uses tsvector column to search

app/models/proposal.rb

@@ -28,6 +28,7 @@ class Proposal < ActiveRecord::Base
   validates :terms_of_service, acceptance: { allow_nil: false }, on: :create
 
   before_validation :set_responsible_name
+  before_validation :calculate_tsvector
 
   before_save :calculate_hot_score, :calculate_confidence_score
 
@@ -50,13 +51,26 @@ class Proposal < ActiveRecord::Base
       tags: :name
     },
     using: {
-      tsearch: { dictionary: "spanish" },
+      tsearch: { dictionary: "spanish", tsvector_column: 'tsv' },
       trigram: { threshold: 0.1 },
     },
     ranked_by: '(:tsearch + proposals.cached_votes_up)',
     order_within_rank: "proposals.created_at DESC"
   }
 
+  #remember to add tags.name
+  def searchable_fields
+    %w(title question summary description)
+  end
+
+  def searchable_fields_to_sql
+    searchable_fields.collect { |field| "coalesce(#{field},'')" }.join(" || ' ' || ")
+  end
+
+  def calculate_tsvector
+    ActiveRecord::Base.connection.execute("UPDATE proposals SET tsv = (to_tsvector('spanish', #{searchable_fields_to_sql})) WHERE id = #{self.id}")
+  end
+
   def description
     super.try :html_safe
   end

db/migrate/20151111202657_adds_tsvector_update_trigger.rb

@@ -0,0 +1,13 @@
+class AddsTsvectorUpdateTrigger < ActiveRecord::Migration
+
+  def up
+    add_column :proposals, :tsv, :tsvector
+    add_index :products, :tsv, using: "gin"
+  end
+
+  def down
+    remove_index :products, :tsv
+    remove_column :proposals, :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: 20151103194329) do
+ActiveRecord::Schema.define(version: 20151111202657) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -215,6 +215,7 @@ ActiveRecord::Schema.define(version: 20151103194329) do
     t.text     "summary"
     t.string   "video_url"
     t.integer  "physical_votes",               default: 0
+    t.tsvector "tsv"
   end
 
   add_index "proposals", ["author_id", "hidden_at"], name: "index_proposals_on_author_id_and_hidden_at", using: :btree
@@ -227,6 +228,7 @@ ActiveRecord::Schema.define(version: 20151103194329) do
   add_index "proposals", ["question"], name: "index_proposals_on_question", using: :btree
   add_index "proposals", ["summary"], name: "index_proposals_on_summary", using: :btree
   add_index "proposals", ["title"], name: "index_proposals_on_title", using: :btree
+  add_index "proposals", ["tsv"], name: "index_proposals_on_tsv", using: :gin
 
   create_table "settings", force: :cascade do |t|
     t.string "key"