Placeholder for through value in ManyToManyField of abstract class

[MS]

If you have an abstract class with ManyToManyField it is possible to user %(class)s in related_name for generic related name. Same should be possible for through, to define a generic name for through tables.

Example:

class ClassA(models.Model):
    ...

class AbstractClass(models.Model):
    name = models.ManyToManyField(ClassA, related_name = '%(class)s_name', through = 'ClassA_%(class)s')

class MyClass(AbstractClass):
    ...

Class ClassA_MyClass(models.Model)
    class_a=models.ForeignKey(ClassA)
    my_class=models.ForeignKey(MyClass)

The applied patch uses the same mechanism as used for related_name.

[MS]

Patch for django/db/models/fields/related.py to use through in ManyToMany Field of an abstact class

[vitaliy]

Yes, very useful feature!

[Aymeric Augustin]

Change UI/UX from NULL to False.

[Aymeric Augustin]

Change Easy pickings from NULL to False.