Alamofire 嵌套 JSON 序列化程序
Alamofire Nested JSON Serializer
我正在使用 Alamofire 向 JSON API 发出请求。我正在尝试序列化一个 Post 对象的集合,这些对象中有一个作者对象和一个注释数组。
我做了以下事情:
第 1 步:按照步骤操作
扩展了 Alamofire.Request
对象并添加了 ResponseObjectSerializer
和 ResponseCollectionSerializer
,如 Generic Response Object Serialization
下的文档中所述
第 2 步:添加以下模型
Post.swift
final class Post : ResponseObjectSerializable, ResponseCollectionSerializable {
let id: Int
let title: String
let body: String
let author: Author
let comments: [Comment]
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
self.id = representation.valueForKeyPath("id") as Int
self.body = representation.valueForKeyPath("body") as String
self.title = representation.valueForKeyPath("title") as String
// What do I do with the author object
var authorObj: AnyObject? = representation.valueForKeyPath("author")
if (authorObj != nil) {
self.author = Author(response: response, representation: authorObj!)!
}
// What do I do with the comments Array?
self.comments = Comment.collection(response: response, representation: representation.valueForKeyPath("comments")!)
}
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Post] {
var postList:[Post] = []
for p in representation as [AnyObject] {
postList.append(Post(response: response, representation: p)!)
}
return postList
}
}
Comment.swift
final class Comment : ResponseObjectSerializable, ResponseCollectionSerializable {
let id: Int
let body: String
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
self.id = representation.valueForKeyPath("id") as Int
self.body = representation.valueForKeyPath("body") as String
}
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Comment] {
var commentList:[Comment] = []
var commentArray = representation as [AnyObject]
for c in commentArray {
commentList.append(Comment(response: response, representation: c)!)
}
return commentList
}
}
Author.swift
final class Author : ResponseObjectSerializable {
let id: Int
let name: String
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
self.id = representation.valueForKeyPath("id") as Int
self.name = representation.valueForKeyPath("name") as String
}
}
第三步:表示是一个Builtin.RawPointer
(lldb) po representation
(instance_type = Builtin.RawPointer = 0x00007f8b9ae1d290 -> 0x000000010c7f4c88 (void *)0x000000010c7f4dc8: __NSArrayI)
有什么建议吗?
第 4 步:这是我调用代码的方式
class NetworkPostProvider {
typealias RequestsCollectionResponse = (NSError?, [Post]?) -> Void
class func all(onCompletion: RequestsCollectionResponse) {
var manager = Alamofire.Manager.sharedInstance
manager.session.configuration.HTTPAdditionalHeaders = [
"Authorization": NSUserDefaults.standardUserDefaults().valueForKey(DEFAULTS_TOKEN) as String
]
manager.request(.GET, BASE_URL + "/alamofire/nested")
.validate()
.responseCollection({ (req, res, requests:[Post]?, error) -> Void in
println("Request:")
println(req)
println("Response:")
println(res)
println(requests)
})
}
}
你的解析逻辑肯定有问题(主要是安全问题)。我仔细检查并尽我所能重新创建了您的场景,并重新设计了看起来有问题的部分。我已经设法修复了您的解析,我很确定这是问题所在。从 Alamofire 的角度来看,您似乎正在正确调用所有内容。
import Foundation
import Alamofire
@objc public protocol ResponseObjectSerializable {
init?(response: NSHTTPURLResponse, representation: AnyObject)
}
@objc public protocol ResponseCollectionSerializable {
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Self]
}
extension Alamofire.Request {
public func responseObject<T: ResponseObjectSerializable>(completionHandler: (NSURLRequest, NSHTTPURLResponse?, T?, NSError?) -> Void) -> Self {
let serializer: Serializer = { (request, response, data) in
let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
let (JSON: AnyObject?, serializationError) = JSONSerializer(request, response, data)
if response != nil && JSON != nil {
return (T(response: response!, representation: JSON!), nil)
} else {
return (nil, serializationError)
}
}
return response(serializer: serializer, completionHandler: { (request, response, object, error) in
completionHandler(request, response, object as? T, error)
})
}
public func responseCollection<T: ResponseCollectionSerializable>(completionHandler: (NSURLRequest, NSHTTPURLResponse?, [T]?, NSError?) -> Void) -> Self {
let serializer: Serializer = { (request, response, data) in
let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
let (JSON: AnyObject?, serializationError) = JSONSerializer(request, response, data)
if response != nil && JSON != nil {
return (T.collection(response: response!, representation: JSON!), nil)
} else {
return (nil, serializationError)
}
}
return response(serializer: serializer, completionHandler: { (request, response, object, error) in
completionHandler(request, response, object as? [T], error)
})
}
}
final class Post : ResponseObjectSerializable, ResponseCollectionSerializable, Printable {
let id: Int
let title: String
let body: String
let author: Author
let comments: [Comment]
var description: String {
return "Post {id = \(self.id), title = \(self.title), body = \(self.body), author = \(self.author), comments = \(self.comments)}"
}
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
let id = representation.valueForKeyPath("id") as? Int
let title = representation.valueForKeyPath("title") as? String
let body = representation.valueForKeyPath("body") as? String
var author: Author?
