trendingtechnology / flask-graphql

Adds GraphQL support to your Flask application.

Flask-GraphQL

Adds GraphQL support to your Flask application.

Usage

Just use the GraphQLView view from flask_graphql

from flask import Flask
from flask_graphql import GraphQLView

from schema import schema

app = Flask(__name__)

app.add_url_rule('/graphql', view_func=GraphQLView.as_view(
    'graphql',
    schema=schema,
    graphiql=True,
))

# Optional, for adding batch query support (used in Apollo-Client)
app.add_url_rule('/graphql/batch', view_func=GraphQLView.as_view(
    'graphql',
    schema=schema,
    batch=True
))

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

This will add /graphql endpoint to your app and enable the GraphiQL IDE.

Special Note for Graphene v3

If you are using the Schema type of Graphene library, be sure to use the graphql_schema attribute to pass as schema on the GraphQLView view. Otherwise, the GraphQLSchema from graphql-core is the way to go.

More info at Graphene v3 release notes and GraphQL-core 3 usage.

Supported options for GraphQLView

• schema: The GraphQLSchema object that you want the view to execute when it gets a valid request.
• context: A value to pass as the context_value to graphql execute function. By default is set to dict with request object at key request.
• root_value: The root_value you want to provide to graphql execute.
• pretty: Whether or not you want the response to be pretty printed JSON.
• graphiql: If True, may present GraphiQL when loaded directly from a browser (a useful tool for debugging and exploration).
• graphiql_version: The graphiql version to load. Defaults to "1.0.3".
• graphiql_template: Inject a Jinja template string to customize GraphiQL.
• graphiql_html_title: The graphiql title to display. Defaults to "GraphiQL".
• batch: Set the GraphQL view as batch (for using in Apollo-Client or ReactRelayNetworkLayer)
• middleware: A list of graphql middlewares.
• encode: the encoder to use for responses (sensibly defaults to graphql_server.json_encode).
• format_error: the error formatter to use for responses (sensibly defaults to graphql_server.default_format_error.
• subscriptions: The GraphiQL socket endpoint for using subscriptions in graphql-ws.
• headers: An optional GraphQL string to use as the initial displayed request headers, if not provided, the stored headers will be used.
• default_query: An optional GraphQL string to use when no query is provided and no stored query exists from a previous session. If not provided, GraphiQL will use its own default query.
• header_editor_enabled: An optional boolean which enables the header editor when true. Defaults to false.
• should_persist_headers: An optional boolean which enables to persist headers to storage when true. Defaults to false.

You can also subclass GraphQLView and overwrite get_root_value(self, request) to have a dynamic root value per request.

class UserRootValue(GraphQLView):
    def get_root_value(self, request):
        return request.user

Contributing

Since v3, flask-graphql code lives at graphql-server repository to keep any breaking change on the base package on sync with all other integrations. In order to contribute, please take a look at CONTRIBUTING.md.