Dependent (or serial) queries depend on previous ones to finish before they can execute. To achieve this, it's as easy as using the enabled option to tell a query when it is ready to run:
// Get the user
const { data: user } = useQuery(['user', email], getUserByEmail)
const userId = user?.id
// Then get the user's projects
const { isIdle, data: projects } = useQuery(
['projects', userId],
getProjectsByUser,
{
// The query will not execute until the userId exists
enabled: !!userId,
}
)
// isIdle will be `true` until `enabled` is true and the query begins to fetch.
// It will then go to the `isLoading` stage and hopefully the `isSuccess` stage :)
// Get the user
const { data: user } = useQuery(['user', email], getUserByEmail)
const userId = user?.id
// Then get the user's projects
const { isIdle, data: projects } = useQuery(
['projects', userId],
getProjectsByUser,
{
// The query will not execute until the userId exists
enabled: !!userId,
}
)
// isIdle will be `true` until `enabled` is true and the query begins to fetch.
// It will then go to the `isLoading` stage and hopefully the `isSuccess` stage :)
“This course is the best way to learn how to use React Query in real-world applications.”—Tanner LinsleyCheck it out