[activerecord][postgresql] verify if table has a schema(not public)

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -659,7 +659,10 @@ module ActiveRecord
       # Returns the list of all tables in the schema search path or a specified schema.
       def tables(name = nil)
         query(<<-SQL, 'SCHEMA').map { |row| row[0] }
-          SELECT tablename
+          SELECT  case schemaname 
+                    when 'public' then tablename 
+                    else schemaname||'.'||tablename 
+                  end as tablename
           FROM pg_tables
           WHERE schemaname = ANY (current_schemas(false))
         SQL
@@ -830,11 +833,7 @@ module ActiveRecord
         end_sql
 
         # [primary_key, sequence]
-        if result.second ==  'public' then
-          sequence = result.last
-        else
-          sequence = result.second+'.'+result.last
-        end
+        sequence = result.second ==  'public' ?  result.last : "#{result.second}.#{result.last}"
         
         [result.first, sequence]
       rescue