Remove unused columns from polls (#7125)

app/models/poll.rb

@@ -1,8 +1,4 @@
 class Poll < ApplicationRecord
-  self.ignored_columns = %w[
-    allow_multiple_selections
-  ]
-
   attr_accessor :poll_options_input_array
 
   serialize :voting_data

db/migrate/20200407083405_remove_unused_columns_from_polls.rb

@@ -0,0 +1,7 @@
+class RemoveUnusedColumnsFromPolls < ActiveRecord::Migration[5.2]
+  def change
+    safety_assured do
+      remove_column :polls, :allow_multiple_selections, :boolean, default: false
+    end
+  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: 2020_03_31_155903) do
+ActiveRecord::Schema.define(version: 2020_04_07_083405) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -855,7 +855,6 @@ ActiveRecord::Schema.define(version: 2020_03_31_155903) do
   end
 
   create_table "polls", force: :cascade do |t|
-    t.boolean "allow_multiple_selections", default: false
     t.bigint "article_id"
     t.datetime "created_at", null: false
     t.integer "poll_options_count", default: 0, null: false