AIOHTTP with Graphql: TypeError: __init__() got an unexpected keyword argument 'resolve'. Why this problem?

Question

我正在关注 GraphQL-core 3 文档。为什么会出现这个问题？

代码：

import asyncio
from graphql import (
    graphql, GraphQLSchema, GraphQLObjectType, GraphQLField, GraphQLString)


async def resolve_hello(obj, info):
    await asyncio.sleep(3)
    return 'world'

schema = GraphQLSchema(
    query=GraphQLObjectType(
        name='RootQueryType',
        fields={
            'hello': GraphQLField(
                GraphQLString,
                resolve=resolve_hello)
        }))


async def main():
    query = '{ hello }'
    print('Fetching the result...')
    result = await graphql(schema, query)
    print(result)


loop = asyncio.get_event_loop()
try:
    loop.run_until_complete(main())
finally:
    loop.close()

脚本运行后，终端returns出现如下错误

错误：

Traceback (most recent call last):
  File "server.py", line 16, in <module>
    resolve=resolve_hello)
TypeError: __init__() got an unexpected keyword argument 'resolve'

Answer 1

这是 graphql 版本的问题。例如，在版本 0.5.3 上，我遇到了与您相同的问题。

from graphql import (
    GraphQLSchema, GraphQLObjectType, GraphQLField, GraphQLString)

schema = GraphQLSchema(
    query=GraphQLObjectType(
        name='RootQueryType',
        fields={
            'hello': GraphQLField(
                GraphQLString,
                resolve=lambda obj, info: 'world')
        }))
>>> TypeError: __init__() got an unexpected keyword argument 'resolve'

刚刚更改为版本 3 或更高版本。

pip install "graphql-core>=3"