composite key is map

Author: awreece

lib/mosql/schema.rb

@@ -434,7 +434,7 @@ def collections_for_mongo_db(db)
     def primary_sql_keys_for_schema(schema)
       keys = []
       if schema[:meta][:composite_key]
-        keys = schema[:meta][:composite_key]
+        keys = schema[:meta][:composite_key].map{ |k| k.to_sym }
       else
         keys << schema[:columns].find {|c| c[:source] == '_id'}[:name]
       end