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Created May 16, 2018 07:27
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how to use build method to create new object
Raw
ruby
class Post < ActiveRecord::Base
has_many :comments
end
class Comment < ActiveRecord::Base
belongs_to :post
end
post = Post.first
comment = Comment.new
comment.post_id = post.id
puts comment.post_id # prints 1
comment = post.comments.build
puts comment.post_id # prints 1
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