[postgres] adapter was missing the custom rename_index method (fixes #577)

Author: kares

lib/arjdbc/postgresql/adapter.rb

@@ -1067,6 +1067,10 @@ def remove_index!(table_name, index_name)
       execute "DROP INDEX #{quote_table_name(index_name)}"
     end
 
+    def rename_index(table_name, old_name, new_name)
+      execute "ALTER INDEX #{quote_column_name(old_name)} RENAME TO #{quote_table_name(new_name)}"
+    end
+
     def index_name_length
       63
     end

test/db/postgresql/unit_test.rb

@@ -145,6 +145,11 @@ def test_add_index
     ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.send(:remove_method, :index_name_exists?) if redefined
   end if ar_version('4.0')
 
+  def test_rename_index
+    expected = "ALTER INDEX \"last_name_index\" RENAME TO \"name_index\""
+    assert_equal expected, rename_index(:people, :last_name_index, :name_index)
+  end # if ar_version('4.0')
+
   private
 
   def method_missing(method_symbol, *arguments)