Django

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

from django.urls import path

from strawberry.django.views import GraphQLView

from api.schema import schema
 
urlpatterns = [
    path("graphql/", GraphQLView.as_view(schema=schema)),
]

You'd also need to add strawberry.django to the INSTALLED_APPS of your project, this is needed to provide the template for the GraphiQL interface.

Options

The GraphQLView accepts the following arguments:

• schema: mandatory, the schema created by strawberry.Schema.
• graphiql: optional, defaults to True, whether to enable the GraphiQL interface.
• allow_queries_via_get: optional, defaults to True, whether to enable queries via GET requests
• subscriptions_enabled: optional boolean paramenter enabling subscriptions in the GraphiQL interface, defaults to False.

Deprecated options

The following options are deprecated and will be removed in a future release:

• json_encoder: optional JSON encoder, defaults to DjangoJSONEncoder, will be used to serialize the data.
• json_dumps_params: optional dictionary of keyword arguments to pass to the json.dumps call used to generate the response. To get the most compact JSON representation, you should specify {"separators": (",", ":")}, defaults to None.

You can extend the view and override encode_json to customize the JSON encoding process.

Extending the view

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

• get_context(self, request: HttpRequest, response: HttpResponse) -> Any
• get_root_value(self, request: HttpRequest) -> Any
• process_result(self, request: HttpRequest, result: ExecutionResult) -> GraphQLHTTPResponse

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 StrawberryDjangoContext object.

@strawberry.type
class Query:
    @strawberry.field
    def user(self, info: Info) -> str:
        return str(info.context.request.user)

or in case of a custom context:

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


@strawberry.type
class Query:
    @strawberry.field
    def example(self, info: 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):
    def get_root_value(self, request: HttpRequest) -> 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 request and the execution results.

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

from graphql.error.graphql_error import format_error as format_graphql_error

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

        if result.errors:
            data["errors"] = [format_graphql_error(err) 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.

Async Django

Strawberry also provides an async view that you can use with Django 3.1+

from django.urls import path

from strawberry.django.views import AsyncGraphQLView

from api.schema import schema
 
urlpatterns = [
    path("graphql/", AsyncGraphQLView.as_view(schema=schema)),
]

You'd also need to add strawberry.django to the INSTALLED_APPS of your project, this is needed to provide the template for the GraphiQL interface.

Options

The AsyncGraphQLView accepts the following arguments:

• schema: mandatory, the schema created by strawberry.Schema.
• graphiql: optional, defaults to True, whether to enable the GraphiQL interface.
• allow_queries_via_get: optional, defaults to True, whether to enable queries via GET requests
• subscriptions_enabled: optional boolean paramenter enabling subscriptions in the GraphiQL interface, defaults to False.

Extending the view

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

• async get_context(self, request: HttpRequest) -> Any
• async get_root_value(self, request: HttpRequest) -> Any
• async process_result(self, request: HttpRequest, result: ExecutionResult) -> GraphQLHTTPResponse
• def encode_json(self, 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.

class MyGraphQLView(AsyncGraphQLView):
    async def get_context(self, request: HttpRequest, response: HttpResponse) -> Any:
        return {"example": 1}


@strawberry.type
class Query:
    @strawberry.field
    def example(self, info: 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(AsyncGraphQLView):
    async def get_root_value(self, request: HttpRequest) -> 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 request and the execution results.

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

from graphql.error.graphql_error import format_error as format_graphql_error

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

        if result.errors:
            data["errors"] = [format_graphql_error(err) 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(AsyncGraphQLView):
    def encode_json(self, data: GraphQLHTTPResponse) -> str:
        return json.dumps(data, indent=2)

Subscriptions

Subscriptions run over websockets and thus depend on channels. Take a look at our channels integraton page for more information regarding it.

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