GraphQL Apollo：在 apollo 客户端查询中未提供变量错误，尽管我认为我设置了变量

Question

What is wrong with this basic apolloClient query?

import gql from 'graphql-tag'

export default (context, apolloClient, userId) => (
  apolloClient.query({
    query: gql`
      query RootQueryType($userId: ID!) {
        verifyUser(
          id: $userId
        ) {
          id,
          token
        }
      },
    `,
    options: {
      variables: { userId: userId }
    }
  }).then(({ data }) => {
    return { loggedInUser: data }
  }).catch((error) => {
    console.log(error)
    return { loggedInUser: {} }
  })
)

I do get the error Error: GraphQL error: Variable "$userId" of required type "ID." was not provided. Error: GraphQL error: Variable "$userId" of required type "ID." was not provided. . But I set the options and variables with this data. I don't see, what I am doing wrong.

Answer 1

The first userID should be id instead of userID , it should also be defined as id in the Apollo server to match your query..

Change:

 options: { variables: { userId: userId } } 

To:

options: {
  variables: { id: userId }
}

Answer 2

I think you have the problem in the query definition:

 gql ` query RootQueryType($userId: ID!) { verifyUser( userId: $userId // here you need the parameter to be userId ) { id, token } }` 

Answer 3

I came across this issue. Make sure your variable is

• string "userId": "1" not number "userId": 1
• without $ sign "userId": "1" not "$userId": "1" also not userId

I was setting as $userId: 1 but correct one was "userId": "1"