[Sqlalchemy-tickets] [sqlalchemy] #2914: sqlalchemy.orm.mapper.Mapper.attrs doesn't maintain order

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

#2914: sqlalchemy.orm.mapper.Mapper.attrs doesn't maintain order
-------------------------+-----------------------------------------
 Reporter:  tisdall      |           Owner:  zzzeek
     Type:  defect       |          Status:  new
 Priority:  low          |       Milestone:
Component:  cextensions  |        Severity:  no triage selected yet
 Keywords:               |  Progress State:  awaiting triage
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 `sqlalchemy.orm.mapper.Mapper.attrs` is an immutable wrapper around
 `sqlalchemy.orm.mapper.Mapper._props`.  However it uses
 `util.ImmutableProperties` which uses a regular `dict` as a backend and
 thus loses the order (`_props` is an OrderedDict).

 I think it should be changed to use something like:
 {{{
 #!python
 class ImmutableOrderedProperties(ImmutableContainer, OrderedProperties):
     """Provide immutable dict/object attribute to an underlying
 OrderedDict."""
 }}}

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Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2914>
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