if let authorObject: AnyObject = representation.valueForKeyPath("author") {
author = Author(response: response, representation: authorObject)
}
var comments: [Comment]?
if let commentsObject: AnyObject = representation.valueForKeyPath("comments") {
comments = Comment.collection(response: response, representation: commentsObject)
}
if id != nil && body != nil && title != nil && author != nil && comments != nil {
self.id = id!
self.title = title!
self.body = body!
self.author = author!
self.comments = comments!
} else {
self.id = 0
self.title = ""
self.body = ""
self.author = Author(id: 0, name: "")
self.comments = [Comment]()
return nil
}
}
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Post] {
var postList = [Post]()
for p in representation as [AnyObject] {
if let post = Post(response: response, representation: p) {
postList.append(post)
}
}
return postList
}
}
final class Comment : ResponseObjectSerializable, ResponseCollectionSerializable, Printable {
let id: Int
let body: String
var description: String {
return "Comment {id = \(self.id), name = \(self.body)"
}
init(id: Int, body: String) {
self.id = id
self.body = body
}
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
let id = representation.valueForKeyPath("id") as? Int
let body = representation.valueForKeyPath("body") as? String
if id != nil && body != nil {
self.id = id!
self.body = body!
} else {
self.id = 0
self.body = ""
return nil
}
}
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Comment] {
var commentList = [Comment]()
var commentArray = representation as [AnyObject]
for c in commentArray {
if let comment = Comment(response: response, representation: c) {
commentList.append(comment)
}
}
return commentList
}
}
final class Author : ResponseObjectSerializable, Printable {
let id: Int
let name: String
var description: String {
return "Author {id = \(self.id), name = \(self.name)}"
}
init(id: Int, name: String) {
self.id = id
self.name = name
}
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
let id = representation.valueForKeyPath("id") as? Int
let name = representation.valueForKeyPath("name") as? String
if id != nil && name != nil {
self.id = id!
self.name = name!
} else {
self.id = 0
self.name = ""
return nil
}
}
}
class NetworkPostProvider {
typealias RequestsCollectionResponse = (NSError?, [Post]?) -> Void
class func all(onCompletion: RequestsCollectionResponse) {
var manager = Alamofire.Manager.sharedInstance
manager.session.configuration.HTTPAdditionalHeaders = [
"Authorization": NSUserDefaults.standardUserDefaults().valueForKey("12345678") as String
]
let request = manager.request(.GET, "Some base url" + "/alamofire/nested")
request.validate()
request.responseCollection { (req, res, requests: [Post]?, error) in
println("Request:")
println(req)
println("Response:")
println(res)
println(requests)
}
}
class func forceLoadJSON() {
let path = NSBundle.mainBundle().pathForResource("stacked", ofType: "json")!
let data = NSData(contentsOfFile: path)!
if let json: AnyObject = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments, error: nil) {
println(json)
let fakeResponse = NSHTTPURLResponse(URL: NSURL(string: "")!, statusCode: 200, HTTPVersion: nil, headerFields: nil)!
let posts = Post.collection(response: fakeResponse, representation: json)
println("Posts: \(posts)")
} else {
println("Failed to load the posts")
}
}
}
forceloadJSON
方法重新创建请求从服务器返回后 Alamofire 将触发的所有内容。问题是我实际上无法调用您的服务器 b/c 您没有提供必要的凭据或 URL 来实际调用它。如果您想让我进一步调试它,我将需要该信息。我几乎可以肯定,您的问题已经通过我对 Post
、Comment
和 Author
class 所做的所有更改得到解决。
我建议向前推进的另一个改变是使用结构而不是 classes。 Swift 1.1 编译器中目前有一个 bug,它不允许您在 class 内的可失败初始化程序中 return nil
。这很可能已在 Swift 1.2 中修复,但我还没有检查过。
我要更改的最后一件事是修改 ResponseCollectionSerializable
函数 collection
以便能够 return 可选数组或可选数组。这是因为您的集合方法可能无法创建实例,因为它正在调用可失败的初始值设定项。目前它正在隐藏这些错误,您不知道解析是否失败。您以前会在那种情况下崩溃(也许这就是您想要的)。我对其进行了修改,使其不会崩溃,但错误随后被埋没。
我正在使用 Alamofire 向 JSON API 发出请求。我正在尝试序列化一个 Post 对象的集合,这些对象中有一个作者对象和一个注释数组。
我做了以下事情:
第 1 步:按照步骤操作
扩展了 Alamofire.Request
对象并添加了 ResponseObjectSerializer
和 ResponseCollectionSerializer
,如 Generic Response Object Serialization
第 2 步:添加以下模型
Post.swift
final class Post : ResponseObjectSerializable, ResponseCollectionSerializable {
let id: Int
let title: String
let body: String
let author: Author
let comments: [Comment]
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
self.id = representation.valueForKeyPath("id") as Int
self.body = representation.valueForKeyPath("body") as String
self.title = representation.valueForKeyPath("title") as String
// What do I do with the author object
var authorObj: AnyObject? = representation.valueForKeyPath("author")
if (authorObj != nil) {
self.author = Author(response: response, representation: authorObj!)!
