Add defaultValue parameter to @Attribute

The `@NSManaged` properties cannot have initializers,
but the attribute can still carry the defaultValue.

Author: helje5

Sources/ManagedModelMacros/ModelMacro/MetadataSlot.swift

@@ -42,10 +42,6 @@ extension ModelMacro {
       labeledExpressions.append(.init(
         label: "valueType", expression: ExprSyntax("\(valueType).self")
       ))
-      // TBD: put it in here, or not? Would also need to do it in fallback?
-      labeledExpressions.append(.init(
-        label: "defaultValue", expression: ExprSyntax("nil")
-      ))
 
       return ExprSyntax(FunctionCallExprSyntax(callee: ExprSyntax("CoreData.NSAttributeDescription")) {
         labeledExpressions

Sources/ManagedModels/ModelMacroDefinition.swift

@@ -12,13 +12,15 @@
  *                   e.g. ``Schema/Attribute/Option/unique``, or none.
  *   - originalName: The peer to CoreData's `renamingIdentifier`.
  *   - hashModifier: The peer to CoreData's `versionHashModifier`.
+ *   - defaultValue: The default value for the property.
  */
 @available(swift 5.9)
 @attached(peer)
 public macro Attribute(
   _ options: NSAttributeDescription.Option...,
   originalName: String? = nil,
-  hashModifier: String? = nil
+  hashModifier: String? = nil,
+  defaultValue: Any?    = nil
 ) = #externalMacro(module: "ManagedModelMacros", type: "AttributeMacro")
 
 

Sources/ManagedModels/SchemaCompatibility/NSAttributeDescription+Data.swift

@@ -238,8 +238,8 @@ public extension NSAttributeDescription {
   // a few more datapoints.
   convenience init(_ options: Option..., originalName: String? = nil,
                    hashModifier: String? = nil,
-                   name: String, valueType: Any.Type,
-                   defaultValue: Any? = nil)
+                   defaultValue: Any? = nil,
+                   name: String, valueType: Any.Type)
   {
     self.init(name: name, originalName: originalName, options: options,
               valueType: valueType, defaultValue: defaultValue,

Tests/ManagedModelMacrosTests/ManagedModelMacrosTests.swift

@@ -126,7 +126,7 @@ final class ModelMacroTests: XCTestCase {
     XCTAssertTrue(explodedSource.contains("static let schemaMetadata"))
     XCTAssertTrue(explodedSource.contains(
       """
-      metadata: CoreData.NSAttributeDescription(.external, originalName: "First", name: "firstname", valueType: Swift.String.self, defaultValue: nil))
+      metadata: CoreData.NSAttributeDescription(.external, originalName: "First", name: "firstname", valueType: Swift.String.self))
       """
     ))
 
@@ -282,7 +282,7 @@ final class ModelMacroTests: XCTestCase {
       """
     ))
 
-    #if true
+    #if false
     print("Exploded:---\n")
     print(explodedSource)
     print("\n-----")