discourse/app/models/post_reply.rb

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class PostReply < ActiveRecord::Base
belongs_to :post
belongs_to :reply, class_name: 'Post'
validates_uniqueness_of :reply_id, scope: :post_id
validate :ensure_same_topic
private
def ensure_same_topic
if post.topic_id != reply.topic_id
self.errors.add(
:base,
I18n.t("activerecord.errors.models.post_reply.base.different_topic")
)
end
end
end
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# == Schema Information
#
# Table name: post_replies
#
# post_id :integer
# reply_id :integer
# created_at :datetime not null
# updated_at :datetime not null
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#
# Indexes
#
# index_post_replies_on_post_id_and_reply_id (post_id,reply_id) UNIQUE
#