I tried your example in sqlalchemy 0.6 by manually plugging in api.py library (attached) that I got from here<https://bitbucket.org/miracle2k/sqlalchemy/src/2d28ed97d3221a133b4b297a229deb294088affe/lib/sqlalchemy/ext/declarative/api.py?at=default> .
I get this error:
File "path\to\sample_orm.py", line 33, in map_
props[v] = cls.__table__.c[k]
File "path\to\lib\python2.6\sqlalchemy\util.py", line 731, in __getitem__
KeyError: 'Description'
Here's my code:
from sqlalchemy.orm import mapper
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from .api import DeferredReflection, declared_attr --> this is coming from
attached api.py file
Base = declarative_base()
e = create_engine("sqlite://", echo=True)
e.execute("""
create table Sample (
Id integer primary key,
Name varchar,
Description varchar,
IsActive varchar
)
""")
class MagicMappyThing(DeferredReflection):
@declared_attr
def __mapper_cls__(cls):
def map_(cls, *arg, **kw):
props = kw.setdefault("properties", {})
for k, v in cls.__map__.items():
props[v] = cls.__table__.c[k]
return mapper(cls, *arg, **kw)
return map_
class Sample(MagicMappyThing, Base):
__tablename__ = 'Sample'
__map__ = {'Id': 'id', 'Name': 'name', 'Description': 'description',
'IsActive': 'is_active'}
def __init__(self, id, name, description, is_active):
self.id = id
self.name = name
self.description = description
self.is_active = is_active
MagicMappyThing.prepare(e)
# s = Session(e)
# s.add(Sample(id=1, name='some name', description='foo', is_active='foo'))
# s.commit()
On Mon, Aug 26, 2013 at 5:52 PM, Praveen <praveen.venk...@gmail.com> wrote:
> It works only in 0.7 like you said. I can't find any way to crack this
> situation in 0.6. :-(
>
>
> On Mon, Aug 26, 2013 at 5:49 PM, Praveen <praveen.venk...@gmail.com>wrote:
>
>> nvm... i found it.
>>
>>
>> On Mon, Aug 26, 2013 at 5:46 PM, Praveen <praveen.venk...@gmail.com>wrote:
>>
>>> Could you please point me to the link where I can find the example ?
>>>
>>>
>>> On Mon, Aug 26, 2013 at 5:41 PM, Michael Bayer <mike...@zzzcomputing.com
>>> > wrote:
>>>
>>>> you'd need to hand-roll the deferred reflection part, there's an
>>>> example in 0.7 called "declarative_reflection" but it might require
>>>> features that aren't in 0.6.
>>>>
>>>> I'd not be looking to add any kind of slick/magic systems to an 0.6
>>>> app, 0.6 is very early in the curve for declarative techniques. upgrade it
>>>> first, otherwise stick with the hacky approaches you have.
>>>>
>>>>
>>>>
>>>> On Aug 26, 2013, at 5:38 PM, Praveen <praveen.venk...@gmail.com> wrote:
>>>>
>>>> Does this work in sqlalchemy 0.6.1 ?
>>>>
>>>>
>>>> On Mon, Aug 26, 2013 at 5:36 PM, Michael Bayer <
>>>> mike...@zzzcomputing.com> wrote:
>>>>
>>>>> OK here we are, had to switch approaches due to a bug with the column
>>>>> reflect event, to use the aforementioned __mapper_cls__ (had the name
>>>>> wrong), so I think you'll see this is a pretty open-ended way to control
>>>>> how something maps as you're given total access to mapper() here:
>>>>>
>>>>> from sqlalchemy import *
>>>>> from sqlalchemy.orm import *
>>>>> from sqlalchemy.ext.declarative import declarative_base, declared_attr
>>>>> from sqlalchemy.ext.declarative import DeferredReflection
>>>>> from sqlalchemy import event
>>>>>
>>>>> Base = declarative_base()
>>>>>
>>>>> e = create_engine("sqlite://", echo=True)
>>>>> e.execute("""
>>>>> create table sample (
>>>>> Id integer primary key,
>>>>> Name varchar,
>>>>> Description varchar,
>>>>> IsActive varchar
>>>>> )
>>>>> """)
>>>>>
>>>>> class MagicMappyThing(DeferredReflection):
>>>>> @declared_attr
>>>>> def __mapper_cls__(cls):
>>>>> def map_(cls, *arg, **kw):
>>>>> props = kw.setdefault("properties", {})
>>>>> for k, v in cls.__map__.items():
>>>>> props[v] = cls.__table__.c[k]
>>>>> return mapper(cls, *arg, **kw)
>>>>> return map_
>>>>>
>>>>> class Sample(MagicMappyThing, Base):
>>>>> __tablename__ = 'sample'
>>>>> __map__ = {'Id': 'id', 'Name': 'name', 'Description':
>>>>> 'description', 'IsActive': 'is_active'}
>>>>>
>>>>> def __init__(self, id, name, description, is_active):
>>>>> self.id = id
>>>>> self.name = name
>>>>> self.description = description
>>>>> self.is_active = is_active
>>>>>
>>>>> MagicMappyThing.prepare(e)
>>>>>
>>>>> s = Session(e)
>>>>>
>>>>> s.add(Sample(id=1, name='some name', description='foo',
>>>>> is_active='foo'))
>>>>> s.commit()
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Aug 26, 2013, at 5:17 PM, Michael Bayer <mike...@zzzcomputing.com>
>>>>> wrote:
>>>>>
>>>>>
>>>>> On Aug 26, 2013, at 5:16 PM, Michael Bayer <mike...@zzzcomputing.com>
>>>>> wrote:
>>>>>
>>>>>
>>>>> On Aug 26, 2013, at 4:35 PM, Praveen <praveen.venk...@gmail.com>
>>>>> wrote:
>>>>>
>>>>> The problem with using Mixins is that you need to know the definition
>>>>> of columns already for creating the mixin class. What I am trying to do is
>>>>> more like get the definition dynamically on the fly.Take a look at this:
>>>>>
>>>>>
>>>>> here's a simple way to add reflection events which intercept the
>>>>> Column and add the .key of your choice, and saves on code by making use of
>>>>> the existing DeferredReflection mixin instead of hand-coding it.
>>>>>
>>>>>
>>>>> except it doesnt work yet, give me 10 minutes.
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Have a nice day !!!
>>>>
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>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Have a nice day !!!
>>>
>>
>>
>>
>> --
>> Have a nice day !!!
>>
>
>
>
> --
> Have a nice day !!!
>
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api.py
Description: Binary data
