Re: [Modeling-users] Many-to-many relationship example doesn't work?

[Ernesto R. <er...@si...>]

Hi,

You have to add the instance to both sides of the relation, the
a.setPerson(p)

is missing.

To add an instance to both sides of a relation, you can do also:

p.addObjectToBothSidesOfRelationshipWithKey(a, ’addresses’)

Erny


co...@sa... escribió:

>Hello,
>
>First of all thanks to Sabastien for his efforts creating this framework.
>Projects I'm involved now requires lots of Many-To-Many relations in E-R
>model, so I've tried adding methods (for tranparent access to correlation
>entity) as described in the example in UsersGuide 2.6.3. But those methods
>doesn't work. So I've copy-pasted example from user's guide, but it did'nt
>work as well.:
>i.e I add methods getAddresses(), addToAddresses()
>to the class "Person", Then I try to run a code, that uses those classes:
>-------------
>#test.py
>from Modeling.EditingContext import EditingContext
>from MM1 import Person, Address
>ec=EditingContext()
>p = Person.Person()
>a = Address.Address()
>p.addToAddresses(a)
>ec.insert(p)
>ec.insert(a)
>ec.saveChanges()
>-----------------
>I get an error:
>Traceback (most recent call last):
>  File "./test.py", line 8, in ?
>    p.addToAddresses(a)
>  File "/tmp/test2/MM1/Person.py", line 76, in addToAddresses
>    self.editingContext().insert(_pa)
>AttributeError: 'NoneType' object has no attribute 'insert'
>-----------------
>I've looked into CustomObject.py, and i could'nt find any assigment of
>REAL editing, context, only initial definition 'lambda self: None'
>Did i misunderstood something, or this example code in User's guide is
>just out-dated?
>
>Can someone please give me some guidlines?
>
>I'm using: Python 2.3, Modeling: 0.9-pre-17.1
>
>
>
>
>
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