rails/rails — pull request #10538 by neerajdotname (2013-05-09 17:35:05+00:00)
Title: scope_chain should not be mutated for other reflections

Currently `scope_chain` uses same array for building different
`scope_chain` for different associations. During processing
these arrays are sometimes mutated and because of in-place
mutation the changed `scope_chain` impacts other reflections.

Fix is to dup the value before adding to the `scope_chain`.

Fixes #3882.