Question

上下文

// JSON
"Name_Field" : {
    "param_1":"value_1",
    "param_2":"value_2"
}

// Class
class Field {
    name
    param1
    param2
}

// Mapping Functionality
[mapping addAttributeMappingFromKeyOfRepresentationToAttribute:@"name"];
[mapping addAttributeMappingsFromDictionary:@{
    @"(name).param_1":@"param1",
    @"(name).param_2":@"param2"
}];

问题：

我目前正在使用上面的JSON / Class / Mapping代码。我已经使用了一段时间，一切都按预期工作。

今天我遇到了JSON中的密钥包含括号并导致映射失败的情况。我有办法让这个工作吗？

谢谢！

示例：

"Name (haha this will break)" : {
    "param_1":"value_1",
    "param_2":"value_2"
}

Answer 1

我认为RestKit感到困惑，因为它不知道在映射时使用哪个括号。所以我的猜测是用大括号替换它们：

[mapping addAttributeMappingsFromDictionary:@{
    @"{name}.param_1":@"param1",
    @"{name}.param_2":@"param2"
}];

如果有效，请告诉我。

Answer 2

<强>解决方案：

更新RKStringByReplacingUnderscoresWithBraces中的RKPropertyMapping方法，不要用括号替换括号，然后确保在属性映射中使用大括号。

// RKPropertyMapping
static NSString *RKStringByReplacingUnderscoresWithBraces(NSString *string)
{
    return string;
    //return [[string stringByReplacingOccurrencesOfString:@"(" withString:@"{"] stringByReplacingOccurrencesOfString:@")" withString:@"}"];
}


// Attribute Mappings
[mapping addAttributeMappingsFromDictionary:@{
    @"{name}.param_1":@"param1",
    @"{name}.param_2":@"param2"
}];

<强>解释

https://github.com/RestKit/RestKit/wiki/Object-mapping#handling-dynamic-nesting-attributes

在上面的RestKit文档中，当您尝试将某个键映射到属性时，系统会指示您使用addAttributeMappingFromKeyOfRepresentationToAttribute，然后使用括号映射嵌套键以表示您的属性，后跟一个＆＃39;。＆＃ 39;和你的嵌套密钥。

在RestKit中，它从addAttributeMappingFromKeyOfRepresentationToAttribute属性映射执行映射后，循环遍历所有已定义的属性映射，以使用键中的实际值替换占位符，以便进行其他映射操作。在此过程中，它会创建一个新的RKPropertyMapping对象并设置它的sourceKeyPath和destinationKeyPath。这些属性的属性设置器获取值并用括号替换括号，然后RestKit找不到带括号的值的错误映射。

示例上下文：

// JSON   
{ "blake": {
    "email": "blake@restkit.org",
    "favorite_animal": "Monkey"
    }
}

// Class
@interface User : NSObject
@property (nonatomic, copy) NSString* email
@property (nonatomic, copy) NSString* username;
@property (nonatomic, copy) NSString* favoriteAnimal;
@end

// Mapping
RKObjectMapping* mapping = [RKObjectMapping mappingForClass:[User class] ];
[mapping addAttributeMappingFromKeyOfRepresentationToAttribute:@"username"];
[mapping addAttributeMappingsFromDictionary:@{
    @"(username).email": @"email",
    @"(username).favorite_animal": @"favoriteAnimal"
}];

示例映射：

// Resulting Attribute Mappings
@"{username}.email": @"email",
@"{username}.favorite_animal": @"favoriteAnimal"


// 1. The attribute mapping has been performed for 'blake' > 'username'
// 2. RestKit now loops through your attribute mappings to replace '{username}' with 'blake' so your further nested attribute mappings can take place
// 3. Example: @"{username}.email": @"email"
      sourceKeyPath = @"{username}.email"
      destinationKeyPath = @"email"

      * replaces values *
      sourceKeyPath = @"blake.email"
      destinationKeyPath = @"email"

      * creates a new RKPropertyMapping object *
      RKPropertyMapping
        - sourceKeyPath = @"blake.email"
        - destinationKeyPath = @"email"

带括号的示例映射：

// JSON   
{ "blake (a.k.a GOAT)": {
    "email": "blake@restkit.org",
    "favorite_animal": "Monkey"
    }
}

// Resulting Attribute Mappings
@"{username}.email": @"email",
@"{username}.favorite_animal": @"favoriteAnimal"


// 1. The attribute mapping has been performed for 'blake (a.k.a GOAT)' > 'username'
// 2. RestKit now loops through your attribute mappings to replace '{username}' with 'blake (a.k.a GOAT)' so your further nested attribute mappings can take place
// 3. Example: @"{username}.email": @"email"
      sourceKeyPath = @"{username}.email"
      destinationKeyPath = @"email"

      * replaces values *
      sourceKeyPath = @"blake (a.k.a GOAT).email"
      destinationKeyPath = @"email"

      * creates a new RKPropertyMapping object *
      RKPropertyMapping
        - sourceKeyPath = @"blake {a.k.a GOAT}.email" // DOES NOT MATCH
        - destinationKeyPath = @"email"

使用父键作为属性和键的RestKit映射包含括号

2 个答案: