Add NSCopying support to FEMMapping

FastEasyMapping/Source/Core/Mapping/FEMAttribute.h

@@ -8,7 +8,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 typedef _Nullable id (^FEMMapBlock)(id value);
 
-@interface FEMAttribute : NSObject <FEMProperty>
+@interface FEMAttribute : NSObject <NSCopying, FEMProperty>
 
 - (nullable id)mapValue:(nullable id)value;
 - (nullable id)reverseMapValue:(nullable id)value;

FastEasyMapping/Source/Core/Mapping/FEMAttribute.m

@@ -35,6 +35,12 @@ + (instancetype)mappingOfProperty:(NSString *)property toKeyPath:(NSString *)key
     return [[self alloc] initWithProperty:property keyPath:keyPath map:map reverseMap:reverseMap];
 }
 
+#pragma mark - NSCopying
+
+- (instancetype)copyWithZone:(NSZone *)zone {
+    return [[self.class allocWithZone:zone] initWithProperty:self.property keyPath:self.keyPath map:_map reverseMap:_reverseMap];
+}
+
 #pragma mark - Description
 
 - (NSString *)description {

FastEasyMapping/Source/Core/Mapping/FEMMapping.h

@@ -7,7 +7,7 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface FEMMapping : NSObject
+@interface FEMMapping : NSObject <NSCopying>
 
 - (instancetype)init __attribute__((unavailable("use -[FEMMapping initWithObjectClass:] or -[FEMMapping initWithEntityName:] instead")));
 + (instancetype)new __attribute__((unavailable("use -[FEMMapping initWithObjectClass:] or -[FEMMapping initWithEntityName:] instead")));
@@ -19,8 +19,8 @@ NS_ASSUME_NONNULL_BEGIN
 - (instancetype)initWithEntityName:(NSString *)entityName NS_DESIGNATED_INITIALIZER;
 - (instancetype)initWithEntityName:(NSString *)entityName rootPath:(nullable NSString *)rootPath;
 
-@property (nonatomic, readonly, nullable) Class objectClass;
-@property (nonatomic, copy, readonly, nullable) NSString *entityName;
+@property (nonatomic, strong, nullable) Class objectClass;
+@property (nonatomic, copy, nullable) NSString *entityName;
 
 @property (nonatomic, copy, nullable) NSString *rootPath;
 

FastEasyMapping/Source/Core/Mapping/FEMMapping.m

@@ -53,6 +53,29 @@ - (instancetype)initWithEntityName:(NSString *)entityName rootPath:(NSString *)r
     return self;
 }
 
+#pragma mark - NSCopying
+
+- (instancetype)copyWithZone:(NSZone *)zone {
+    FEMMapping *mapping = [self.class allocWithZone:zone];
+    if (self.objectClass) {
+        mapping = [mapping initWithObjectClass:self.objectClass];
+    } else {
+        mapping = [mapping initWithEntityName:self.entityName];
+    }
+    mapping.rootPath = self.rootPath;
+    mapping.primaryKey = self.primaryKey;
+
+    for (FEMAttribute *attribute in self.attributes) {
+        [mapping addAttribute:[attribute copy]];
+    }
+
+    for (FEMRelationship *relationship in self.relationships) {
+        [mapping addRelationship:[relationship copy]];
+    }
+
+    return mapping;
+}
+
 #pragma mark - Attribute Mapping
 
 - (void)addPropertyMapping:(id<FEMProperty>)propertyMapping toMap:(NSMutableDictionary *)map {
@@ -101,6 +124,20 @@ - (NSArray *)relationships {
 	return [_relationshipMap allValues];
 }
 
+- (void)setEntityName:(NSString *)entityName {
+    _entityName = [entityName copy];
+    if (_entityName) {
+        _objectClass = nil;
+    }
+}
+
+- (void)setObjectClass:(Class)objectClass {
+    _objectClass = objectClass;
+    if (_objectClass) {
+        _entityName = nil;
+    }
+}
+
 #pragma mark -
 
 - (FEMAttribute *)primaryKeyAttribute {

FastEasyMapping/Source/Core/Mapping/FEMRelationship.h

@@ -9,7 +9,7 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface FEMRelationship : NSObject <FEMProperty>
+@interface FEMRelationship : NSObject <NSCopying, FEMProperty>
 
 @property (nonatomic, strong) FEMMapping *mapping;
 @property (nonatomic, getter=isToMany) BOOL toMany;

FastEasyMapping/Source/Core/Mapping/FEMRelationship.m

@@ -34,6 +34,16 @@ - (instancetype)initWithProperty:(NSString *)property keyPath:(NSString *)keyPat
     return self;
 }
 
+#pragma mark - NSCopying
+
+- (instancetype)copyWithZone:(NSZone *)zone {
+    FEMRelationship *relationship = [[FEMRelationship allocWithZone:zone] initWithProperty:self.property keyPath:self.keyPath mapping:self.mapping];
+    relationship.assignmentPolicy = self.assignmentPolicy;
+    relationship.toMany = self.toMany;
+    relationship.weak = self.weak;
+    return relationship;
+}
+
 #pragma mark - Shortcut
 
 - (void)setMapping:(nonnull FEMMapping *)mapping forKeyPath:(nullable NSString *)keyPath {