hours
    Resolution:               |   Keywords:
Progress State:  in progress  |
------------------------------+-------------------------------

Comment (by zzzeek):

 hmmm nope, all the way back to 0.6.9 it still renders "FROM persons,
 cities WHERE ? = persons.city_id AND cities.deleted_at IS NULL", so this
 would be a new behavior.

 the new query is:

 {{{
 SELECT persons.id AS persons_id, persons.name AS persons_name,
 persons.deleted_at AS persons_deleted_at, persons.city_id AS
 persons_city_id
 FROM persons
 WHERE ? = persons.city_id AND ? IS NULL

 2014-02-09 14:24:18,009 INFO sqlalchemy.engine.base.Engine (1, '2014-02-09
 14:24:18.006459')
 }}}

 so whatever that second "?" is determines what we are comparing to NULL.

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2948#comment:5>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2948: better replacement of columns w bound values on "local" side for lazy load

[sqlalchemy <mi...@zz...>]

#2948: better replacement of columns w bound values on "local" side for lazy load
------------------------------+-------------------------------
      Reporter:  mkadin       |      Owner:  zzzeek
          Type:  defect       |     Status:  new
      Priority:  high         |  Milestone:  0.9.3
     Component:  orm          |   Severity:  major - 1-3 hours
    Resolution:               |   Keywords:
Progress State:  in progress  |
------------------------------+-------------------------------

Comment (by zzzeek):

 heh, not even, we dont need a warning, it produces option "B":

 {{{
 #!python
 e = create_engine("sqlite://", echo=True)

 Base.metadata.create_all(e)

 s = Session(e)

 s.add(City(people=[Person(), Person()]))

 s.commit()

 c1 = s.query(City).first()

 print c1.people  # produces [Person, Person]

 c1.deleted_at = datetime.datetime.now()
 s.commit()

 print c1.people  # produces empty list
 }}}

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2948#comment:4>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2820: session.merge/nullable primary keys - FlushError: Can't update table using NULL for primary key value

[sqlalchemy <mi...@zz...>]

#2820: session.merge/nullable primary keys - FlushError: Can't update table using
NULL for primary key value
-----------------------------------+-------------------------------
      Reporter:  elsdoerfer        |      Owner:  zzzeek
          Type:  defect            |     Status:  closed
      Priority:  medium            |  Milestone:  0.8.xx
     Component:  orm               |   Severity:  major - 1-3 hours
    Resolution:  worksforme        |   Keywords:
Progress State:  completed/closed  |
-----------------------------------+-------------------------------

Comment (by elsdoerfer):

 A quick post-mortem on this, since I finally had to address it:

 - Our pre-SQLAlchemy database had a permission table (user, group,
 permission), where a permission would apply to either a user or a group,
 and the other column was NULL.
 - It used a unique index rather than a primary key.
 - SQLAlchemy does not support a table without a primary key.
 - I wanted to trick SQLAlchemy by using  __mapper_args__ to define a
 primary key, but in truth using a unique key in the database, but during
 session.merge() you run into the FlushError above when using an instance
 with existing permissions relations.

 I've now simply removed the foreign keys from the user and group columns,
 and am storing an integer 0 for the column that does not apply.

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2820#comment:3>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2948: better replacement of columns w bound values on "local" side for lazy load (was: clarify behavior of explicit primaryjoin wrt backref, including importance of establishing both sides for unusual cases)

[sqlalchemy <mi...@zz...>]

#2948: better replacement of columns w bound values on "local" side for lazy load
------------------------------+-------------------------------
      Reporter:  mkadin       |      Owner:  zzzeek
          Type:  defect       |     Status:  new
      Priority:  high         |  Milestone:  0.9.3
     Component:  orm          |   Severity:  major - 1-3 hours
    Resolution:               |   Keywords:
Progress State:  in progress  |
------------------------------+-------------------------------
Changes (by zzzeek):

 * severity:  minor - half an hour => major - 1-3 hours
 * component:  documentation => orm
 * priority:  medium => high
 * milestone:  0.9.xx => 0.9.3
 * status_field:  in queue => in progress


Comment:

 change of plans, sorry.

 this can be detected and we can produce a more "correct" condition here,
 when we add a rule that all local side columns become bound values
 unconditionally.  its possible that older versions worked this way, will
 need to check.

