Implement forum topic voting and tag change pruning (#3580)

app/models/bulk_update_request.rb

@@ -18,6 +18,9 @@ class BulkUpdateRequest < ApplicationRecord
   after_create :create_forum_topic
 
   scope :pending_first, lambda { order("(case status when 'pending' then 0 when 'approved' then 1 else 2 end)") }
+  scope :pending, ->{where(status: "pending")}
+  scope :expired, ->{where("created_at < ?", TagRelationship::EXPIRY.days.ago)}
+  scope :old, ->{where("created_at between ? and ?", TagRelationship::EXPIRY.days.ago, TagRelationship::EXPIRY_WARNING.days.ago)}
 
   module SearchMethods
     def default_order
@@ -121,7 +124,7 @@ class BulkUpdateRequest < ApplicationRecord
       end
     end
 
-    def reject!(rejector)
+    def reject!(rejector = User.system)
       transaction do
         update(status: "rejected")
         forum_updater.update("The #{bulk_update_request_link} (forum ##{forum_post.id}) has been rejected by @#{rejector.name}.", "REJECTED")

app/models/forum_post.rb

@@ -5,6 +5,7 @@ class ForumPost < ApplicationRecord
   belongs_to_creator
   belongs_to_updater
   belongs_to :topic, :class_name => "ForumTopic"
+  has_many :votes, class_name: "ForumPostVote"
   before_validation :initialize_is_deleted, :on => :create
   after_create :update_topic_updated_at_on_create
   after_update :update_topic_updated_at_on_update_for_original_posts
@@ -128,6 +129,10 @@ class ForumPost < ApplicationRecord
     end
   end
 
+  def voted?(user, score)
+    votes.where(creator_id: user.id, score: score).exists?
+  end
+
   def validate_topic_is_unlocked
     return if CurrentUser.is_moderator?
     return if topic.nil?
@@ -228,8 +233,12 @@ class ForumPost < ApplicationRecord
     ((ForumPost.where("topic_id = ? and created_at <= ?", topic_id, created_at).count) / Danbooru.config.posts_per_page.to_f).ceil
   end
 
-  def is_original_post?
-    ForumPost.exists?(["id = ? and id = (select _.id from forum_posts _ where _.topic_id = ? order by _.id asc limit 1)", id, topic_id])
+  def is_original_post?(original_post_id = nil)
+    if original_post_id
+      return id == original_post_id
+    else
+      ForumPost.exists?(["id = ? and id = (select _.id from forum_posts _ where _.topic_id = ? order by _.id asc limit 1)", id, topic_id])
+    end
   end
 
   def delete_topic_if_original_post

app/models/forum_post_vote.rb

@@ -0,0 +1,44 @@
+class ForumPostVote < ApplicationRecord
+  belongs_to_creator
+  belongs_to :forum_post
+  validates :creator_id, uniqueness: {scope: :forum_post_id}
+  validates :score, inclusion: {in: [-1, 0, 1]}
+  scope :up, -> {where(score: 1)}
+  scope :down, -> {where(score: -1)}
+  scope :by, ->(user_id) {where(creator_id: user_id)}
+  scope :excluding, ->(user_id) {where("creator_id <> ?", user_id)}
+
+  def up?
+    score == 1
+  end
+
+  def down?
+    score == -1
+  end
+
+  def meh?
+    score == 0
+  end
+
+  def fa_class
+    if score == 1
+      return "fa-thumbs-up"
+    elsif score == -1
+      return "fa-thumbs-down"
+    else
+      return "fa-meh"
+    end
+  end
+
+  def vote_type
+    if score == 1
+      return "up"
+    elsif score == -1
+      return "down"
+    elsif score == 0
+      return "meh"
+    else
+      raise
+    end
+  end
+end

app/models/tag_implication.rb

@@ -10,6 +10,9 @@ class TagImplication < TagRelationship
   validate :consequent_is_not_aliased
   validate :antecedent_and_consequent_are_different
   validate :wiki_pages_present, :on => :create
+  scope :expired, ->{where("created_at < ?", 2.months.ago)}
+  scope :old, ->{where("created_at between ? and ?", 2.months.ago, 1.month.ago)}
+  scope :pending, ->{where(status: "pending")}
 
   module DescendantMethods
     extend ActiveSupport::Concern

app/models/tag_relationship.rb

@@ -1,6 +1,9 @@
 class TagRelationship < ApplicationRecord
   self.abstract_class = true
 
+  EXPIRY = 60
+  EXPIRY_WARNING = 55
+
   attr_accessor :skip_secondary_validations
 
   belongs_to_creator
@@ -10,6 +13,10 @@ class TagRelationship < ApplicationRecord
   has_one :antecedent_tag, :class_name => "Tag", :foreign_key => "name", :primary_key => "antecedent_name"
   has_one :consequent_tag, :class_name => "Tag", :foreign_key => "name", :primary_key => "consequent_name"
 
+  scope :expired, ->{where("created_at < ?", EXPIRY.days.ago)}
+  scope :old, ->{where("created_at >= ? and created_at < ?", EXPIRY.days.ago, EXPIRY_WARNING.days.ago)}
+  scope :pending, ->{where(status: "pending")}
+
   before_validation :initialize_creator, :on => :create
   before_validation :normalize_names
   validates_format_of :status, :with => /\A(active|deleted|pending|processing|queued|error: .*)\Z/