...

django_translatable_fields/fields.py

@@ -162,8 +162,10 @@ class TranslatableMixin:
         return json.dumps({current_lang: str(value)})
 
     def validate(self, value, model_instance):
-        if not self.translatable or not value or not isinstance(value, (str, dict)):
-            super().validate(value, model_instance)
+        if not self.translatable or not value:
+            return super().validate(value, model_instance)
+        if not isinstance(value, dict):
+            return super().validate(value, model_instance)
 
         # Validate each translation individually
         for lang_code, translation in value.items():

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()