 Sorry, the suggestion that lazyload render a JOIN threw me off here.  The
 bug is more about replacement of bound parameters.

 Patch:

 {{{
 #!diff
 diff --git a/lib/sqlalchemy/orm/relationships.py
 b/lib/sqlalchemy/orm/relationships.py
 index 62d4d6b..e21f8f4 100644
 --- a/lib/sqlalchemy/orm/relationships.py
 +++ b/lib/sqlalchemy/orm/relationships.py
 @@ -2479,6 +2479,7 @@ class JoinCondition(object):
          binds = util.column_dict()
          lookup = util.column_dict()
          equated_columns = util.column_dict()
 +        being_replaced = set()

          if reverse_direction and self.secondaryjoin is None:
              for l, r in self.local_remote_pairs:
 @@ -2486,16 +2487,30 @@ class JoinCondition(object):
                  _list.append((r, l))
                  equated_columns[l] = r
          else:
 +            # replace all "local side" columns, which is
 +            # anything that isn't marked "remote"
 +            being_replaced.update(self.local_columns)
              for l, r in self.local_remote_pairs:
                  _list = lookup.setdefault(l, [])
                  _list.append((l, r))
                  equated_columns[r] = l

          def col_to_bind(col):
 -            if col in lookup:
 -                for tobind, equated in lookup[col]:
 -                    if equated in binds:
 -                        return None
 +            if col in being_replaced or col in lookup:
 +                if col in lookup:
 +                    for tobind, equated in lookup[col]:
 +                        if equated in binds:
 +                            return None
 +                else:
 +                    assert not reverse_direction
 +                    # would like to warn here, but still some cases
 +                    # where the other column is still table-bound,
 +                    # so cant quite detect that here.
 +                    #util.warn(
 +                    #      "Relationship %s creating a fixed condition by
 "
 +                    #      "comparing local column %s to a constant; "
 +                    #      "consider revising this primaryjoin for
 greater "
 +                    #      "efficiency." % (self.prop, col))
                  if col not in binds:
                      binds[col] = sql.bindparam(
                          None, None, type_=col.type, unique=True)
 }}}

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2948#comment:3>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2948: clarify behavior of explicit primaryjoin wrt backref, including importance of establishing both sides for unusual cases

[sqlalchemy <mi...@zz...>]

#2948: clarify behavior of explicit primaryjoin wrt backref, including importance
of establishing both sides for unusual cases
--------------------------------+----------------------------------
      Reporter:  mkadin         |      Owner:  zzzeek
          Type:  defect         |     Status:  new
      Priority:  medium         |  Milestone:  0.9.xx
     Component:  documentation  |   Severity:  minor - half an hour
    Resolution:                 |   Keywords:
Progress State:  in queue       |
--------------------------------+----------------------------------

Comment (by mkadin):

 That makes sense.  I almost wonder if C might be the better choice?  If
 someone is asking sqlalchemy to do something it isn't sure about how to
 do, why not raise an error telling people to use a different primaryjoin?

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2948#comment:2>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2948: clarify behavior of explicit primaryjoin wrt backref, including importance of establishing both sides for unusual cases (was: generated sql when using custom primaryjoin and backref is funky.)

