Refs #29899 -- Moved resolve_relation() to django.db.migrations.utils.

django/db/migrations/operations/models.py

@@ -1,13 +1,14 @@
 from django.db import models
 from django.db.migrations.operations.base import Operation
 from django.db.migrations.state import ModelState
+from django.db.migrations.utils import resolve_relation
 from django.db.models.options import normalize_together
 from django.utils.functional import cached_property
 
 from .fields import (
     AddField, AlterField, FieldOperation, RemoveField, RenameField,
 )
-from .utils import field_references, get_references, resolve_relation
+from .utils import field_references, get_references
 
 
 def _check_for_duplicates(arg_name, objs):

django/db/migrations/operations/utils.py

@@ -1,34 +1,6 @@
 from collections import namedtuple
 
-from django.db.models.fields.related import RECURSIVE_RELATIONSHIP_CONSTANT
-
-
-def resolve_relation(model, app_label=None, model_name=None):
-    """
-    Turn a model class or model reference string and return a model tuple.
-
-    app_label and model_name are used to resolve the scope of recursive and
-    unscoped model relationship.
-    """
-    if isinstance(model, str):
-        if model == RECURSIVE_RELATIONSHIP_CONSTANT:
-            if app_label is None or model_name is None:
-                raise TypeError(
-                    'app_label and model_name must be provided to resolve '
-                    'recursive relationships.'
-                )
-            return app_label, model_name
-        if '.' in model:
-            app_label, model_name = model.split('.', 1)
-            return app_label, model_name.lower()
-        if app_label is None:
-            raise TypeError(
-                'app_label must be provided to resolve unscoped model '
-                'relationships.'
-            )
-        return app_label, model.lower()
-    return model._meta.app_label, model._meta.model_name
-
+from django.db.migrations.utils import resolve_relation
 
 FieldReference = namedtuple('FieldReference', 'to through')
 

django/db/migrations/utils.py

@@ -1,6 +1,8 @@
 import datetime
 import re
 
+from django.db.models.fields.related import RECURSIVE_RELATIONSHIP_CONSTANT
+
 COMPILED_REGEX_TYPE = type(re.compile(''))
 
 
@@ -15,3 +17,30 @@ class RegexObject:
 
 def get_migration_name_timestamp():
     return datetime.datetime.now().strftime("%Y%m%d_%H%M")
+
+
+def resolve_relation(model, app_label=None, model_name=None):
+    """
+    Turn a model class or model reference string and return a model tuple.
+
+    app_label and model_name are used to resolve the scope of recursive and
+    unscoped model relationship.
+    """
+    if isinstance(model, str):
+        if model == RECURSIVE_RELATIONSHIP_CONSTANT:
+            if app_label is None or model_name is None:
+                raise TypeError(
+                    'app_label and model_name must be provided to resolve '
+                    'recursive relationships.'
+                )
+            return app_label, model_name
+        if '.' in model:
+            app_label, model_name = model.split('.', 1)
+            return app_label, model_name.lower()
+        if app_label is None:
+            raise TypeError(
+                'app_label must be provided to resolve unscoped model '
+                'relationships.'
+            )
+        return app_label, model.lower()
+    return model._meta.app_label, model._meta.model_name