/home/uwe/projects/visual_analytics/backend/api/serializers.py: Error [EventViewSet > EventSerializer]: could not resolve model field "api.Event.time". Failed to resolve through serializer_field_mapping, get_internal_type(), or any override mechanism. Defaulting to "string"
Error might be related to the usage of postgres fields.
A fix by chatgpt could be:
The error you're encountering seems related to Django's Swagger documentation (such as drf-yasg or django-rest-swagger) not being able to correctly resolve or understand the DateTimeRangeField from PostgreSQL in your EventSerializer. Swagger has a hard time interpreting custom or less-common fields like PostgreSQL-specific fields such as DateTimeRangeField.
Here's how to address this issue:
Custom Field Mapping for Swagger
You can explicitly map the DateTimeRangeField to a Swagger-compatible type by overriding how Swagger represents this field. You can do this by defining a custom field in the serializer or by providing a manual mapping in the Swagger settings.
Option A: Override the Field in Serializer
If you're using DateTimeRangeField, you can represent it as a custom serializer field that translates it to something Swagger can understand, like two DateTimeFields for lower and upper.
python
from rest_framework import serializers
class EventSerializer(serializers.ModelSerializer):
start_time = serializers.DateTimeField(source='time.lower')
end_time = serializers.DateTimeField(source='time.upper')
class Meta:
model = Event
fields = ['start_time', 'end_time', ...] # Add other fields here
In this example, you’re splitting the DateTimeRangeField into two DateTimeFields, which Swagger will be able to represent correctly.
Option B: Override the Field in Swagger Settings
Alternatively, you can tell Swagger how to represent this field globally in your Swagger settings.
If you're using drf-yasg, you can add a mapping in your settings.py:
python
from drf_yasg import openapi
from drf_yasg.inspectors import FieldInspector
class CustomFieldInspector(FieldInspector):
def process_result(self, result, method_name, obj, **kwargs):
if result is not None:
return result
if isinstance(obj, YourDateTimeRangeField): # Replace with your field
return openapi.Schema(type=openapi.TYPE_OBJECT, properties={
'start': openapi.Schema(type=openapi.TYPE_STRING, format=openapi.FORMAT_DATETIME),
'end': openapi.Schema(type=openapi.TYPE_STRING, format=openapi.FORMAT_DATETIME)
})
return None
This will tell Swagger to treat your DateTimeRangeField as an object with two date-time fields: start and end.
Check drf-yasg Compatibility
If you're using drf-yasg, ensure that you're using a recent version that supports customization. If it still doesn't resolve the DateTimeRangeField properly, custom field mappings or overriding are required as explained above.
Testing the Fix
After applying one of the solutions above, restart your Django server and check the Swagger UI again. The DateTimeRangeField should now be correctly represented, and you should no longer see the string fallback or errors for that field.
Summary:
Option A: Override the DateTimeRangeField in the serializer to split it into two DateTimeFields.
Option B: Add a custom field inspector or field mapping for Swagger in your Django project settings.
Let me know if any of these solutions work or if you need further clarification!
/home/uwe/projects/visual_analytics/backend/api/serializers.py: Error [EventViewSet > EventSerializer]: could not resolve model field "api.Event.time". Failed to resolve through serializer_field_mapping, get_internal_type(), or any override mechanism. Defaulting to "string"Error might be related to the usage of postgres fields.
A fix by chatgpt could be:
The error you're encountering seems related to Django's Swagger documentation (such as drf-yasg or django-rest-swagger) not being able to correctly resolve or understand the DateTimeRangeField from PostgreSQL in your EventSerializer. Swagger has a hard time interpreting custom or less-common fields like PostgreSQL-specific fields such as DateTimeRangeField.
Here's how to address this issue:
You can explicitly map the DateTimeRangeField to a Swagger-compatible type by overriding how Swagger represents this field. You can do this by defining a custom field in the serializer or by providing a manual mapping in the Swagger settings. Option A: Override the Field in Serializer
If you're using DateTimeRangeField, you can represent it as a custom serializer field that translates it to something Swagger can understand, like two DateTimeFields for lower and upper.
python
from rest_framework import serializers
class EventSerializer(serializers.ModelSerializer): start_time = serializers.DateTimeField(source='time.lower') end_time = serializers.DateTimeField(source='time.upper')
In this example, you’re splitting the DateTimeRangeField into two DateTimeFields, which Swagger will be able to represent correctly. Option B: Override the Field in Swagger Settings
Alternatively, you can tell Swagger how to represent this field globally in your Swagger settings.
If you're using drf-yasg, you can add a mapping in your settings.py:
python
from drf_yasg import openapi from drf_yasg.inspectors import FieldInspector
Your custom mapping
FIELD_INSPECTORS = [ 'path.to.your.CustomFieldInspector', 'drf_yasg.inspectors.ModelFieldInspector', 'drf_yasg.inspectors.SimpleFieldInspector', ]
SWAGGER_SETTINGS = { 'DEFAULT_FIELD_INSPECTORS': FIELD_INSPECTORS,
other swagger settings
}
Then, create the custom field inspector:
python
from drf_yasg.inspectors import FieldInspector
class CustomFieldInspector(FieldInspector): def process_result(self, result, method_name, obj, **kwargs): if result is not None: return result
This will tell Swagger to treat your DateTimeRangeField as an object with two date-time fields: start and end.
If you're using drf-yasg, ensure that you're using a recent version that supports customization. If it still doesn't resolve the DateTimeRangeField properly, custom field mappings or overriding are required as explained above.
After applying one of the solutions above, restart your Django server and check the Swagger UI again. The DateTimeRangeField should now be correctly represented, and you should no longer see the string fallback or errors for that field. Summary:
Let me know if any of these solutions work or if you need further clarification!