Move auto_fields out of meta_

src/protean/adapters/repository/memory.py

@@ -17,7 +17,7 @@
 from protean.port.dao import BaseDAO, BaseLookup, ResultSet
 from protean.port.provider import BaseProvider
 from protean.utils import Database
-from protean.utils.container import id_field, attributes
+from protean.utils.container import auto_fields, id_field, attributes
 from protean.utils.query import Q
 
 # Global in-memory store of dict data. Keyed by name, to provide
@@ -258,7 +258,7 @@ def _set_auto_fields(self, model_obj):
         """Set the values of the auto field using counter"""
         conn = self._get_session()
 
-        for field_name in self.entity_cls.meta_.auto_fields:
+        for field_name in auto_fields(self.entity_cls):
             counter_key = f"{self.schema_name}_{field_name}"
             if not (field_name in model_obj and model_obj[field_name] is not None):
                 # Increment the counter and it should start from 1

src/protean/core/entity.py

@@ -208,14 +208,6 @@ def __init__(self, entity_name, meta):
         # Domain Attributes
         self.aggregate_cls = getattr(meta, "aggregate_cls", None)
 
-    @property
-    def auto_fields(self):
-        return {
-            field_name: field_obj
-            for field_name, field_obj in self.declared_fields.items()
-            if isinstance(field_obj, Auto)
-        }
-
 
 class _FieldsCacheDescriptor:
     def __get__(self, instance, cls=None):

src/protean/utils/container.py

@@ -5,6 +5,7 @@
 from collections import defaultdict
 
 from protean.core.field.base import Field, FieldBase
+from protean.core.field.basic import Auto
 from protean.exceptions import InvalidDataError, NotSupportedError, ValidationError
 
 logger = logging.getLogger("protean.domain")
@@ -75,6 +76,14 @@ def unique_fields(class_or_instance):
     }
 
 
+def auto_fields(class_or_instance):
+    return {
+        field_name: field_obj
+        for field_name, field_obj in fields(class_or_instance).items()
+        if isinstance(field_obj, Auto)
+    }
+
+
 class Element:
     """Base class for all Protean elements"""