}
// What do I do with the comments Array?
self.comments = Comment.collection(response: response, representation: representation.valueForKeyPath("comments")!)
}
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Post] {
var postList:[Post] = []
for p in representation as [AnyObject] {
postList.append(Post(response: response, representation: p)!)
}
return postList
}
}
Comment.swift
final class Comment : ResponseObjectSerializable, ResponseCollectionSerializable {
let id: Int
let body: String
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
self.id = representation.valueForKeyPath("id") as Int
self.body = representation.valueForKeyPath("body") as String
}
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Comment] {
var commentList:[Comment] = []
var commentArray = representation as [AnyObject]
for c in commentArray {
commentList.append(Comment(response: response, representation: c)!)
}
return commentList
}
}
Author.swift
final class Author : ResponseObjectSerializable {
let id: Int
let name: String
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
self.id = representation.valueForKeyPath("id") as Int
self.name = representation.valueForKeyPath("name") as String
}
}
第三步:表示是一个Builtin.RawPointer
(lldb) po representation
(instance_type = Builtin.RawPointer = 0x00007f8b9ae1d290 -> 0x000000010c7f4c88 (void *)0x000000010c7f4dc8: __NSArrayI)
有什么建议吗?
第 4 步:这是我调用代码的方式
class NetworkPostProvider {
typealias RequestsCollectionResponse = (NSError?, [Post]?) -> Void
class func all(onCompletion: RequestsCollectionResponse) {
var manager = Alamofire.Manager.sharedInstance
manager.session.configuration.HTTPAdditionalHeaders = [
"Authorization": NSUserDefaults.standardUserDefaults().valueForKey(DEFAULTS_TOKEN) as String
]
manager.request(.GET, BASE_URL + "/alamofire/nested")
.validate()
.responseCollection({ (req, res, requests:[Post]?, error) -> Void in
println("Request:")
println(req)
println("Response:")
println(res)
println(requests)
})
}
}
你的解析逻辑肯定有问题(主要是安全问题)。我仔细检查并尽我所能重新创建了您的场景,并重新设计了看起来有问题的部分。我已经设法修复了您的解析,我很确定这是问题所在。从 Alamofire 的角度来看,您似乎正在正确调用所有内容。
import Foundation
import Alamofire
@objc public protocol ResponseObjectSerializable {
init?(response: NSHTTPURLResponse, representation: AnyObject)
}
@objc public protocol ResponseCollectionSerializable {
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Self]
}
extension Alamofire.Request {
public func responseObject<T: ResponseObjectSerializable>(completionHandler: (NSURLRequest, NSHTTPURLResponse?, T?, NSError?) -> Void) -> Self {
let serializer: Serializer = { (request, response, data) in
let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
let (JSON: AnyObject?, serializationError) = JSONSerializer(request, response, data)
if response != nil && JSON != nil {
return (T(response: response!, representation: JSON!), nil)
} else {
return (nil, serializationError)
}
}
return response(serializer: serializer, completionHandler: { (request, response, object, error) in
completionHandler(request, response, object as? T, error)
})
}
public func responseCollection<T: ResponseCollectionSerializable>(completionHandler: (NSURLRequest, NSHTTPURLResponse?, [T]?, NSError?) -> Void) -> Self {
let serializer: Serializer = { (request, response, data) in
let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
let (JSON: AnyObject?, serializationError) = JSONSerializer(request, response, data)
if response != nil && JSON != nil {
return (T.collection(response: response!, representation: JSON!), nil)
} else {
return (nil, serializationError)
}
}
return response(serializer: serializer, completionHandler: { (request, response, object, error) in
completionHandler(request, response, object as? [T], error)
})
}
}
final class Post : ResponseObjectSerializable, ResponseCollectionSerializable, Printable {
let id: Int
let title: String
let body: String
let author: Author
let comments: [Comment]
var description: String {
return "Post {id = \(self.id), title = \(self.title), body = \(self.body), author = \(self.author), comments = \(self.comments)}"
}
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
let id = representation.valueForKeyPath("id") as? Int
let title = representation.valueForKeyPath("title") as? String
let body = representation.valueForKeyPath("body") as? String
var author: Author?
