Quart

Strawberry comes with a basic Quart integration. It provides a view that you can use to serve your GraphQL schema:

from quart import Quart
from strawberry.quart.views import GraphQLView

from api.schema import schema

app = Quart(__name__)

app.add_url_rule(
    "/graphql",
    view_func=GraphQLView.as_view("graphql_view", schema=schema),
)

if __name__ == "__main__":
    app.run()  

Options

The GraphQLView accepts the following options at the moment:

• schema : mandatory, the schema created by strawberry.Schema .
• graphql_ide : optional, defaults to "graphiql" , allows to choose the GraphQL IDE interface (one of graphiql , apollo-sandbox or pathfinder ) or to disable it by passing None .
• allow_queries_via_get : optional, defaults to True , whether to enable queries via GET requests
• multipart_uploads_enabled : optional, defaults to False , controls whether to enable multipart uploads. Please make sure to consider the security implications mentioned in the GraphQL Multipart Request Specification when enabling this feature.

Extending the view

We allow to extend the base GraphQLView , by overriding the following methods:

• get_context(self, request: Request, response: Response) -> Any
• get_root_value(self, request: Request) -> Any
• process_result(self, result: ExecutionResult) -> GraphQLHTTPResponse
• encode_json(self, response_data: GraphQLHTTPResponse) -> str

get_context

get_context allows to provide a custom context object that can be used in your resolver. You can return anything here, by default we return a dictionary with the request. By default; the Response object from Quart is injected via the parameters.

class MyGraphQLView(GraphQLView):
    async def get_context(self, request: Request, response: Response) -> Any:
        return {"example": 1}


@strawberry.type
class Query:
    @strawberry.field
    def example(self, info: strawberry.Info) -> str:
        return str(info.context["example"])  

Here we are returning a custom context dictionary that contains only one item called “example”.

Then we use the context in a resolver, the resolver will return “1” in this case.

get_root_value

get_root_value allows to provide a custom root value for your schema, this is probably not used a lot but it might be useful in certain situations.

Here’s an example:

class MyGraphQLView(GraphQLView):
    async def get_root_value(self, request: Request) -> Any:
        return Query(name="Patrick")


@strawberry.type
class Query:
    name: str  

Here we are returning a Query where the name is “Patrick”, so we when requesting the field name we’ll return “Patrick” in this case.

process_result

process_result allows to customize and/or process results before they are sent to the clients. This can be useful logging errors or hiding them (for example to hide internal exceptions).

It needs to return an object of GraphQLHTTPResponse and accepts the execution result.

from strawberry.http import GraphQLHTTPResponse
from strawberry.types import ExecutionResult


class MyGraphQLView(GraphQLView):
    async def process_result(self, result: ExecutionResult) -> GraphQLHTTPResponse:
        data: GraphQLHTTPResponse = {"data": result.data}

        if result.errors:
            data["errors"] = [err.formatted for err in result.errors]

        return data  

In this case we are doing the default processing of the result, but it can be tweaked based on your needs.

encode_json

encode_json allows to customize the encoding of the JSON response. By default we use json.dumps but you can override this method to use a different encoder.

class MyGraphQLView(GraphQLView):
    def encode_json(self, data: GraphQLHTTPResponse) -> str:
        return json.dumps(data, indent=2)