python - Sending file with Flask test client raises "FileStorage is not JSON serializable" -


i testing sending files flask route. however, error typeerror: <filestorage: 'test_photo.jpg' ('image/jpeg')> not json serializable. looking through route, '/new-ad/write-details, there nothing attempting json serialize field.

video_file = open(test_helpers.get_dummy_file('test_video.mp4'), 'rb') image_file = open(test_helpers.get_dummy_file('test_photo.jpg'), 'rb') response = self.app.post(     '/new-ad/write-details',     buffered=true,     content_type='multipart/form-data',     data={         'location_id': db.session.query(location).first().id,         'category_id': db.session.query(category).first().id,         'title': 'test title',         'body': 'test body',         'add_video': (video_file, 'test_video.mp4'),         'add_images': (image_file, 'test_photo.jpg')}) assert response.status_code == 302 assert response.location.partition('?')[0] == 'http://localhost/new-ad/preview' ad_id = response.location.partition('?')[2].partition('=')[2] video_file.close() image_file.close() 
traceback (most recent call last):   file "tests.py", line 144, in test_ads_creation_routes     'add_images': (image_file, 'test_photo.jpg')})   file "/home/dev/projects/ggp/lib/python3.5/site-packages/werkzeug/test.py", line 801, in post     return self.open(*args, **kw)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/testing.py", line 127, in open     follow_redirects=follow_redirects)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/werkzeug/test.py", line 764, in open     response = self.run_wsgi_app(environ, buffered=buffered)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/werkzeug/test.py", line 677, in run_wsgi_app     rv = run_wsgi_app(self.application, environ, buffered=buffered)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/werkzeug/test.py", line 884, in run_wsgi_app     app_rv = app(environ, start_response)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/app.py", line 1997, in __call__     return self.wsgi_app(environ, start_response)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/app.py", line 1985, in wsgi_app     response = self.handle_exception(e)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/app.py", line 1540, in handle_exception     reraise(exc_type, exc_value, tb)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise     raise value   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/app.py", line 1982, in wsgi_app     response = self.full_dispatch_request()   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/app.py", line 1615, in full_dispatch_request     return self.finalize_request(rv)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/app.py", line 1632, in finalize_request     response = self.process_response(response)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/app.py", line 1858, in process_response     self.save_session(ctx.session, response)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/app.py", line 924, in save_session     return self.session_interface.save_session(self, session, response)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/sessions.py", line 363, in save_session     val = self.get_signing_serializer(app).dumps(dict(session))   file "/home/dev/projects/ggp/lib/python3.5/site-packages/itsdangerous.py", line 565, in dumps     payload = want_bytes(self.dump_payload(obj))   file "/home/dev/projects/ggp/lib/python3.5/site-packages/itsdangerous.py", line 847, in dump_payload     json = super(urlsafeserializermixin, self).dump_payload(obj)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/itsdangerous.py", line 550, in dump_payload     return want_bytes(self.serializer.dumps(obj))   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/sessions.py", line 85, in dumps     return json.dumps(_tag(value), separators=(',', ':'))   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/json.py", line 123, in dumps     rv = _json.dumps(obj, **kwargs)   file "/usr/lib/python3.5/json/__init__.py", line 237, in dumps     **kw).encode(obj)   file "/usr/lib/python3.5/json/encoder.py", line 198, in encode     chunks = self.iterencode(o, _one_shot=true)   file "/usr/lib/python3.5/json/encoder.py", line 256, in iterencode     return _iterencode(o, 0)   file "/home/dev/projects/ggp/lib/python3.5/site-packages/flask/json.py", line 80, in default     return _json.jsonencoder.default(self, o)   file "/usr/lib/python3.5/json/encoder.py", line 179, in default     raise typeerror(repr(o) + " not json serializable") typeerror: <filestorage: 'test_photo.jpg' ('image/jpeg')> not json serializable

the code you've shown works, , not related error you've shown. error indicates you're trying add file object session. bad idea.

the session cookie, not limited in size sent server every request client makes. adding whole file increases network traffic no reason.

if need file in session, or in json response, add reference path on disk, not data itself. when need file make request serve file separately. web servers @ serving files.

return jsonify({'video': '/path/to/video.mp4'})

if, reason, really need add file data json payload (but really, don't), serialize using base64 first. inefficient in space , time, consider last resort only.

from base64 import b64encode return jsonify({'video': b64encode(video.read())})

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