[ra-data-graphql-simple] Documented GraphQL Schema Type for `delete` mutation is incorrect

[kpollich]

What you were expecting:

The README for react-data-graphql-simple documents a deletePost mutation with the signature:

deletePost(id: ID!): Boolean

I expect to be able to implement this mutation for my resources in my GraphQL schema, and have react-admin run it correctly.

What happened instead:

react-admin is querying for an id field on the deleteState (State is my resource), which throws a GraphQL error since deleteState is set to return a Boolean.

Steps to reproduce:

Other information:

Environment

• React-admin version: 2.2.3

Error Payload:

{
  "errors": [
    {
      "message": "Field \"deleteState\" must not have a selection since type \"Boolean\" has no subfields.",
      "locations": [{ "line": 2, "column": 30 }],
      "extensions": {
        "code": "GRAPHQL_VALIDATION_FAILED",
        "exception": {
          "stacktrace": [
            "Field \"deleteState\" must not have a selection since type \"Boolean\" has no subfields.",
            "",
            "GraphQL request (2:30)",
            "1: mutation deleteState($id: ID!) {",
            "2:   data: deleteState(id: $id) {",
            "                                ^",
            "3:     id",
            "",
            "    at Object.Field (/Users/kyle_pollich/Workspace/work/artifex-press/replatform/artifex-press-api/node_modules/graphql/validation/rules/ScalarLeafs.js:50:33)",
            "    at Object.enter (/Users/kyle_pollich/Workspace/work/artifex-press/replatform/artifex-press-api/node_modules/graphql/language/visitor.js:343:29)",
            "    at Object.enter (/Users/kyle_pollich/Workspace/work/artifex-press/replatform/artifex-press-api/node_modules/graphql/language/visitor.js:394:25)",
            "    at visit (/Users/kyle_pollich/Workspace/work/artifex-press/replatform/artifex-press-api/node_modules/graphql/language/visitor.js:261:26)",
            "    at Object.validate (/Users/kyle_pollich/Workspace/work/artifex-press/replatform/artifex-press-api/node_modules/graphql/validation/validate.js:63:22)",
            "    at Promise.resolve.then (/Users/kyle_pollich/Workspace/work/artifex-press/replatform/artifex-press-api/node_modules/apollo-server-core/src/runQuery.ts:188:30)",
            "    at <anonymous>",
            "    at process._tickCallback (internal/process/next_tick.js:188:7)"
          ]
        }
      }
    }
  ]
}

[djhi]

Thanks for reporting. This looks like a good first issue to contribute