Undefined Method 'Email' for Nil:Nilclass in Exibe the Mail of Table Father

undefined method `email' for nil:NilClass in Exibe the mail of table Father

# Model
class Comment < ActiveRecord::Base
  attr_accessible :comment, :user_id
end

#Controller
@comment = @post.comments.create(params[:comment].merge(:user_id => current_user.id))

But next would be better (:user_id is not accessible for mass-assignment):

@comment = @post.comments.build(params[:comment])
@comment.user = current_user
@comment.save

undefined method `email' for nil:NilClass in Model Associations Rails, dont works

May be using @post instead of post in view file will help?

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