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from dataclasses import dataclass
from datetime import date, datetime
from typing import Collection
from uuid import UUID, uuid4
from graphql import graphql_sync, print_schema
from apischema.graphql import graphql_schema, resolver
@dataclass
class User:
id: UUID
username: str
birthday: date | None = None
@resolver
def posts(self) -> Collection["Post"]:
return [post for post in POSTS if post.author.id == self.id]
@dataclass
class Post:
id: UUID
author: User
date: datetime
content: str
USERS = [User(uuid4(), "foo"), User(uuid4(), "bar")]
POSTS = [Post(uuid4(), USERS[0], datetime.now(), "Hello world!")]
def users() -> Collection[User]:
return USERS
def posts() -> Collection[Post]:
return POSTS
def user(username: str) -> User | None:
for user in users():
if user.username == username:
return user
else:
return None
schema = graphql_schema(query=[users, user, posts], id_types={UUID})
schema_str = """\
type Query {
users: [User!]!
user(username: String!): User
posts: [Post!]!
}
type User {
id: ID!
username: String!
birthday: Date
posts: [Post!]!
}
scalar Date
type Post {
id: ID!
author: User!
date: Datetime!
content: String!
}
scalar Datetime"""
assert print_schema(schema) == schema_str
query = """
{
users {
username
posts {
content
}
}
}"""
assert graphql_sync(schema, query).data == {
"users": [
{"username": "foo", "posts": [{"content": "Hello world!"}]},
{"username": "bar", "posts": []},
]
}
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