[Sqlalchemy-tickets] Issue #4141: ARRAY does not fire attachment events (zzzeek/sqlalchemy)

[Michael B. <iss...@bi...>]

New issue 4141: ARRAY does not fire attachment events
https://bitbucket.org/zzzeek/sqlalchemy/issues/4141/array-does-not-fire-attachment-events

Michael Bayer:

this is the same issue as #3832


```
#!python

from sqlalchemy import *
from sqlalchemy import event


my_type = ARRAY(String)


@event.listens_for(my_type, "before_parent_attach")
def go(target, parent):
    print "yes"

Column('q', my_type)

```

second test:

```
#!python


from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.ext.declarative import declared_attr
from sqlalchemy.dialects import postgresql
from sqlalchemy.ext.mutable import MutableList


Base = declarative_base()


class Mixin(object):
    data = Column(MutableList.as_mutable(postgresql.ARRAY(String)))


class A(Base):
    __tablename__ = 'a'
    id = Column(Integer, primary_key=True)
    data = Column(MutableList.as_mutable(postgresql.ARRAY(String)))


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

e = create_engine('postgresql://scott:tiger@localhost/test', echo=True)
Base.metadata.drop_all(e)
Base.metadata.create_all(e)


s = Session(e)

a = A(data=['1'])
b = B(data=['1'])
s.add(a)
s.add(b)
s.commit()

a.data.append('2')
b.data.append('2')
s.commit()

print a.data
print b.data
```