ConditionalConcurrencyField can be used without having ConcurrencyMeta defiend.

src/concurrency/fields.py

@@ -333,7 +333,9 @@ def _get_hash(self, instance):
         check_fields = instance._concurrencymeta.check_fields
         ignore_fields = instance._concurrencymeta.ignore_fields
 
-        if check_fields is None:
+        if check_fields is None and ignore_fields is None:
+            fields = sorted([f.name for f in instance._meta.get_fields()])
+        elif check_fields is None:
             fields = sorted([f.name for f in instance._meta.get_fields()
                              if f.name not in ignore_fields])
         else:

tests/demoapp/demo/migrations/0002_conditionalversionmodelwithoutmeta.py

@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+from django.conf import settings
+import concurrency.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('demo', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ConditionalVersionModelWithoutMeta',
+            fields=[
+                ('id', models.AutoField(auto_created=True, verbose_name='ID', serialize=False, primary_key=True)),
+                ('version', concurrency.fields.ConditionalVersionField(default=1, help_text='record revision number')),
+                ('field1', models.CharField(unique=True, blank=True, max_length=30, null=True)),
+                ('field2', models.CharField(unique=True, blank=True, max_length=30, null=True)),
+                ('field3', models.CharField(unique=True, blank=True, max_length=30, null=True)),
+                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL, null=True)),
+            ],
+        ),
+    ]

tests/demoapp/demo/models.py

@@ -11,6 +11,7 @@
 __all__ = ['SimpleConcurrentModel', 'AutoIncConcurrentModel',
            'ProxyModel', 'InheritedModel', 'CustomSaveModel',
            'ConcreteModel', 'TriggerConcurrentModel',
+           'ConditionalVersionModelWithoutMeta',
            ]
 
 
@@ -210,3 +211,17 @@ class Meta:
 
     class ConcurrencyMeta:
         check_fields = ['field1', 'field2', 'user']
+
+
+class ConditionalVersionModelWithoutMeta(models.Model):
+    """
+    This model doesn't have ConcurrencyMeta defined.
+    """
+    version = ConditionalVersionField()
+    field1 = models.CharField(max_length=30, blank=True, null=True, unique=True)
+    field2 = models.CharField(max_length=30, blank=True, null=True, unique=True)
+    field3 = models.CharField(max_length=30, blank=True, null=True, unique=True)
+    user = models.ForeignKey(User, null=True)
+
+    class Meta:
+        app_label = 'demo'

tests/demoapp/demo/settings.py

@@ -117,4 +117,6 @@
 else:
     DATABASES = {
         'default': {
-            'ENGINE': 'django.db.backends.sqlite3'}}
+            'ENGINE': 'django.db.backends.sqlite3',
+            'NAME': dbname,
+        }}

tests/test_conditional.py

@@ -8,7 +8,10 @@
 
 from concurrency.exceptions import RecordModifiedError
 from concurrency.utils import refetch
-from demo.models import ConditionalVersionModel
+from demo.models import (
+    ConditionalVersionModel,
+    ConditionalVersionModelWithoutMeta,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -25,6 +28,15 @@ def instance(user):
                                                          field2='1', field3='1')[0]
 
 
+@pytest.fixture
+def instance_no_meta(user):
+    return ConditionalVersionModelWithoutMeta.objects.create(
+        field1='1',
+        user=user,
+        field2='1', field3='1'
+    )
+
+
 @pytest.mark.django_db
 def test_standard_save(instance):
     # only increment if checked field
@@ -74,3 +86,17 @@ def test_save_allowed(instance):
     batch_instance.field3 = 'aaaa'
     batch_instance.save()
     instance.save()
+
+
+@pytest.mark.django_db(transaction=True)
+def test_conflict_no_meta(instance_no_meta):
+    # Scenario: batch change any field,
+    # the user is NOT ALLOWED to save
+    batch_instance = instance_no_meta.__class__.objects.get(pk=instance_no_meta.pk)
+    assert batch_instance.version == instance_no_meta.version
+
+    batch_instance.field1 = 'aaaa'
+    batch_instance.save()
+
+    with pytest.raises(RecordModifiedError):
+        instance_no_meta.save()