refactor(base): model instancxe code de-duplicated

ref: #804

app/centurion/tests/unit_models.py

@@ -92,7 +92,7 @@ class ModelTestCases(
 
 
     @pytest.fixture( scope = 'function', autouse = True)
-    def model_instance(cls, request, model, model_kwargs):
+    def model_instance(cls, model_kwarg_data, model, model_kwargs):
 
         class MockModel(model):
             class Meta:
@@ -110,52 +110,24 @@ class ModelTestCases(
 
         else:
 
-
-            kwargs = {}
-
-            many_field = {}
-
-            for field, value in model_kwargs.items():
-
-                if isinstance(getattr(model, field).field, models.ManyToManyField):
-
-                    if field in many_field:
-
-                        many_field[field] += [ value ]
-
-                    else:
-
-                        many_field.update({
-                            field: [
-                                value
-                            ]
-                        })
-
-                    continue
-
-                kwargs.update({
-                    field: value
-                })
-
-            instance = model.objects.create( **kwargs )
+            instance = model_kwarg_data(
+                model = model,
+                model_kwargs = model_kwargs,
+                create_instance = True,
+            )
 
 
-
-            for field, values in many_field.items():
-
-                for value in values:
-
-                    getattr(instance, field).add( value )
-
-
-
-        yield instance
+        yield instance['instance']
 
         if 'mockmodel' in apps.all_models['core']:
 
             del apps.all_models['core']['mockmodel']
 
-        if instance.id and type(instance) is not MockModel:
+        if type(instance) is dict:
+
+            instance['instance'].delete()
+
+        elif instance.id and type(instance) is not MockModel:
 
             instance.delete()