class PostMerger class CannotMergeError < StandardError; end def initialize(user, posts) @user = user @posts = posts end def merge return unless ensure_at_least_two_posts ensure_same_topic! ensure_same_user! guardian = Guardian.new(@user) ensure_staff_user!(guardian) posts = @posts.sort_by do |post| guardian.ensure_can_delete!(post) post.post_number end post_content = posts.map(&:raw) post = posts.pop changes = { raw: post_content.join("\n\n"), edit_reason: I18n.t("merge_posts.edit_reason", count: posts.length, username: @user.username) } revisor = PostRevisor.new(post, post.topic) revisor.revise!(@user, changes) do posts.each { |p| PostDestroyer.new(@user, p).destroy } end end private def ensure_at_least_two_posts @posts.count >= 2 end def ensure_same_topic! unless @posts.map(&:topic_id).uniq.length == 1 raise CannotMergeError.new(I18n.t("merge_posts.errors.different_topics")) end end def ensure_same_user! unless @posts.map(&:user_id).uniq.length == 1 raise CannotMergeError.new(I18n.t("merge_posts.errors.different_users")) end end def ensure_staff_user!(guardian) raise Discourse::InvalidAccess unless guardian.is_staff? end end