增加 NSNull 的单元测试案例 (#777)

增加模型转字典 Date -> String 的示例代码

MJExtensionDemo.xcodeproj/project.pbxproj

@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		0130EE80233C56D8008D2386 /* MJFrenchUser.m in Sources */ = {isa = PBXBuildFile; fileRef = 0130EE7F233C56D8008D2386 /* MJFrenchUser.m */; };
+		01F28187248F64ED008775BA /* MJCat.m in Sources */ = {isa = PBXBuildFile; fileRef = 01F28186248F64ED008775BA /* MJCat.m */; };
 		2D2DB9CD2317DA07005A689E /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = 2D2DB9CC2317DA07005A689E /* AppDelegate.m */; };
 		2D2DB9D02317DA07005A689E /* ViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 2D2DB9CF2317DA07005A689E /* ViewController.m */; };
 		2D2DB9D32317DA07005A689E /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 2D2DB9D12317DA07005A689E /* Main.storyboard */; };
@@ -86,6 +87,8 @@
 /* Begin PBXFileReference section */
 		0130EE7E233C56D8008D2386 /* MJFrenchUser.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MJFrenchUser.h; sourceTree = "<group>"; };
 		0130EE7F233C56D8008D2386 /* MJFrenchUser.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MJFrenchUser.m; sourceTree = "<group>"; };
+		01F28185248F64ED008775BA /* MJCat.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MJCat.h; sourceTree = "<group>"; };
+		01F28186248F64ED008775BA /* MJCat.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MJCat.m; sourceTree = "<group>"; };
 		2D2DB9C82317DA07005A689E /* MJExtensionDemo.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = MJExtensionDemo.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		2D2DB9CB2317DA07005A689E /* AppDelegate.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AppDelegate.h; sourceTree = "<group>"; };
 		2D2DB9CC2317DA07005A689E /* AppDelegate.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = AppDelegate.m; sourceTree = "<group>"; };
@@ -254,30 +257,32 @@
 		2D2DBA5F2317DBDF005A689E /* Model */ = {
 			isa = PBXGroup;
 			children = (
-				2D2DBA602317DBDF005A689E /* MJDog.m */,
-				2D2DBA612317DBDF005A689E /* MJBaseObject.h */,
-				2D2DBA622317DBDF005A689E /* MJStatus.h */,
 				2D2DBA632317DBDF005A689E /* MJAd.h */,
-				2D2DBA642317DBDF005A689E /* MJStatusResult.h */,
-				2D2DBA652317DBDF005A689E /* MJBox.m */,
-				2D2DBA662317DBDF005A689E /* MJStudent.m */,
-				2D2DBA672317DBDF005A689E /* MJUser.h */,
-				2D2DBA682317DBDF005A689E /* MJPerson.h */,
-				2D2DBA692317DBDF005A689E /* MJBook.m */,
+				2D2DBA732317DBDF005A689E /* MJAd.m */,
+				2D2DBA742317DBDF005A689E /* MJBag.h */,
 				2D2DBA6A2317DBDF005A689E /* MJBag.m */,
-				2D2DBA6B2317DBDF005A689E /* MJExtensionConfig.h */,
+				2D2DBA612317DBDF005A689E /* MJBaseObject.h */,
 				2D2DBA6C2317DBDF005A689E /* MJBaseObject.m */,
-				2D2DBA6D2317DBDF005A689E /* MJDog.h */,
-				2D2DBA6E2317DBDF005A689E /* MJUser.m */,
-				2D2DBA6F2317DBDF005A689E /* MJStudent.h */,
+				2D2DBA762317DBDF005A689E /* MJBook.h */,
+				2D2DBA692317DBDF005A689E /* MJBook.m */,
 				2D2DBA702317DBDF005A689E /* MJBox.h */,
-				2D2DBA712317DBDF005A689E /* MJStatusResult.m */,
-				2D2DBA722317DBDF005A689E /* MJStatus.m */,
-				2D2DBA732317DBDF005A689E /* MJAd.m */,
-				2D2DBA742317DBDF005A689E /* MJBag.h */,
+				2D2DBA652317DBDF005A689E /* MJBox.m */,
+				01F28185248F64ED008775BA /* MJCat.h */,
+				01F28186248F64ED008775BA /* MJCat.m */,
+				2D2DBA6D2317DBDF005A689E /* MJDog.h */,
+				2D2DBA602317DBDF005A689E /* MJDog.m */,
+				2D2DBA6B2317DBDF005A689E /* MJExtensionConfig.h */,
 				2D2DBA752317DBDF005A689E /* MJExtensionConfig.m */,
-				2D2DBA762317DBDF005A689E /* MJBook.h */,
+				2D2DBA682317DBDF005A689E /* MJPerson.h */,
 				2D2DBA772317DBDF005A689E /* MJPerson.m */,
+				2D2DBA622317DBDF005A689E /* MJStatus.h */,
+				2D2DBA722317DBDF005A689E /* MJStatus.m */,
+				2D2DBA642317DBDF005A689E /* MJStatusResult.h */,
+				2D2DBA712317DBDF005A689E /* MJStatusResult.m */,
+				2D2DBA662317DBDF005A689E /* MJStudent.m */,
+				2D2DBA6F2317DBDF005A689E /* MJStudent.h */,
+				2D2DBA672317DBDF005A689E /* MJUser.h */,
+				2D2DBA6E2317DBDF005A689E /* MJUser.m */,
 				0130EE7E233C56D8008D2386 /* MJFrenchUser.h */,
 				0130EE7F233C56D8008D2386 /* MJFrenchUser.m */,
 			);
@@ -469,6 +474,7 @@
 				2D2DBA832317DBE0005A689E /* MJAd.m in Sources */,
 				2D2DBA802317DBE0005A689E /* MJUser.m in Sources */,
 				0130EE80233C56D8008D2386 /* MJFrenchUser.m in Sources */,
+				01F28187248F64ED008775BA /* MJCat.m in Sources */,
 				2D2DBA852317DBE0005A689E /* MJPerson.m in Sources */,
 				2D2DBA7B2317DBE0005A689E /* MJBox.m in Sources */,
 				2D2DBA582317DBB9005A689E /* MJExtensionTests.m in Sources */,

