GraphQL

GraphQL

FastAPIでは、Strawberry GraphQLを使用してGraphQL APIを実装できます。

Strawberry GraphQLの設定

依存関係の追加

pip install strawberry-graphql[fastapi]

基本的な実装

import strawberry
from fastapi import FastAPI
from strawberry.fastapi import GraphQLRouter

@strawberry.type
class User:
    id: int
    name: str
    email: str

@strawberry.type
class Query:
    @strawberry.field
    def user(self, id: int) -> User:
        return User(id=id, name="John Doe", email="john@example.com")

schema = strawberry.Schema(Query)
graphql_app = GraphQLRouter(schema)

app = FastAPI()
app.include_router(graphql_app, prefix="/graphql")

ミューテーション

@strawberry.type
class Mutation:
    @strawberry.mutation
    def create_user(self, name: str, email: str) -> User:
        user = User(id=1, name=name, email=email)
        # データベースに保存
        return user

schema = strawberry.Schema(Query, Mutation)