# Buggy code
def dispatch_request(self):
    if "text/html" in request.environ.get("HTTP_ACCEPT", ""):
        if not self.graphiql:
            abort(404)

        template = render_graphiql_page()
        return self.render_template(request, template=template)

    data = request.json

    try:
        query = data["query"]
        variables = data.get("variables")
        operation_name = data.get("operationName")

    except KeyError:
        return Response("No valid query was provided for the request", 400)

    context = dict(request=request)
    result = graphql_sync(
        self.schema,
        query,
        variable_values=variables,
        context_value=context,
        operation_name=operation_name,
    )

    response_data = {"data": result.data}

    if result.errors:
        response_data["errors"] = [format_graphql_error(err) for err in result.errors]

    return Response(
        json.dumps(response_data),
        status=400 if result.errors else 200,
        content_type="application/json",
    )


# Traceback (AttributeError)
Traceback (most recent call last):
File "/home/ignormies/.local/share/virtualenvs/gql-bf-XGX4szKA-py3.8/lib/python3.8/site-packages/graphql/type/definition.py", line 735, in fields
fields = resolve_thunk(self._fields)
File "/home/ignormies/.local/share/virtualenvs/gql-bf-XGX4szKA-py3.8/lib/python3.8/site-packages/graphql/type/definition.py", line 293, in resolve_thunk
return thunk() if callable(thunk) else thunk
File "/home/ignormies/.local/share/virtualenvs/gql-bf-XGX4szKA-py3.8/lib/python3.8/site-packages/strawberry/type.py", line 133, in <lambda>
lambda types_replacement_map=None: _get_fields(wrapped, types_replacement_map),
File "/home/ignormies/.local/share/virtualenvs/gql-bf-XGX4szKA-py3.8/lib/python3.8/site-packages/strawberry/type.py", line 76, in _get_fields
fields[field_name] = field(
File "/home/ignormies/.local/share/virtualenvs/gql-bf-XGX4szKA-py3.8/lib/python3.8/site-packages/strawberry/field.py", line 315, in field
return field(wrap)
File "/home/ignormies/.local/share/virtualenvs/gql-bf-XGX4szKA-py3.8/lib/python3.8/site-packages/strawberry/field.py", line 171, in __call__
setattr(wrap, IS_STRAWBERRY_FIELD, True)
AttributeError: 'method' object has no attribute '_is_strawberry_field'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/ignormies/.config/JetBrains/PyCharm2020.1/scratches/scratch_7.py", line 30, in <module>
schema = strawberry.Schema(query=Query)
File "/home/ignormies/.local/share/virtualenvs/gql-bf-XGX4szKA-py3.8/lib/python3.8/site-packages/strawberry/schema.py", line 25, in __init__
super().__init__(
File "/home/ignormies/.local/share/virtualenvs/gql-bf-XGX4szKA-py3.8/lib/python3.8/site-packages/graphql/type/schema.py", line 205, in __init__
collect_referenced_types(query)
File "/home/ignormies/.local/share/virtualenvs/gql-bf-XGX4szKA-py3.8/lib/python3.8/site-packages/graphql/type/schema.py", line 382, in collect_referenced_types
for field in named_type.fields.values():
File "/usr/lib/python3.8/functools.py", line 967, in __get__
val = self.func(instance)
File "/home/ignormies/.local/share/virtualenvs/gql-bf-XGX4szKA-py3.8/lib/python3.8/site-packages/graphql/type/definition.py", line 737, in fields
raise TypeError(f"{self.name} fields cannot be resolved. {error}")
TypeError: Query fields cannot be resolved. 'method' object has no attribute '_is_strawberry_field'

Process finished with exit code 1

# Fixed code
def dispatch_request(self):
    if "text/html" in request.environ.get("HTTP_ACCEPT", ""):
        if not self.graphiql:
            abort(404)

        template = render_graphiql_page()
        return self.render_template(request, template=template)

    data = request.json

    try:
        query = data["query"]
        variables = data.get("variables")
        operation_name = data.get("operationName")

    except KeyError:
        return Response("No valid query was provided for the request", 400)

    context = {"request": request}

    result = self.schema.execute_sync(
        query,
        variable_values=variables,
        context_value=context,
        operation_name=operation_name,
        root_value=self.root_value,
    )

    response_data = {"data": result.data}

    if result.errors:
        response_data["errors"] = [format_graphql_error(err) for err in result.errors]

    return Response(
        json.dumps(response_data),
        status=400 if result.errors else 200,
        content_type="application/json",
    )