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Ruby

Nested forms and models with Rails 4

Hi,

Could I get an explanation how to create nested forms on models with many to many associations?

I try to check stackoverflow, and rails casts... but I can't find any good documentation for how this is really done... I know we have the strong_attributes which do not make any sense, and then fields_for I can't get either... I don't have any code because I'm lost in this regard. There are a lot of blogs for past version of rails that do not work anymore.

Please help.