refactors the way debate searches are done

app/models/debate.rb

@@ -6,6 +6,7 @@ class Debate < ActiveRecord::Base
   include Measurable
   include Sanitizable
   include PgSearch
+  include SearchCache
   include Filterable
 
   apply_simple_captcha
@@ -41,21 +42,23 @@ class Debate < ActiveRecord::Base
   visitable # Ahoy will automatically assign visit_id on create
 
   pg_search_scope :pg_search, {
-    against: {
-      title:       'A',
-      description: 'B'
-    },
-    associated_against: {
-      tags: :name
-    },
+    against: :ignored, # not used since the using: option has a tsvector_column
     using: {
-      tsearch: { dictionary: "spanish" },
+      tsearch: { dictionary: "spanish", tsvector_column: 'tsv', prefix: true }
     },
     ignoring: :accents,
     ranked_by: '(:tsearch)',
     order_within_rank: "debates.cached_votes_up DESC"
   }
 
+  def searchable_values
+    { title              => 'A',
+      author.username    => 'B',
+      tag_list.join(' ') => 'B',
+      description        => 'D'
+    }
+  end
+
   def description
     super.try :html_safe
   end

db/migrate/20160204134022_add_tsvector_to_debates.rb

@@ -0,0 +1,13 @@
+class AddTsvectorToDebates < ActiveRecord::Migration
+
+  def up
+    add_column :debates, :tsv, :tsvector
+    add_index :debates, :tsv, using: "gin"
+  end
+
+  def down
+    remove_index :debates, :tsv
+    remove_column :debates, :tsv
+  end
+
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160126090634) do
+ActiveRecord::Schema.define(version: 20160204134022) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -120,6 +120,7 @@ ActiveRecord::Schema.define(version: 20160126090634) do
     t.integer  "confidence_score",                         default: 0
     t.string   "external_link",                limit: 100
     t.integer  "geozone_id"
+    t.tsvector "tsv"
   end
 
   add_index "debates", ["author_id", "hidden_at"], name: "index_debates_on_author_id_and_hidden_at", using: :btree
@@ -134,6 +135,7 @@ ActiveRecord::Schema.define(version: 20160126090634) do
   add_index "debates", ["hidden_at"], name: "index_debates_on_hidden_at", using: :btree
   add_index "debates", ["hot_score"], name: "index_debates_on_hot_score", using: :btree
   add_index "debates", ["title"], name: "index_debates_on_title", using: :btree
+  add_index "debates", ["tsv"], name: "index_debates_on_tsv", using: :gin
 
   create_table "delayed_jobs", force: :cascade do |t|
     t.integer  "priority",   default: 0, null: false