Please help with example code compiler error

Jesse_Grosjean · April 28, 2021, 4:52pm

I'm trying to work through this blog post:

Designing modern data access layers in Swift

Unfortunately I can't get the code to compile. Not sure if I've copy/pasted something incorrectly, if the compiler has changed, or if it didn't work in the first place. I'm seeing compile error on line 249 of this gist, you should be able to just paste into Xcode to see error.

The error happens when trying to compare the Any value of an evaluated PartialKeyPath with a Primitive value. I can see I think why that's not possible, but I'm unsure how to fix the problem or why it might have worked before.

Any thoughts?

Thanks,
Jesse

Jesse_Grosjean · April 29, 2021, 6:04pm

Here's the needed sample code that I was missing:

gist.github.com

https://gist.github.com/ftchirou/c9b5b454a532c14e9320f28cfbea2eee

Primitive+Comparison.swift

internal func == (lhs: Any, rhs: Primitive) -> Bool {
    return isPrimitive(rhs, ofType: rhs.type, equalTo: lhs)
}

internal func < (lhs: Any, rhs: Primitive) -> Bool {
    return isPrimitive(rhs, ofType: rhs.type, lessThan: lhs)
}

internal func <= (lhs: Any, rhs: Primitive) -> Bool {
    return lhs == rhs || lhs < rhs

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