Mock object with [String: AnyHashable] data doesn't compile

[Cookiezby]

Summary

In the official site, the mock object can be initialized with DataDict type which receive data with type [String: AnyHashable], but it will throw compile error

Cannot convert value of type '[String : Any]' to expected dictionary value type 'String'

Version

1.6.1

Steps to reproduce the behavior

It is not related to specific version of Apollo, but maybe related to Swift language, I am testing with Swift 5.9, the snippet from documentation site can not compile correctly

let data: [String: AnyHashable] = [
    "data": [
        "__typename": "Query",
        "hero": [
            "__typename": "Human",
            "id": "123",
            "name": "Obi-wan Kenobi",
            "friends": [
                [
                    "__typename": "Human",
                    "id": "456",
                    "name": "Padme Amidala"
                ],
                [
                    "__typename": "Droid",
                    "id": "789",
                    "name": "C-3PO"
                ]
            ]
        ]
    ]
]

the error says Cannot convert value of type '[String : Any]' to expected dictionary value type 'String'

If you change the type from [String: AnyHashable] to [String: Any] , it won't throw any issue, but the DataDict can not receive [String: Any]

Logs

No response

Anything else?

No response

[Cookiezby]

This issue is also related to this problem #3179

[Cookiezby]

I found out it needs to define every nested dictionary as [String: AnyHashable] so that the data can be [String: AnyHashable]

let frind: [String: AnyHashable] =  [
    "__typename": "Human",
    "id": "456",
    "name": "Padme Amidala"
]

let hero: [String: AnyHashable] = [
    "__typename": "Human",
    "id": "123",
    "name": "Obi-wan Kenobi",
    "friends": [
        frind
    ]
]

let query: [String: AnyHashable] = [
    "__typename": "Query",
    "hero": hero
]

let data: [String: AnyHashable] = [
    "data": query
]

[bdbergeron]

This is a Swift language/compiler issue and not inherent to apollo-ios. Try doing this instead:

let data: [String: AnyHashable] = [
  "data": [
    "__typename": "Query",
    "hero": [
      "__typename": "Human",
      "id": "123",
      "name": "Obi-wan Kenobi",
      "friends": [
        [
          "__typename": "Human",
          "id": "456",
          "name": "Padme Amidala"
        ],
        [
          "__typename": "Droid",
          "id": "789",
          "name": "C-3PO"
        ]
      ]
    ] as [String: AnyHashable]
  ] as [String: AnyHashable]
]

Simply adding those as [String: AnyHashable] instructions helps the compiler's understanding of what the nested dictionary values are. Otherwise, the compiler falls back to the implicit [String: Any] type.

[AnthonyMDev]

We've merged in PR #102 to fix this issue. Will be pushed out in the next release!