Merge pull request #9 from PureSwift/feature/decimal

Add `Decimal` support #8

Author: colemancda

Sources/CoreDataModel/NSAttributeType.swift

@@ -36,6 +36,8 @@ public extension NSAttributeType {
             self = .UUIDAttributeType
         case .url:
             self = .URIAttributeType
+        case .decimal:
+            self = .decimalAttributeType
         }
     }
 }
@@ -53,7 +55,7 @@ public extension AttributeType {
         case .integer64AttributeType:
             self = .int64
         case .decimalAttributeType:
-            return nil
+            self = .decimal
         case .doubleAttributeType:
             self = .double
         case .floatAttributeType:

Sources/CoreDataModel/NSManagedObject.swift

@@ -47,6 +47,8 @@ internal extension NSManagedObject {
             return .float(value)
         } else if let value = objectValue as? Double {
             return .double(value)
+        } else if let value = objectValue as? NSDecimalNumber {
+            return .decimal(value as Decimal)
         } else {
             assertionFailure("Invalid CoreData attribute value \(objectValue)")
             throw CocoaError(.coreData)
@@ -82,6 +84,8 @@ internal extension NSManagedObject {
             objectValue = value as NSNumber
         case let .double(value):
             objectValue = value as NSNumber
+        case let .decimal(value):
+            objectValue = value as NSDecimalNumber
         }
 
         self.setValue(objectValue, forKey: key.rawValue)

Sources/CoreModel/AttributeType.swift

@@ -42,4 +42,7 @@ public enum AttributeType: String, Codable, CaseIterable, Sendable {
 
     /// URL
     case url
+    
+    /// Decimal
+    case decimal
 }

Sources/CoreModel/Decodable.swift

@@ -161,6 +161,16 @@ extension Data: AttributeDecodable {
     }
 }
 
+extension Decimal: AttributeDecodable {
+    
+    public init?(attributeValue: AttributeValue) {
+        guard case let .decimal(value) = attributeValue else {
+            return nil
+        }
+        self = value
+    }
+}
+
 extension Float: AttributeDecodable {
 
     public init?(attributeValue: AttributeValue) {
@@ -192,6 +202,7 @@ extension Int: AttributeDecodable {
             .data,
             .date,
             .bool,
+            .decimal,
             .float,
             .double:
             return nil
@@ -216,6 +227,7 @@ extension Int8: AttributeDecodable {
             .data,
             .date,
             .bool,
+            .decimal,
             .float,
             .double:
             return nil
@@ -240,6 +252,7 @@ extension Int16: AttributeDecodable {
             .data,
             .date,
             .bool,
+            .decimal,
             .float,
             .double:
             return nil
@@ -264,6 +277,7 @@ extension Int32: AttributeDecodable {
             .data,
             .date,
             .bool,
+            .decimal,
             .float,
             .double:
             return nil
@@ -288,6 +302,7 @@ extension Int64: AttributeDecodable {
             .data,
             .date,
             .bool,
+            .decimal,
             .float,
             .double:
             return nil
@@ -312,6 +327,7 @@ extension UInt: AttributeDecodable {
             .data,
             .date,
             .bool,
+            .decimal,
             .float,
             .double:
             return nil
@@ -337,6 +353,7 @@ extension UInt8: AttributeDecodable {
             .data,
             .date,
             .bool,
+            .decimal,
             .float,
             .double:
             return nil
@@ -362,6 +379,7 @@ extension UInt16: AttributeDecodable {
             .data,
             .date,
             .bool,
+            .decimal,
             .float,
             .double:
             return nil
@@ -387,6 +405,7 @@ extension UInt32: AttributeDecodable {
             .data,
             .date,
             .bool,
+            .decimal,
             .float,
             .double:
             return nil
@@ -411,6 +430,7 @@ extension UInt64: AttributeDecodable {
             .data,
             .date,
             .bool,
+            .decimal,
             .float,
             .double:
             return nil

Sources/CoreModel/Decoder.swift

@@ -192,14 +192,6 @@ internal extension ModelDataDecoder {
                 throw DecodingError.dataCorrupted(DecodingError.Context(codingPath: codingPath, debugDescription: "Cannot decode \(type) from identifier \(id)"))
             }
             return value as! T
-        } else if type == Data.self {
-            return try decodeAttribute(Data.self, forKey: key) as! T
-        } else if type == Date.self {
-            return try decodeAttribute(Date.self, forKey: key) as! T
-        } else if type == UUID.self {
-            return try decodeAttribute(UUID.self, forKey: key) as! T
-        } else if type == URL.self {
-            return try decodeAttribute(URL.self, forKey: key) as! T
         } else if let decodableType = type as? AttributeDecodable.Type {
             return try decodeAttribute(decodableType, forKey: key) as! T
         } else {

Sources/CoreModel/Encodable.swift

@@ -147,3 +147,8 @@ extension URL: AttributeEncodable {
 
     public var attributeValue: AttributeValue { .url(self) }
 }
+
+extension Decimal: AttributeEncodable {
+    
+    public var attributeValue: AttributeValue { .decimal(self) }
+}

Sources/CoreModel/Encoder.swift

@@ -123,15 +123,7 @@ internal extension ModelDataEncoder {
 
     func setEncodable <T: Encodable> (_ value: T, forKey key: PropertyKey) throws {
 
-        if let data = value as? Data {
-            try setAttribute(data.attributeValue, forKey: key)
-        } else if let date = value as? Date {
-            try setAttribute(date.attributeValue, forKey: key)
-        } else if let uuid = value as? UUID {
-            try setAttribute(uuid.attributeValue, forKey: key)
-        } else if let url = value as? URL {
-            try setAttribute(url.attributeValue, forKey: key)
-        } else if let encodable = value as? AttributeEncodable {
+        if let encodable = value as? AttributeEncodable {
             try setAttribute(encodable.attributeValue, forKey: key)
         } else {
             // encode using Encodable, container should write directly.

Sources/CoreModel/PropertyValue.swift

@@ -22,6 +22,7 @@ public enum AttributeValue: Equatable, Hashable, Codable {
     case int64(Int64)
     case float(Float)
     case double(Double)
+    case decimal(Decimal)
 }
 
 /// CoreModel Relationship Value