feat: code refactoring and bug fixing (#29)

* fix: typo in docstring

* refactor: deletion of an unnecessary variable

* refactor: DRY principle and correction E712

* refactor: Adding a check for the presence of created policies and a small code reduction

* fix: correcting the variable - rows_created

casbin_adapter/adapter.py

@@ -53,8 +53,8 @@ def save_policy(self, model):
             for ptype, ast in model.model[sec].items():
                 for rule in ast.policy:
                     lines.append(self._create_policy_line(ptype, rule))
-        CasbinRule.objects.using(self.db_alias).bulk_create(lines)
-        return True
+        rows_created = CasbinRule.objects.using(self.db_alias).bulk_create(lines)
+        return len(rows_created) > 0
 
     def add_policy(self, sec, ptype, rule):
         """adds a policy rule to the storage."""
@@ -67,7 +67,7 @@ def remove_policy(self, sec, ptype, rule):
         for i, v in enumerate(rule):
             query_params["v{}".format(i)] = v
         rows_deleted, _ = CasbinRule.objects.using(self.db_alias).filter(**query_params).delete()
-        return True if rows_deleted > 0 else False
+        return rows_deleted > 0
 
     def remove_filtered_policy(self, sec, ptype, field_index, *field_values):
         """removes policy rules that match the filter from the storage.
@@ -81,4 +81,4 @@ def remove_filtered_policy(self, sec, ptype, field_index, *field_values):
         for i, v in enumerate(field_values):
             query_params["v{}".format(i + field_index)] = v
         rows_deleted, _ = CasbinRule.objects.using(self.db_alias).filter(**query_params).delete()
-        return True if rows_deleted > 0 else False
+        return rows_deleted > 0

casbin_adapter/enforcer.py

@@ -21,7 +21,7 @@ def __init__(self, *args, **kwargs):
             logger.info("Deferring casbin enforcer initialisation until django is ready")
 
     def _load(self):
-        if self._initialized == False:
+        if self._initialized is False:
             logger.info("Performing deferred casbin enforcer initialisation")
             self._initialized = True
             model = getattr(settings, "CASBIN_MODEL")
@@ -63,24 +63,15 @@ def __getattribute__(self, name):
 def initialize_enforcer(db_alias=None):
     try:
         row = None
-        if db_alias:
-            with connections[db_alias].cursor() as cursor:
-                cursor.execute(
-                    """
-                    SELECT app, name applied FROM django_migrations
-                    WHERE app = 'casbin_adapter' AND name = '0001_initial';
-                    """
-                )
-                row = cursor.fetchone()
-        else:
-            with connection.cursor() as cursor:
-                cursor.execute(
-                    """
-                    SELECT app, name applied FROM django_migrations
-                    WHERE app = 'casbin_adapter' AND name = '0001_initial';
-                    """
-                )
-                row = cursor.fetchone()
+        connect = connections[db_alias] if db_alias else connection
+        with connect.cursor() as cursor:
+            cursor.execute(
+                """
+                SELECT app, name applied FROM django_migrations
+                WHERE app = 'casbin_adapter' AND name = '0001_initial';
+                """
+            )
+            row = cursor.fetchone()
 
         if row:
             enforcer._load()

casbin_adapter/utils.py

@@ -3,10 +3,9 @@
 
 def import_class(name):
     """Import class from string
-    e.g. `package.module.ClassToImport` returns the `ClasToImport` class"""
+    e.g. `package.module.ClassToImport` returns the `ClassToImport` class"""
     components = name.split(".")
     module_name = ".".join(components[:-1])
     class_name = components[-1]
     module = importlib.import_module(module_name)
-    class_ = getattr(module, class_name)
-    return class_
+    return getattr(module, class_name)