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how to use build method to create new object
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| 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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