How to diagnose spurious SwiftDataMacros error

Question

Created Mar ’25

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I have a Package.swift file that builds and runs from Xcode 15.2 without issue but fails to compile when built from the command line ("swift build"). The swift version is 6.0.3. I'm at wits end trying to diagnose this and would welcome any thoughts.

The error in question is

error: external macro implementation type 'SwiftDataMacros.PersistentModelMacro' could not be found for macro 'Model()'; plugin for module 'SwiftDataMacros' not found

The code associated with the module is very vanilla.

 import Foundation
import SwiftData
 
@Model
public final class MyObject {
    @Attribute(.unique) public var id:Int64
    public var vertexID:Int64
    public var updatedAt:Date
    public var codeUSRA:Int32
 
    init(id:Int64, vertexID:Int64, updatedAt:Date, codeUSRA:Int32) {
        self.id = id
        self.vertexID = vertexID
        self.updatedAt = updatedAt
        self.codeUSRA = codeUSRA
    }
    
    public static func create(id:Int64, vertexID:Int64, updatedAt:Date, codeUSRA:Int32) -> MyObject {
        MyObject(id: id, vertexID: vertexID, updatedAt: updatedAt, codeUSRA: codeUSRA)
    }
}

Thank you.

Boost

Answer 1

JerryCarter OP

6d

Accepted Answer

If anyone else encounters this, the issue appears to have been environmental - possibly something in the package cache - that survived 'swift package clean' and 'rm -rf .build'. Very frustrating.

0

	import Foundation
	import SwiftData

	@Model
	public final class MyObject {
	@Attribute(.unique) public var id:Int64
	public var vertexID:Int64
	public var updatedAt:Date
	public var codeUSRA:Int32

	init(id:Int64, vertexID:Int64, updatedAt:Date, codeUSRA:Int32) {
	self.id = id
	self.vertexID = vertexID
	self.updatedAt = updatedAt
	self.codeUSRA = codeUSRA
	}

	public static func create(id:Int64, vertexID:Int64, updatedAt:Date, codeUSRA:Int32) -> MyObject {
	MyObject(id: id, vertexID: vertexID, updatedAt: updatedAt, codeUSRA: codeUSRA)
	}
	}