...

django_translatable_fields/models.py

@@ -0,0 +1,17 @@
+from django.db import models
+from .fields import TranslatableMixin
+from django.core.exceptions import ValidationError
+
+
+class TranslatableModelMixin(models.Model):
+    class Meta:
+        abstract = True
+
+    def clean(self):
+        for field in self._meta.get_fields():
+            if isinstance(field, TranslatableMixin) and field.translatable:
+                if not isinstance(getattr(self, field.name), dict):
+                    raise ValidationError(f'Field "{field.name}" must be a dictionary')
+                if not any(getattr(self, field.name).values()):
+                    raise ValidationError(f'Field "{field.name}" must contain at least one translation')
+        super().clean()