[sqlalchemy <mi...@zz...>]

#2948: clarify behavior of explicit primaryjoin wrt backref, including importance
of establishing both sides for unusual cases
--------------------------------+----------------------------------
      Reporter:  mkadin         |      Owner:  zzzeek
          Type:  defect         |     Status:  new
      Priority:  medium         |  Milestone:  0.9.xx
     Component:  documentation  |   Severity:  minor - half an hour
    Resolution:                 |   Keywords:
Progress State:  in queue       |
--------------------------------+----------------------------------
Changes (by zzzeek):

 * component:  orm => documentation
 * severity:  no triage selected yet => minor - half an hour
 * status_field:  awaiting triage => in queue
 * milestone:   => 0.9.xx


Comment:

 While there is a simple way to make this work in what I think is an
 acceptable way, it has to occur on your end (basically, setting a distinct
 primaryjoin, which is what you did.  Set it to None instead of "", btw.).
 I don't think there's a way that SQLAlchemy could be guessing how to
 interpret this, and beyond that, lazy loading doesn't generate JOINs.
 You can produce lazy loads that have JOINs rendered, but the JOIN would
 always have to come from an existing target mapper which is mapped to a
 JOIN in some way or a special "secondary" target that refers to a JOIN;
 that is, within "produce a lazy load from A to B", no new "JOIN" is
 produced that wasn't already defined.   The complexity of lazyload having
 to decide that a particular primaryjoin implies a JOIN should be created,
 when meanwhile it's really not what you want anyway, isn't really worth it
 and would make life harder for everyone (surprising, buggy, complicated,
 etc., and not even what you want!)

 The key pattern behind why this produces bad SQL is because the
 relationship of Person.city is specifically omitting a City that has a
 "deleted_at" value.    So then if we say, "given a City, what is the
 collection of People for that City?".  OK, if City.deleted_at is None,
 this is simple, it is all the People rows with city_id=<city.id>.

 But if City.deleted_at is non NULL.  Is it:  A. all the Person objects
 which refer to this City via city_id?  B. no Person objects, because City
 is deleted?   or C. this is an invalid request; for a City with deleted_at
 is non NULL, the list of Person objects associated with it is undefined?

 It's because the behavior of this backref case is inherently ambiguous
 that happens to correspond with SQL that makes no sense either.

 We can add documentation clarifying the behavior of primaryjoin when used
 in a backref but that's about it here.

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2948#comment:1>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

[Sqlalchemy-tickets] [sqlalchemy] #2948: generated sql when using custom primaryjoin and backref is funky.

[sqlalchemy <mi...@zz...>]

#2948: generated sql when using custom primaryjoin and backref is funky.
--------------------+-----------------------------------------
 Reporter:  mkadin  |           Owner:  zzzeek
     Type:  defect  |          Status:  new
 Priority:  medium  |       Milestone:
Component:  orm     |        Severity:  no triage selected yet
 Keywords:          |  Progress State:  awaiting triage
--------------------+-----------------------------------------
 Hello,

 In searching through some of our slowest queries, we came across some
 funky behavior with the sql that is generated with a relationship that
 included a custom primaryjoin and a backref.  I've attached a script,
 running against the latest sqlalchemy from pip, which will reproduce the
 issue on a postgres backend; I haven't tried any other DBs.

 For a relationship that looks like
 {{{
 city = relationship('City', primaryjoin='and_(City.id == Person.city_id,
 City.deleted_at == None)', backref='people')
 }}}

 The sql generated for accessing this relationship is fine.  However, for
 the backref, you would expect the sql to look like
 {{{
   SELECT persons.id, persons.name, persons.city_id FROM persons
   JOIN cities on persons.city_id = cities.id AND cities.deleted at IS NULL
   WHERE cities.id = %(some_city_id);
 }}}

 Though is is strange to have the {{{cities.deleted_at IS NULL}}} in the
 join clause, it is still valid sql no?  Instead, sqlalchemy gives the
 following sql:

 {{{
   SELECT persons.id AS persons_id, persons.name AS persons_name,
 persons.city_id AS persons_city_id
   FROM persons, cities
   WHERE %(param_1)s = persons.city_id AND cities.deleted_at IS NULL
 }}}

 This ends up scanning the entire cities table even though no info is
 needed.

 For now, we've used the backref() function to define a specific
 primaryjoin="" for the backref, which is fine, but I thought I'd report
 this as a bug as well.

