ruby - rails attaching database entry to logged in user -

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i'm new rails , done setting login system. however, want able make new blog post , attach account when logged in. how can attach post user_id list previous posts?

define model posts ( should have column name user_id )

model post < activerecord::base   belongs_to :user end

in user model 

model user < activerecord::base   has_many :posts end

with above defined associations user_id foriegn key user model can posts user below

 user.find(id).posts

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