sferik/rails_admin — pull request #2033 by quainjn (2014-08-03 20:06:53+00:00)
Title: Automatically determine read only on has_many through association

Fixes https://github.com/sferik/rails_admin/issues/1467. Automatically determine that has many through associations that go through multiple associations are readonly. This will prevent those inputs from being generated in the form and an error getting raised when the form is submitted.