Support for non-scalar default values is broken

[patrick91]

thanks to @cache-missing for the report!

This:

import strawberry

@strawberry.input
class InputData:
    name: str = "10"

@strawberry.type
class Query:
    @strawberry.field
    def example(self, data: InputData = InputData()) -> str:
        return data.name

schema = strawberry.Schema(query=Query)

Results in an error when not passing anything to data:

argument of type 'InputData' is not iterable

GraphQL supports non scalar types as input (they also show up in the schema), while in python you'd usually use None/UNSET as default. We should support this use case, by either adding direct support for default values or by providing a default factory.

Here's an example on the playground

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[coady]

It can be done with an empty dict/object. The received value will still be the default input type.

    def example(self, data: InputData = {}) -> str:

[david-appliqloud]

It can be done with an empty dict/object. The received value will still be the default input type.

    def example(self, data: InputData = {}) -> str:

Thank you so much! I was running into this problem when testing and this solution worked wonders. I have no idea how the default value of {} converts to the input type but it does 👍