Add polls (#10111)

* Add polls

Fix #1629

* Add tests

* Fixes

* Change API for creating polls

* Use name instead of content for votes

* Remove poll validation for remote polls

* Add polls to public pages

* When updating the poll, update options just in case they were changed

* Fix public pages showing both poll and other media

app/serializers/rest/poll_serializer.rb

@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+class REST::PollSerializer < ActiveModel::Serializer
+  attributes :id, :expires_at, :expired,
+             :multiple, :votes_count
+
+  has_many :dynamic_options, key: :options
+
+  attribute :voted, if: :current_user?
+
+  def id
+    object.id.to_s
+  end
+
+  def dynamic_options
+    if !object.expired? && object.hide_totals?
+      object.unloaded_options
+    else
+      object.loaded_options
+    end
+  end
+
+  def expired
+    object.expired?
+  end
+
+  def voted
+    object.votes.where(account: current_user.account).exists?
+  end
+
+  def current_user?
+    !current_user.nil?
+  end
+
+  class OptionSerializer < ActiveModel::Serializer
+    attributes :title, :votes_count
+  end
+end

app/serializers/rest/status_serializer.rb

@@ -21,6 +21,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
   has_many :emojis, serializer: REST::CustomEmojiSerializer
 
   has_one :preview_card, key: :card, serializer: REST::PreviewCardSerializer
+  has_one :poll, serializer: REST::PollSerializer
 
   def id
     object.id.to_s