On 9/20/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>
> For example class1 has a dependency on class2. Other examples include
> single or multiple joins.
> ---------
> class class1(SQLObject):
> param1 = ForeignKey('class2')
>
> class class2(SQLObject):
> param1 = IntCol(length=255)
> ---------
>
> c1 = class1(param1=None)
>
> In a case such as this, how do I initialize a class1 object? Do i need
> to initialize a class2 object first and then pass it into the class1
> initializer? How would this work with a multiple join?
>
To answer your first question, there are two ways you could go about
this. As you say, you could create a class2 object first and then
pass it to the class1 initialiser. The other option is to slightly
modify your class1:
class class1(SQLObject):
param1 = ForeignKey('class2', default=None)
That way you can create a class1 instance and *then* pass it a class2
instance afterwards:
a_class1_instance = class1()
a_class2_instance = class2(param1=1)
a_class1_instance.param1 = a_class2_instance
For the multiple join to work you'd have to specify it in your class2
definition:
class class2(SQLObject):
param1 = IntCol(length=255)
class1s = MultipleJoin('class1')
You then access all class1's that reference a particular class2 like this:
class1_list = a_class2_instance.class1s
Hope this helps.
Lee
--
Lee McFadden
blog: http://www.splee.co.uk
work: http://fireflisystems.com
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