add trigram indexes for artists and pools

db/migrate/20160219010854_add_trigram_indexes_to_artists.rb

@@ -0,0 +1,13 @@
+class AddTrigramIndexesToArtists < ActiveRecord::Migration
+  def up
+    execute "create index index_artists_on_name_trgm on artists using gin (name gin_trgm_ops)"
+    execute "create index index_artists_on_group_name_trgm on artists using gin (group_name gin_trgm_ops)"
+    execute "create index index_artists_on_other_names_trgm on artists using gin (other_names gin_trgm_ops)"
+  end
+
+  def down
+    execute "drop index index_artists_on_other_names_trgm"
+    execute "drop index index_artists_on_group_name_trgm"
+    execute "drop index index_artists_on_name_trgm"
+  end
+end