Support for Optional values

[sammyrulez]

How could I define a field that is optional / not required ?

[GabrielCappelli]

If it's a query arg it must have a default value to be optional.

@app.route('/')
def my_route(required: str, optinal: str = None):
    return ""

For Marshmallow it defaults to optional for all fields, you need to specifically set them as required:

class MarshmallowModelSchema(Schema):
    str_field = fields.Str(required=True)
    int_field = fields.Int(required=False)
    float_field = fields.Float()

[sammyrulez]

It would be nice to be able to use plain Optional types. May I submit a PR for that?

[GabrielCappelli]

Do you mean using typing.Optional ?

If so we can use it, but I think the user will still have to set a default, otherwise the function will fail when being called without that parameter.

@app.route('/')
def my_route(required: str, optinal: Optional[str] = None):
    return ""

Sure, you can go ahead with a PR.

[sammyrulez]

O course, but I think is more useful for typing fields

class Person:
        name:str
       age: int
       religion:Optional[str]

[GabrielCappelli]

Ahh sure, so for dataclasses...

I believe there would be two changes required to support this:

We would have to change this for to filter out all Optional[] fields.

And this function to be able to handle Optional[T] and figure out the type of T.