Remove poll votation types

Unfortunately this feature wasn't properly reviewed and tested, and it
had many bugs, some of them critical and hard to fix, like validations
being skipped in concurrent requests.

So we're removing it before releasing version 1.1. We might add it back
in the future if we manage to solve the critical issues.

This commit reverts commit 836f9ba7.

db/migrate/20191030160221_drop_votation_types.rb

@@ -0,0 +1,11 @@
+class DropVotationTypes < ActiveRecord::Migration[5.0]
+  def up
+    drop_table :votation_set_answers
+    drop_table :poll_pair_answers
+    drop_table :votation_types
+  end
+
+  def down
+    fail ActiveRecord::IrreversibleMigration
+  end
+end

db/migrate/20191030160347_remove_order_positive_and_value_from_poll_answers.rb

@@ -0,0 +1,9 @@
+class RemoveOrderPositiveAndValueFromPollAnswers < ActiveRecord::Migration[5.0]
+  def change
+    remove_column :poll_answers, :value, :integer
+    remove_column :poll_answers, :positive, :boolean
+    remove_column :poll_answers, :order, :integer
+
+    remove_column :poll_question_answers, :hidden, :boolean, default: false
+  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: 20191030011956) do
+ActiveRecord::Schema.define(version: 20191030160347) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -1039,9 +1039,6 @@ ActiveRecord::Schema.define(version: 20191030011956) do
     t.string   "answer"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.boolean  "positive"
-    t.integer  "order"
-    t.integer  "value"
     t.index ["author_id"], name: "index_poll_answers_on_author_id", using: :btree
     t.index ["question_id", "answer"], name: "index_poll_answers_on_question_id_and_answer", using: :btree
     t.index ["question_id"], name: "index_poll_answers_on_question_id", using: :btree
@@ -1097,19 +1094,6 @@ ActiveRecord::Schema.define(version: 20191030011956) do
     t.index ["user_id"], name: "index_poll_officers_on_user_id", using: :btree
   end
 
-  create_table "poll_pair_answers", force: :cascade do |t|
-    t.integer  "question_id"
-    t.integer  "author_id"
-    t.integer  "answer_right_id"
-    t.integer  "answer_left_id"
-    t.datetime "created_at",      null: false
-    t.datetime "updated_at",      null: false
-    t.index ["answer_left_id"], name: "index_poll_pair_answers_on_answer_left_id", using: :btree
-    t.index ["answer_right_id"], name: "index_poll_pair_answers_on_answer_right_id", using: :btree
-    t.index ["author_id"], name: "index_poll_pair_answers_on_author_id", using: :btree
-    t.index ["question_id"], name: "index_poll_pair_answers_on_question_id", using: :btree
-  end
-
   create_table "poll_partial_results", force: :cascade do |t|
     t.integer "question_id"
     t.integer "author_id"
@@ -1153,7 +1137,6 @@ ActiveRecord::Schema.define(version: 20191030011956) do
     t.integer "question_id"
     t.integer "given_order", default: 1
     t.boolean "most_voted",  default: false
-    t.boolean "hidden",      default: false
     t.index ["question_id"], name: "index_poll_question_answers_on_question_id", using: :btree
   end
 
@@ -1670,29 +1653,6 @@ ActiveRecord::Schema.define(version: 20191030011956) do
     t.index ["user_id"], name: "index_visits_on_user_id", using: :btree
   end
 
-  create_table "votation_set_answers", force: :cascade do |t|
-    t.integer  "author_id"
-    t.integer  "votation_type_id"
-    t.string   "answer"
-    t.datetime "created_at",       null: false
-    t.datetime "updated_at",       null: false
-    t.index ["author_id"], name: "index_votation_set_answers_on_author_id", using: :btree
-    t.index ["votation_type_id"], name: "index_votation_set_answers_on_votation_type_id", using: :btree
-  end
-
-  create_table "votation_types", force: :cascade do |t|
-    t.integer  "questionable_id"
-    t.string   "questionable_type"
-    t.integer  "enum_type"
-    t.boolean  "open_answer"
-    t.boolean  "prioritized"
-    t.integer  "prioritization_type"
-    t.integer  "max_votes"
-    t.integer  "max_groups_answers"
-    t.datetime "created_at",          null: false
-    t.datetime "updated_at",          null: false
-  end
-
   create_table "votes", force: :cascade do |t|
     t.string   "votable_type"
     t.integer  "votable_id"
@@ -1801,5 +1761,4 @@ ActiveRecord::Schema.define(version: 20191030011956) do
   add_foreign_key "trackers", "users"
   add_foreign_key "users", "geozones"
   add_foreign_key "valuators", "users"
-  add_foreign_key "votation_set_answers", "votation_types"
 end