Use join_info in a way that is compatible with Django 1 and 2

Author: Photonios

psqlextra/query.py

@@ -62,10 +62,10 @@ def add_join_conditions(self, conditions: Dict[str, Any]) -> None:
         for name, value in conditions.items():
             parts = name.split(LOOKUP_SEP)
             join_info = self.setup_joins(parts, opts, alias, allow_many=True)
-            self.trim_joins(join_info.targets, join_info.joins, join_info.path)
+            self.trim_joins(join_info[1], join_info[3], join_info[4])
 
-            target_table = join_info.joins[-1]
-            field = join_info.targets[-1]
+            target_table = join_info[3][-1]
+            field = join_info[1][-1]
             join = self.alias_map.get(target_table)
 
             if not join:
@@ -117,7 +117,7 @@ def add_fields(self, field_names: List[str], allow_m2m: bool=True) -> bool:
 
             join_info = self.setup_joins(parts, opts, alias, allow_many=allow_m2m)
             targets, final_alias, joins = self.trim_joins(
-                join_info.targets, join_info.joins, join_info.path
+                join_info[1], join_info[3], join_info[4]
             )
 
             for target in targets: