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/models/poll_vote.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+# == Schema Information
+#
+# Table name: poll_votes
+#
+#  id         :bigint(8)        not null, primary key
+#  account_id :bigint(8)
+#  poll_id    :bigint(8)
+#  choice     :integer          default(0), not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+class PollVote < ApplicationRecord
+  belongs_to :account
+  belongs_to :poll, inverse_of: :votes
+
+  validates :choice, presence: true
+  validates_with VoteValidator
+
+  after_create_commit :increment_counter_cache
+
+  private
+
+  def increment_counter_cache
+    poll.cached_tallies[choice] = (poll.cached_tallies[choice] || 0) + 1
+    poll.save
+  end
+end