firebase-ios-sdk
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firebase
DataConnect returns misleading error
Description
DataConnect returns a misleading error message.
Consider this:
I've got a schema defined in my schema.gql that has a unique table constraint:
type Friendship @table(key: ["self", "companion"]) @unique(fields: ["self", "companion"]) {
self: User! @ref
friend: User! @ref
...
}
Now if I run this mutation once it works as expected:
mutation AddFriendToUser($userId: UUID!, $companion: UUID!) @auth(level: PUBLIC) {
companionship_insert(data: {
self: { id: $userId },
companion: { id: $companion }
})
}
But if I run the mutation again with exact same parameters it fails as expected but the error message here is really bad:
11.7.1 - [FirebaseDataConnect][I-FDC000000] executeMutation(): <private> grpc call
FAILED with {DataConnectOperationError, message: nil, underlyingError:
Optional(Swift.DecodingError.valueNotFound(Swift.Dictionary<Swift.String, Any>,
Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "companionship_insert", intValue: nil)],
debugDescription: "Cannot get keyed decoding container -- found null value instead", underlyingError: nil)))}.
I would expect to see something like unique constraint failed
Reproducing the issue
- Create a table with a unique table constraint
- Enter some data
- Enter that same data again
- You'll see the misleading output as noted above
Firebase SDK Version
11.13
Xcode Version
16.4
Installation Method
Swift Package Manager
Firebase Product(s)
Data Connect
Targeted Platforms
iOS
Relevant Log Output
11.7.1 - [FirebaseDataConnect][I-FDC000000] executeMutation(): <private> grpc call FAILED with {DataConnectOperationError, message: nil, underlyingError: Optional(Swift.DecodingError.valueNotFound(Swift.Dictionary<Swift.String, Any>, Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "companionship_insert", intValue: nil)], debugDescription: "Cannot get keyed decoding container -- found null value instead", underlyingError: nil)))}.
If using Swift Package Manager, the project's Package.resolved
Expand Package.resolved snippet
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I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.
Thank you for the bug report. We will investigate and reply in a few days.
I was able to reproduce the issue and have a PR out to fix this - https://github.com/firebase/data-connect-ios-sdk/pull/56
