Vapor Swift Error "Reference to member 'sqlite' cannot be resolved without a contextual type"

Question

On a fresh install of Vapor (from homebrew) I call:

• vapor new Bridge -> success
• vapor xcode -> success
• y (asks if I want to open the project in Xcode) -> opens Xcode project
• vapor --version -> 3.1.10
• vapor build -> fails

The error I get is:

[1/3] Compiling App configure.swift
/Users/josh/Applications/Xcode/Projects/Bridge/Sources/App/configure.swift:31:49: error: reference to member 'sqlite' cannot be resolved without a contextual type
    migrations.add(model: Todo.self, database: .sqlite)
                                               ~^~~~~~
[2/3] Compiling App app.swift

Version Numbers:

• macOS: 10.15.3 (19D76)
• Xcode: 11.4 (11E146)
• Vapor: 3.1.10
• Swift: 5.2

Any help figuring out how to solve this error is appreciated! Let me know if I can provide any more information. Thanks!

Answer 1

Yeah Vapor 3 experience compilation problems on Swift 5.2
https://forums.swift.org/t/vapor-3-swift-5-2-regression/34764

migrations.add(model: Todo.self, database: .sqlite)

The above code, which compiles fine in Swift 5.1, will now result in the following error:

Reference to member 'sqlite' cannot be resolved without a contextual type

This can be fixed by using an explicit type instead of leading-dot syntax:

migrations.add(model: Todo.self, database: DatabaseIdentifier<SQLiteDatabase>.sqlite)