Support GeneratedField

[MaHryCT3]

We have SimpleMetadata and a get_field_info method that retrieves the field type using the label_lookup dictionary. But the new field is GeneratedField, inherited from Field so it is defined as ModelField and in the schema the field is called 'field', but actually we have GeneratedField(output_field=...) which labels the data type. Is there any support for this planned?

[MaHryCT3]

I guess the problem goes a little earlier that build_standard_field has to recognize this field

[auvipy]

DRF plans to support new features of Django and Python new releases. so POC in welcome

[violuke]

Here's a snippet that seems to be doing the trick for me by overriding the build_standard_field() function in serializers.ModelSerializer.

    # Breww has overwritten this function to handle Generated fields - see https://github.com/encode/django-rest-framework/discussions/9494
    def build_standard_field(self, field_name, model_field):
        """
        Create regular model fields.
        """
        field_mapping = ClassLookupDict(self.serializer_field_mapping)

        # If this is a GeneratedField, convert it first to its output_field as this is how it should be treated
        if isinstance(model_field, GeneratedField):
            model_field = model_field.output_field

        field_class = field_mapping[model_field]
        field_kwargs = get_field_kwargs(field_name, model_field)

        # Special case to handle when a OneToOneField is also the primary key
        if model_field.one_to_one and model_field.primary_key:
            field_class = self.serializer_related_field
            field_kwargs['queryset'] = model_field.related_model.objects

        # ...rest of the function here

The only part needed is the block:

        # If this is a GeneratedField, convert it first to its output_field as this is how it should be treated
        if isinstance(model_field, GeneratedField):
            model_field = model_field.output_field