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2948>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

[Sqlalchemy-tickets] [sqlalchemy] #2947: add many-to-one usage example to ORM tutorial, possibly brief usage examples to each of basic relational patterns

[sqlalchemy <mi...@zz...>]

#2947: add many-to-one usage example to ORM tutorial, possibly brief usage
examples to each of basic relational patterns
---------------------------+------------------------------------
 Reporter:  zzzeek         |           Owner:  zzzeek
     Type:  defect         |          Status:  new
 Priority:  high           |       Milestone:  0.9.xx
Component:  documentation  |        Severity:  major - 1-3 hours
 Keywords:                 |  Progress State:  in queue
---------------------------+------------------------------------


--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2947>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2946: standard_conforming_strings prior to PG 8.2

[sqlalchemy <mi...@zz...>]

#2946: standard_conforming_strings prior to PG 8.2
----------------------------------+-----------------------------------
      Reporter:  KyleJamesWalker  |      Owner:  zzzeek
          Type:  defect           |     Status:  new
      Priority:  medium           |  Milestone:  0.9.3
     Component:  postgres         |   Severity:  trivial - <10 minutes
    Resolution:                   |   Keywords:
Progress State:  in queue         |
----------------------------------+-----------------------------------

Comment (by KyleJamesWalker):

 Perfect thanks!

 I saw that but the requirements stated SQLAlchemy 0.8, and I need a newer
 version of SQLAlchemy as 0.8 failed when trying to connect to postgres 9.3
 (and I need to be connected to both DBs in my app right now).  I also
 looked and saw that it's code was inheriting off of PGDialect_psycopg2, so
 it would of had the same problem if it is in fact compatible with 0.9,
 without modifications.

 Thanks again.

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2946#comment:2>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

Re: [Sqlalchemy-tickets] [sqlalchemy] #2946: standard_conforming_strings prior to PG 8.2 (was: Redshift support)

[sqlalchemy <mi...@zz...>]

#2946: standard_conforming_strings prior to PG 8.2
----------------------------------+-----------------------------------
      Reporter:  KyleJamesWalker  |      Owner:  zzzeek
          Type:  defect           |     Status:  new
      Priority:  medium           |  Milestone:  0.9.3
     Component:  postgres         |   Severity:  trivial - <10 minutes
    Resolution:                   |   Keywords:
Progress State:  in queue         |
----------------------------------+-----------------------------------
Changes (by zzzeek):

 * severity:  no triage selected yet => trivial - <10 minutes
 * status_field:  awaiting triage => in queue
 * milestone:   => 0.9.3


Comment:

 here's a patch, can't commit it bc bitbucket is down:

 {{{
 #!python
 diff --git a/lib/sqlalchemy/dialects/postgresql/base.py
 b/lib/sqlalchemy/dialects/postgresql/base.py
 index 29584d1..43e77d5 100644
 --- a/lib/sqlalchemy/dialects/postgresql/base.py
 +++ b/lib/sqlalchemy/dialects/postgresql/base.py
 @@ -1567,7 +1567,8 @@ class PGDialect(default.DefaultDialect):
          #
 http://www.postgresql.org/docs/9.3/static/release-9-2.html#AEN116689
          self.supports_smallserial = self.server_version_info >= (9, 2)

 -        self._backslash_escapes = connection.scalar(
 +        self._backslash_escapes = self.server_version_info < (8, 2) or \
 +                    connection.scalar(
                                      "show standard_conforming_strings"
                                      ) == 'off'

 }}}

 but also, for redshift can you please use:

 https://pypi.python.org/pypi/redshift-sqlalchemy

 it's listed here in the docs:
 http://docs.sqlalchemy.org/en/rel_0_9/dialects/index.html#external-
 dialects

 redshift is not exactly postgresql in any case so the project there is
 maintaining compatibility.