MJExtensionTests/MJExtensionTests.m

@@ -18,6 +18,7 @@
 #import "MJBox.h"
 #import <CoreData/CoreData.h>
 #import "MJFrenchUser.h"
+#import "MJCat.h"
 
 @interface MJExtensionTests : XCTestCase
 
@@ -440,6 +441,19 @@ - (void)testNull {
                           };
     MJUser *testNull = [MJUser mj_objectWithKeyValues:dic];
     MJExtensionLog(@"%@", testNull);
+
+
+    NSDictionary *catDict = @{
+        @"name": @"Tom",
+        @"address": [NSNull null],
+        @"nicknames": @[
+                @"Jerry's Heart",
+                [NSNull null],
+                @"Cowboy Tom",
+        ]
+    };
+    MJCat *cat = [MJCat mj_objectWithKeyValues:catDict];
+    MJExtensionLog(@"%@", cat);
 }
 
 #pragma mark NSCoding示例
@@ -478,6 +492,7 @@ - (void)testReplacedKeyFromPropertyName121 {
 
 #pragma mark 过滤字典的值（比如字符串日期处理为NSDate、字符串nil处理为@""）
 - (void)testNewValueFromOldValue {
+    // JSON -> Object
     // 1.定义一个字典
     NSDictionary *dict = @{
                            @"name" : @"5分钟突破iOS开发",
@@ -492,6 +507,12 @@ - (void)testNewValueFromOldValue {
     NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
     fmt.dateFormat = @"yyyy-MM-dd";
     XCTAssert([[fmt stringFromDate:book.publishedTime] isEqual:@"2011-09-10"]);
+
+    //Object -> JSON
+    NSDictionary *bookDict = [book mj_keyValues];
+
+    XCTAssert([bookDict[@"name"] isEqualToString:@"5分钟突破iOS开发"]);
+    XCTAssert([bookDict[@"publishedTime"] isEqualToString:@"2011-09-10"]);
 }
 
 #pragma mark 使用MJExtensionLog打印模型的所有属性

MJExtensionTests/Model/MJBook.m

@@ -22,4 +22,11 @@ @implementation MJBook
 //    
 //    return oldValue;
 //}
+
+- (void)mj_objectDidConvertToKeyValues:(NSMutableDictionary *)keyValues {
+    NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
+    fmt.dateFormat = @"yyy-MM-dd";
+    // should use sharedFormatter for better performance
+    keyValues[@"publishedTime"] = [fmt stringFromDate:self.publishedTime];
+}
 @end

MJExtensionTests/Model/MJCat.h

@@ -0,0 +1,21 @@
+//
+//  MJCat.h
+//  MJExtensionTests
+//
+//  Created by Frank on 2020/6/9.
+//  Copyright © 2020 MJ Lee. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MJCat : NSObject <MJKeyValue>
+
+@property (nonatomic, copy, nullable) NSString *name;
+@property (nonatomic, copy, nullable) NSArray<NSString *> *nicknames;
+@property (nonatomic, copy, nullable) NSString *address; 
+
+@end
+
+NS_ASSUME_NONNULL_END

MJExtensionTests/Model/MJCat.m

@@ -0,0 +1,19 @@
+//
+//  MJCat.m
+//  MJExtensionTests
+//
+//  Created by Frank on 2020/6/9.
+//  Copyright © 2020 MJ Lee. All rights reserved.
+//
+
+#import "MJCat.h"
+
+@implementation MJCat
+
++ (NSDictionary *)mj_objectClassInArray {
+    return @{
+        @"nicknames" : NSString.class
+    };
+}
+
+@end

README.md

@@ -42,6 +42,7 @@ MJExtension
 	* [Coding](#Coding)
 	* [Camel -> underline](#Camel_underline)
 	* [NSString -> NSDate, nil -> @""](#NSString_NSDate)
+	* [NSDate -> NSString](#NSDate -> NSString)
 	* [More use cases](#More_use_cases)
 
 ---
@@ -550,7 +551,23 @@ Book *book = [Book mj_objectWithKeyValues:dict];
 NSLog(@"name=%@, publisher=%@, publishedTime=%@", book.name, book.publisher, book.publishedTime);
 ```
 
+### NSDate -> NSString
+
+**模型转字典时, 修改 Date 类型至 String**
+
+```objc
+- (void)mj_objectDidConvertToKeyValues:(NSMutableDictionary *)keyValues {
+    // NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
+    // formatter.dateFormat = @"yyy-MM-dd";
+    // should use sharedFormatter for better performance  
+    keyValues[@"publishedTime"] = [sharedFormatter stringFromDate:self.publishedTime];
+}
+```
+
+
+
 ### <a id="More_use_cases"></a> More use cases【更多用法】
+
 - Please reference to `NSObject+MJKeyValue.h` and `NSObject+MJCoding.h`