ruby on rails - Building a record with polymorphic assocation with FactoryGirl -

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i know why getting error when building record using factorygirl.

comment model belongs user , commentable through polymorphic association.

my factory looks this:

factorygirl.define   factory :comment     text "some text"     user_id 1     association :commentable, factory: :feedback   end end

when i'm build comment record using factorygirl, get:

activemodel::missingattributeerror: can't write unknown attribute `commentable_type'

i have no problem creating , manipulating comment object in console. can set , save commentable_type attribute freely. also, commentable_type exists in comments table.

any thoughts on why error occurs?

i ran migrations again using rake db:reset , error has disappeared. before that, have tried rollback related migration , migrate again, did not make change.

i still not know caused error, now, fixed.


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