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2946#comment:1>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

[Sqlalchemy-tickets] [sqlalchemy] #2946: Redshift support

[sqlalchemy <mi...@zz...>]

#2946: Redshift support
-----------------------------+-----------------------------------------
 Reporter:  KyleJamesWalker  |           Owner:  zzzeek
     Type:  defect           |          Status:  new
 Priority:  medium           |       Milestone:
Component:  postgres         |        Severity:  no triage selected yet
 Keywords:                   |  Progress State:  awaiting triage
-----------------------------+-----------------------------------------
 SQLAlchemy 9.1 does not support connecting to RedShfit because of the
 change in dialects/postgresql/base.py:
 {{{
 class PGDialect(default.DefaultDialect):
     ...
     def initialize(self, connection):
         ...
         self._backslash_escapes = connection.scalar(
                                     "show standard_conforming_strings"
                                     ) == 'off'
 }}}

 This crashes because there is no standard_conforming_string defined in
 redshift.  I think this check needs to be added "self.server_version_info
 >= (8, 2)", as the documentation for postgres starts mentioning this in
 8.2.
    http://www.postgresql.org/docs/8.2/static/runtime-config-
 compatible.html

 This was working on older versions of SQLAlchemy but I need to also
 connect to a postgres 9.3 db in my app, so I needed to upgrade.

 For now I've made a simple work around:

 Register the dialect in my app:
 {{{
 from sqlalchemy.dialects import registry
 registry.register("redshift", "myapp.dialects.redshift",
 "RedShiftDialect")
 }}}

 Define a new dialect in my app:
 {{{
 from sqlalchemy.dialects.postgresql.base import ENUM
 from sqlalchemy.dialects.postgresql.psycopg2 import PGDialect_psycopg2
 from sqlalchemy import types as sqltypes


 class RedShiftDialect(PGDialect_psycopg2):
     def initialize(self, connection):
         # Don't call super, it will crash, manually copying code that
 super would call
         #super(PGDialect, self).initialize(connection)
         self.implicit_returning = self.server_version_info > (8, 2) and \
             self.__dict__.get('implicit_returning', True)
         self.supports_native_enum = self.server_version_info >= (8, 3)
         if not self.supports_native_enum:
             self.colspecs = self.colspecs.copy()
             # pop base Enum type
             self.colspecs.pop(sqltypes.Enum, None)
             # psycopg2, others may have placed ENUM here as well
             self.colspecs.pop(ENUM, None)

         #
 http://www.postgresql.org/docs/9.3/static/release-9-2.html#AEN116689
         self.supports_smallserial = self.server_version_info >= (9, 2)

         # This breaks redshift, if a version check was here or exception
         # protection the RedShiftDialect would not be needed
         ###Suggest Adding Check: if self.server_version_info >= (8, 2):
 ###
         #self._backslash_escapes = connection.scalar(
         #                            "show standard_conforming_strings"
         #                            ) == 'off'

         # Don't call super, it will crash, manually copying code that
 super would call
         #super(PGDialect_psycopg2, self).initialize(connection)
         self._has_native_hstore = self.use_native_hstore and \
             self._hstore_oids(connection.connection) is not None
         self._has_native_json = self.psycopg2_version >= (2, 5)
 }}}

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2946>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python

[Sqlalchemy-tickets] [sqlalchemy] #2945: Increasing the co-pay will provide you lower monthy insurance premiums though you have to shell out more right now to make up for reduced expense of the premiums.

[sqlalchemy <mi...@zz...>]

#2945: Increasing the co-pay will provide you lower monthy insurance premiums
though you have to shell out more right now to make up for reduced expense
of the premiums.
-------------------------+-----------------------------------------
 Reporter:  Emper2977    |           Owner:  zzzeek
     Type:  defect       |          Status:  new
 Priority:  medium       |       Milestone:
Component:  cextensions  |        Severity:  no triage selected yet
 Keywords:  LXW PRO T    |  Progress State:  awaiting triage
-------------------------+-----------------------------------------
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--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2945>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python