I'm working with Flask-Marshmallow
for validating request
and response
schemas in Flask app
. I was able to do simple validations for request.form
and request.args
when there are simple fields like Int
, Str
, Float
etc.
I have a case where I need to upload a file using a form field - file_field
. It should contain the file content.
How can I validate if this field is present or not and what is the format of file etc.
Is there any such field in Marshmallow
that I can use like fields.Int()
or fields.Str()
I have gone through the documentation here but haven't found any such field.
You can use fields.Raw
:
import marshmallow
class CustomSchema(marshmallow.Schema):
file = marshmallow.fields.Raw(type='file')
If you are using Swagger, you would then see something like this:
Then in your view
you can access the file content with flask.request.files
.
For a full example and more advanced topics, check out my project.