buildMutation not working properly

I’m trying to use buildMutation, and it doesn’t seem to be working correctly. I’m also confused by the discrepancy between docs and source.

The Amplify API docs say to do this:

  const result = await client.mutate(buildMutation(client,
    gql(createStudent),
    {
      inputType: gql(CreateStudentInput),
      variables
    },
    (_variables) => [ gql(listStudents) ],
    'Student'
  ));

but by looking at the source code it looks like I should do this:

  const result = await client.mutate(buildMutation(
      client,
      gql(createStudent),
      variables,
      gql(listStudents),
      'Student'
  ))

Here’s what happens using the second code sample

1. I initiate create on a Student named ‘Bob’

2. (In another component) The listStudents query returns an empty data.listStudents while the mutation is in flight.

3. Once the server returns success, then listStudents returns a full data.listStudents including the new record.

4. Console shows a bunch of errors like

 Missing field bookMaps in {
  "__typename": "Student",
  "id": "30128546-4592-4833-852f-1bdddba858ce",
  "firstName": "Bob"

My `createStudent` mutation

export const createStudent = `mutation CreateStudent($input: CreateStudentInput!) {
  createStudent(input: $input) {
    id
    firstName
    lastName
    birthdate
    curriculumMaps {
      items {
        id
      }
      nextToken
    }
    bookMaps {
      items {
        id
      }
      nextToken
    }
    resourceMaps {
      items {
        id
      }
      nextToken
    }
    summaryMaps {
      items {
        id
      }
      nextToken
    }
  }
}`

My `listStudents` query

export const listStudents = `query ListStudents(
  $filter: ModelStudentFilterInput
  $limit: Int
  $nextToken: String
) {
  listStudents(filter: $filter, limit: $limit, nextToken: $nextToken) {
    items {
      id
      firstName
      lastName
      birthdate
      curriculumMaps {
        nextToken
      }
      bookMaps {
        nextToken
      }
      resourceMaps {
        nextToken
      }
      summaryMaps {
        nextToken
      }
    }
    nextToken
  }
}
`

Versions

"aws-appsync": "1.7.1",
"aws-appsync-react": "1.2.6",

[santi8194]

Any update here? It’s been a year and a half since this issue has any comments. And today, I’m having the same problems, the documentation is the same and I can’t find any solution.

[flybayer]

Update: buildMutation is never updating the cache, even after a successful API response. I thought this was working earlier, but I forgot to comment out my refetch() while testing this.