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.
>>
>>
>>
>
>
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