if let authorObject: AnyObject = representation.valueForKeyPath("author") {
author = Author(response: response, representation: authorObject)
}
var comments: [Comment]?
if let commentsObject: AnyObject = representation.valueForKeyPath("comments") {
comments = Comment.collection(response: response, representation: commentsObject)
}
if id != nil && body != nil && title != nil && author != nil && comments != nil {
self.id = id!
self.title = title!
self.body = body!
self.author = author!
self.comments = comments!
} else {
self.id = 0
self.title = ""
self.body = ""
self.author = Author(id: 0, name: "")
self.comments = [Comment]()
return nil
}
}
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Post] {
var postList = [Post]()
for p in representation as [AnyObject] {
if let post = Post(response: response, representation: p) {
postList.append(post)
}
}
return postList
}
}
final class Comment : ResponseObjectSerializable, ResponseCollectionSerializable, Printable {
let id: Int
let body: String
var description: String {
return "Comment {id = \(self.id), name = \(self.body)"
}
init(id: Int, body: String) {
self.id = id
self.body = body
}
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
let id = representation.valueForKeyPath("id") as? Int
let body = representation.valueForKeyPath("body") as? String
if id != nil && body != nil {
self.id = id!
self.body = body!
} else {
self.id = 0
self.body = ""
return nil
}
}
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Comment] {
var commentList = [Comment]()
var commentArray = representation as [AnyObject]
for c in commentArray {
if let comment = Comment(response: response, representation: c) {
commentList.append(comment)
}
}
return commentList
}
}
final class Author : ResponseObjectSerializable, Printable {
let id: Int
let name: String
var description: String {
return "Author {id = \(self.id), name = \(self.name)}"
}
init(id: Int, name: String) {
self.id = id
self.name = name
}
required init?(response: NSHTTPURLResponse, representation: AnyObject) {
let id = representation.valueForKeyPath("id") as? Int
let name = representation.valueForKeyPath("name") as? String
if id != nil && name != nil {
self.id = id!
self.name = name!
} else {
self.id = 0
self.name = ""
return nil
}
}
}
class NetworkPostProvider {
typealias RequestsCollectionResponse = (NSError?, [Post]?) -> Void
class func all(onCompletion: RequestsCollectionResponse) {
var manager = Alamofire.Manager.sharedInstance
manager.session.configuration.HTTPAdditionalHeaders = [
"Authorization": NSUserDefaults.standardUserDefaults().valueForKey("12345678") as String
]
let request = manager.request(.GET, "Some base url" + "/alamofire/nested")
request.validate()
request.responseCollection { (req, res, requests: [Post]?, error) in
println("Request:")
println(req)
println("Response:")
println(res)
println(requests)
}
}
class func forceLoadJSON() {
let path = NSBundle.mainBundle().pathForResource("stacked", ofType: "json")!
let data = NSData(contentsOfFile: path)!
if let json: AnyObject = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments, error: nil) {
println(json)
let fakeResponse = NSHTTPURLResponse(URL: NSURL(string: "")!, statusCode: 200, HTTPVersion: nil, headerFields: nil)!
let posts = Post.collection(response: fakeResponse, representation: json)
println("Posts: \(posts)")
} else {
println("Failed to load the posts")
}
}
}
forceloadJSON
方法重新创建请求从服务器返回后 Alamofire 将触发的所有内容。问题是我实际上无法调用您的服务器 b/c 您没有提供必要的凭据或 URL 来实际调用它。如果您想让我进一步调试它,我将需要该信息。我几乎可以肯定,您的问题已经通过我对 Post
、Comment
和 Author
class 所做的所有更改得到解决。
我建议向前推进的另一个改变是使用结构而不是 classes。 Swift 1.1 编译器中目前有一个 bug,它不允许您在 class 内的可失败初始化程序中 return nil
。这很可能已在 Swift 1.2 中修复,但我还没有检查过。
我要更改的最后一件事是修改 ResponseCollectionSerializable
函数 collection
以便能够 return 可选数组或可选数组。这是因为您的集合方法可能无法创建实例,因为它正在调用可失败的初始值设定项。目前它正在隐藏这些错误,您不知道解析是否失败。您以前会在那种情况下崩溃(也许这就是您想要的)。我对其进行了修改,使其不会崩溃,但错误随后被埋没。