Allow use of inlines for many-to-many fields

[sveri]

When you try to create an inline field in admin.py for a manytomanyfield you always get the following error:
<class 'MyClass'> has no ForeignKey to <class 'OtherClass'>

It would be nice to be able to use inlines for many to many relations.

[Russell Keith-Magee]

The documentation you reference refers to many-to-many models that use an intermediate table, not to m2m relations in general.

[sveri]

Ok, thats true.
But is there a plan to support that for the future?
Should i open a feature request?

[Russell Keith-Magee]

I'm not aware of any plans to add this feature. I've modified this ticket to reflect the feature request.

You may get your wish through a back channel. The changes required by #10109 will probably make this feature possible with no extra effort, as that ticket will require introducing a dummy model representation of m2m fields, and this dummy model may be compatible use in inlines. I plan to commit a fix for #10109 in the near future as a precursor to multiple-database and non-SQL backend support. I'll try to keep this ticket in mind before I commit.

[Russell Keith-Magee]

(In [11712]) Fixed #11795 -- Document (and slightly simplify) the use of inlines for m2m relations.

This is the first immediate benefit of m2m relations having an autogenerated model.