[Rails] setter method in rails 4 beta 1

I have a virtual attribute 'tags' , and defined a setter method for it tags=(val).

My setter method is not called while creating a Article.

I copied my rails 3.2.11 code in rails 4, it was perfectly working in former.

I want to know who can i use setter method for virtual attribute in rails 4.

Or is it a bug in rails 4.

I raised this as a issue in rails project

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