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Ruby On Rails MCQs

To establish an association from a Post model to another Post model (say if one post is in response to another and there is a parent_post_id column on the posts table), you would add the following to the Post model:

belongs_to :post, :foreign_key => 'parent_post_id'

has_one :parent_post_id, :class_name => 'Post'

has_many :parent_posts, :foreign_key => 'parent_post_id'

has_one :parent_post, :class_name => 'Post'

belongs_to :parent_post, :class_name => 'Post'

Answer

Correct Answer: belongs_to :parent_post, :class_name => 'Post'

Explanation:

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