如何在状态更改时刷新graphql数据

Question

import { useQuery, gql, useMutation } from "@apollo/client";

const Questions = () => {
const [modal, setModal] = useState(false)

const QUESTION_QUERIES = gql`
query getQuestions(
$subjectRef: ID
$gradeRef: ID
$chapterRef: ID
$status: String
) {
getQuestions(
subjectRef: $subjectRef
gradeRef: $gradeRef
chapterRef: $chapterRef
status: $status
) {
id
question_info
question_type
answer
level
published
subjectRef
gradeRef
chapterRef
levelRef
streamRef
curriculumRef
options
status
subject
grade
chapter
stream
curriculum
}
}
`;
const { loading, error, data } = useQuery(QUESTION_QUERIES);
return (
<div>
</div>
)
}

这是我的react graphql代码。如果模态状态从true变为false或从false变为false，我想在模态更改时使用state获取数据真的，它会调用api来再次获取问题

请看一下如何解决这个问题。

Answer 1

使用useLazyQuery:

CCD_ 2。

然后用modal作为依赖变量创建useEffect，并在useEffect中调用updateFn

Answer 2

您想在modal状态更改后获取数据，所以您只需使用useEffect并将modal放在useEffect的依赖列表中，对于useQuery，还有一个名为refetch的函数，逻辑如下

const { loading, error, data, refetch } = useQuery(QUESTION_QUERIES);
useEffect(() => {
// the reason I put if condition here is that this useEffect will
// also run after the first rendering screen so you need to put a check 
// to do not run refetch in that condition
if (data) refetch();
}, [modal]);