How to use Schema's render_module?

[Anti-Distinctlyminty]

I am trying to use jsonref in place of the json module in a schema so that I can use json references. I have tested the jsonref module and it works just fine, however I am using it as follows in a schema

import jsonref

class BodySchema(Schema):
    class Meta:
        render_module = jsonref
        partial = True
        unknown = INCLUDE

...

# flask-smorest stuff
bp = Blueprint(...)

@bp.route("<int:model_id>/submit")
class ModelInstanceResource(MethodView):
    @bp.arguments(
        BodySchema,
        location="json",
        as_kwargs=True,
    )
    def post(self, **kwargs):
        pass

Unfortunately it just does not work, as $refs are not resolved.

Am I doing something wrong here?

[sloria]

sorry for the delay here. I don't see an issue with your code as is. @Anti-Distinctlyminty Can you be more specific about what the expected output vs actual output is?

[sloria]

i believe this is actually a flask-smorest issue. Schema.dump (not Schema.dumps) is being called when constructing a response here:

flask-smorest/src/flask_smorest/response.py

Line 103 in 3ec1ea6

result_dump = schema.dump(result_raw)

so render_module won't have any effect. the response will always be json

flask-smorest/src/flask_smorest/response.py

Lines 110 to 115 in 3ec1ea6

	resp = jsonify(self._prepare_response_content(result_dump))
	set_status_and_headers_in_response(resp, r_status_code, r_headers)
	if r_status_code is None:
	resp.status_code = status_code
	return resp

i think you can achieve your desired output using a post-dump method

import json

import jsonref

from marshmallow import INCLUDE, Schema, post_dump


class BodySchema(Schema):
    class Meta:
        render_module = jsonref
        unknown = INCLUDE

    @post_dump
    def jsonref(self, data, many, **kwargs):
        return json.load(jsonref.dumps(data))