discourse/lib/post_merger.rb

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# frozen_string_literal: true
class PostMerger
class CannotMergeError < StandardError
end
def initialize(user, posts)
@user = user
@posts = posts
end
def merge
return if @posts.count < 2
ensure_same_topic!
ensure_same_user!
guardian = Guardian.new(@user)
ensure_can_merge!(guardian)
posts =
@posts.sort_by do |post|
guardian.ensure_can_delete!(post)
post.post_number
end
post_content = posts.map(&:raw)
post = posts.pop
merged_post_raw = post_content.join("\n\n")
changes = {
raw: merged_post_raw,
edit_reason: I18n.t("merge_posts.edit_reason", count: posts.length, username: @user.username),
}
ensure_max_post_length!(merged_post_raw)
PostRevisor
.new(post, post.topic)
.revise!(@user, changes) { posts.each { |p| PostDestroyer.new(@user, p).destroy } }
end
private
def ensure_same_topic!
if @posts.map(&:topic_id).uniq.size != 1
raise CannotMergeError.new(I18n.t("merge_posts.errors.different_topics"))
end
end
def ensure_same_user!
if @posts.map(&:user_id).uniq.size != 1
raise CannotMergeError.new(I18n.t("merge_posts.errors.different_users"))
end
end
def ensure_can_merge!(guardian)
raise Discourse::InvalidAccess unless guardian.can_moderate_topic?(@posts[0].topic)
end
def ensure_max_post_length!(raw)
value = StrippedLengthValidator.get_sanitized_value(raw)
if value.size > SiteSetting.max_post_length
raise CannotMergeError.new(I18n.t("merge_posts.errors.max_post_length"))
end
end
end