GraphQL Resolve Info

• You can access its type like this:

  import { GraphQLResolveInfo } from 'graphql';
  

• A key on the info object is either:

  • Field-specific:
    • The value for that key depends on the field.
    • fieldName, fieldNodes, path, rootType, and parentType.
  • Global:
    • The values for these keys won’t change, no matter which resolver we’re talking about.
    • schema, fragments, rootValue, operation and variableValues.

• fieldNodes:

  • Contains an excerpt of the query AST.
  • This excerpt starts at the current field (i.e. author) rather than at the root of the query (The entire query AST which starts at the root is stored in operation).
  It's value should be something similar to this:

    
    {
      "fieldNodes": [
        {
          "kind": "Field",
          "name": {
            "kind": "Name",
            "value": "author",
            "loc": { "start": 27, "end": 33 }
          },
          "arguments": [
            {
              "kind": "Argument",
              "name": {
                "kind": "Name",
                "value": "id",
                "loc": { "start": 34, "end": 36 }
              },
              "value": {
                "kind": "StringValue",
                "value": "user-1",
                "block": false,
                "loc": { "start": 38, "end": 46 }
              },
              "loc": { "start": 34, "end": 46 }
            }
          ],
          "directives": [],
          "selectionSet": {
            "kind": "SelectionSet",
            "selections": [
              {
                "kind": "Field",
                "name": {
                  "kind": "Name",
                  "value": "username",
                  "loc": { "start": 54, "end": 62 }
                },
                "arguments": [],
                "directives": [],
                "loc": { "start": 54, "end": 62 }
              },
              {
                "kind": "Field",
                "name": {
                  "kind": "Name",
                  "value": "posts",
                  "loc": { "start": 67, "end": 72 }
                },
                "arguments": [],
                "directives": [],
                "selectionSet": {
                  "kind": "SelectionSet",
                  "selections": [
                    {
                      "kind": "Field",
                      "name": {
                        "kind": "Name",
                        "value": "id",
                        "loc": { "start": 81, "end": 83 }
                      },
                      "arguments": [],
                      "directives": [],
                      "loc": { "start": 81, "end": 83 }
                    },
                    {
                      "kind": "Field",
                      "name": {
                        "kind": "Name",
                        "value": "title",
                        "loc": { "start": 90, "end": 95 }
                      },
                      "arguments": [],
                      "directives": [],
                      "loc": { "start": 90, "end": 95 }
                    }
                  ],
                  "loc": { "start": 73, "end": 101 }
                },
                "loc": { "start": 67, "end": 101 }
              }
            ],
            "loc": { "start": 48, "end": 105 }
          },
          "loc": { "start": 27, "end": 105 }
        }
      ]
    }
    
    

• path:

  GraphQL Query	path when resolving Post.title
  query AuthorWithPosts { author { posts { title } } }	{ "path": { "prev": { "prev": { "prev": { "key": "author" }, "key": "posts" }, "key": 0 }, "key": "title" } }

• operation:

  It's value should be something similar to this:

    
    {
      "operation": {
        "kind": "OperationDefinition",
        "operation": "query",
        "name": { "kind": "Name", "value": "AuthorWithPosts" },
        "selectionSet": {
          "kind": "SelectionSet",
          "selections": [
            {
              "kind": "Field",
              "name": { "kind": "Name", "value": "author" },
              "arguments": [
                {
                  "kind": "Argument",
                  "name": { "kind": "Name", "value": "id" },
                  "value": { "kind": "StringValue", "value": "user-1" }
                }
              ],
              "selectionSet": {
                "kind": "SelectionSet",
                "selections": [
                  {
                    "kind": "Field",
                    "name": { "kind": "Name", "value": "username" }
                  },
                  {
                    "kind": "Field",
                    "name": { "kind": "Name", "value": "posts" },
                    "selectionSet": {
                      "kind": "SelectionSet",
                      "selections": [
                        {
                          "kind": "Field",
                          "name": { "kind": "Name", "value": "id" }
                        },
                        {
                          "kind": "Field",
                          "name": { "kind": "Name", "value": "title" }
                        }
                      ]
                    }
                  }
                ]
              }
            }
          ]
        }
      }
    }
    
    

• variableValues:

  { "variableValues": { "userId": "user-1" } }