Add emoji_reactions property to status api object

app/models/status.rb

@@ -62,6 +62,7 @@ class Status < ApplicationRecord
   belongs_to :reblog, foreign_key: 'reblog_of_id', class_name: 'Status', inverse_of: :reblogs, optional: true
 
   has_many :favourites, inverse_of: :status, dependent: :destroy
+  has_many :emoji_reactions, inverse_of: :status, dependent: :destroy
   has_many :bookmarks, inverse_of: :status, dependent: :destroy
   has_many :reblogs, foreign_key: 'reblog_of_id', class_name: 'Status', inverse_of: :reblog, dependent: :destroy
   has_many :reblogged_by_accounts, through: :reblogs, class_name: 'Account', source: :account
@@ -288,6 +289,29 @@ class Status < ApplicationRecord
     update_status_stat!(key => [public_send(key) - 1, 0].max)
   end
 
+  def emoji_reactions_grouped_by_name(account = nil)
+    (Oj.load(status_stat&.emoji_reactions || '', mode: :strict) || []).tap do |emoji_reactions|
+      if account.present?
+        emoji_reactions.each do |emoji_reaction|
+          emoji_reaction['me'] = emoji_reaction['account_ids'].include?(account.id.to_s)
+          emoji_reaction['count'] = emoji_reaction['account_ids'].size
+          emoji_reaction['account_ids'] -= account.excluded_from_timeline_account_ids.map(&:to_s)
+        end
+      end
+    end
+  end
+
+  def generate_emoji_reactions_grouped_by_name
+    records = emoji_reactions.group(:name).order(Arel.sql('MIN(created_at) ASC')).select('name, min(custom_emoji_id) as custom_emoji_id, count(*) as count, array_agg(account_id::text order by created_at) as account_ids')
+    Oj.dump(ActiveModelSerializers::SerializableResource.new(records, each_serializer: REST::EmojiReactionsGroupedByNameSerializer, scope: nil, scope_name: :current_user))
+  end
+
+  def refresh_emoji_reactions_grouped_by_name!
+    generate_emoji_reactions_grouped_by_name.tap do |emoji_reactions|
+      update_status_stat!(emoji_reactions: emoji_reactions)
+    end
+  end
+
   def trendable?
     if attributes['trendable'].nil?
       account.trendable?

app/models/status_stat.rb

@@ -9,6 +9,7 @@
 #  replies_count    :bigint(8)        default(0), not null
 #  reblogs_count    :bigint(8)        default(0), not null
 #  favourites_count :bigint(8)        default(0), not null
+#  emoji_reactions  :string
 #  created_at       :datetime         not null
 #  updated_at       :datetime         not null
 #
@@ -30,6 +31,10 @@ class StatusStat < ApplicationRecord
     [attributes['favourites_count'], 0].max
   end
 
+  def emoji_reactions
+    attributes['emoji_reactions'] || ''
+  end
+
   private
 
   def reset_parent_cache

app/serializers/rest/emoji_reactions_grouped_by_name_serializer.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+#   name: string,
+#count: number,
+#account_ids: Array<string>,
+#me: boolean,
+#url: string,
+#domain: string
+
+class REST::EmojiReactionsGroupedByNameSerializer < ActiveModel::Serializer
+    attributes :name, :count
+  
+    attribute :me, if: :current_user?
+    attribute :url, if: :custom_emoji?
+    attribute :static_url, if: :custom_emoji?
+    attribute :domain, if: :custom_emoji?
+    attribute :account_ids, if: :has_account_ids?
+
+    def current_user?
+        !current_user.nil?
+    end
+
+    def custom_emoji?
+        object.respond_to?(:custom_emoji)
+    end
+
+    def has_account_ids?
+        object.respond_to?(:account_ids)
+    end
+end
+  

app/serializers/rest/status_serializer.rb

@@ -6,7 +6,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
   attributes :id, :created_at, :in_reply_to_id, :in_reply_to_account_id,
              :sensitive, :spoiler_text, :visibility, :language,
              :uri, :url, :replies_count, :reblogs_count,
-             :favourites_count, :edited_at
+             :favourites_count, :emoji_reactions, :edited_at
 
   attribute :favourited, if: :current_user?
   attribute :reblogged, if: :current_user?
@@ -89,6 +89,10 @@ class REST::StatusSerializer < ActiveModel::Serializer
     end
   end
 
+  def emoji_reactions
+    object.emoji_reactions_grouped_by_name(current_user&.account)
+  end
+
   def reblogged
     if instance_options && instance_options[:relationships]
       instance_options[:relationships].reblogs_map[object.id] || false

db/migrate/20230223102416_add_emoji_reactions_to_status_stats.rb

@@ -0,0 +1,5 @@
+class AddEmojiReactionsToStatusStats < ActiveRecord::Migration[6.1]
+  def change
+    add_column :status_stats, :emoji_reactions, :string
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2023_02_22_235218) do
+ActiveRecord::Schema.define(version: 2023_02_23_102416) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -914,6 +914,7 @@ ActiveRecord::Schema.define(version: 2023_02_22_235218) do
     t.bigint "favourites_count", default: 0, null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.string "emoji_reactions"
     t.index ["status_id"], name: "index_status_stats_on_status_id", unique: true
   end
 

lib/mastodon/cache_cli.rb

@@ -45,6 +45,7 @@ module Mastodon
           status_stat.replies_count    = status.replies.where.not(visibility: :direct).count
           status_stat.reblogs_count    = status.reblogs.count
           status_stat.favourites_count = status.favourites.count
+          status_stat.emoji_reactions  = status.generate_emoji_reactions_grouped_by_name
 
           status_stat.save if status_stat.changed?
         end