领域+对象映射器+ SwityJSON

本文介绍了领域+对象映射器+ SwityJSON的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我在映射对象方面需要帮助

领域模型: gist.github/n1tesh/7d6c6e155285dd6b39c8edba76f6eba5

这就是我的工作方式

// write request result to realm database let entries = json["data"] realm.beginWrite() let entry: ChatGroups = Mapper<ChatGroups>().map(JSONObject: entries)! realm.add(entry, update: true) do { try realmmitWrite() } catch { }

JSON响应: gist.github/n1tesh/bf84cbd930f8c76b340f21723a217ebe

但是我遇到了错误 fatal error: unexpectedly found nil while unwrapping an Optional value

请帮我解决我做错的事情.

解决方案

创建一个类以将Array转换为List，因为Realm不接受数组.

import ObjectMapper import RealmSwift public class ListTransform<T:RealmSwift.Object> : TransformType where T:Mappable { public typealias Object = List<T> public typealias JSON = [AnyObject] let mapper = Mapper<T>() public init(){} public func transformFromJSON(_ value: Any?) -> Object? { let results = List<T>() if let value = value as? [AnyObject] { for json in value { if let obj = mapper.map(JSONObject: json) { results.append(obj) } } } return results } public func transformToJSON(_ value: Object?) -> JSON? { var results = [AnyObject]() if let value = value { for obj in value { let json = mapper.toJSON(obj) results.append(json as AnyObject) } } return results } }

然后在ChatGroups类中，您必须调用Transform函数进行转换，进行以下更改:

updated_by <- map["updated_by"] members <- map["member"]

对此:

updated_by <- (map["updated_by"], ListTransform<QuorgUser>()) members <- (map["member"], ListTransform<GroupMember>())

I need help in mapping my object

Realm Model: gist.github/n1tesh/7d6c6e155285dd6b39c8edba76f6eba5

This is how I'm doing

// write request result to realm database let entries = json["data"] realm.beginWrite() let entry: ChatGroups = Mapper<ChatGroups>().map(JSONObject: entries)! realm.add(entry, update: true) do { try realmmitWrite() } catch { }

JSON Response: gist.github/n1tesh/bf84cbd930f8c76b340f21723a217ebe

But i'm getting error fatal error: unexpectedly found nil while unwrapping an Optional value

Please help me out with what I'm doing wrong.

解决方案

Create a class to transform Array to List, because the Realm doesn't accept arrays.

import ObjectMapper import RealmSwift public class ListTransform<T:RealmSwift.Object> : TransformType where T:Mappable { public typealias Object = List<T> public typealias JSON = [AnyObject] let mapper = Mapper<T>() public init(){} public func transformFromJSON(_ value: Any?) -> Object? { let results = List<T>() if let value = value as? [AnyObject] { for json in value { if let obj = mapper.map(JSONObject: json) { results.append(obj) } } } return results } public func transformToJSON(_ value: Object?) -> JSON? { var results = [AnyObject]() if let value = value { for obj in value { let json = mapper.toJSON(obj) results.append(json as AnyObject) } } return results } }

Then in your ChatGroups class you have to call the Transform function to make the transformation, make this change:

updated_by <- map["updated_by"] members <- map["member"]

to this:

updated_by <- (map["updated_by"], ListTransform<QuorgUser>()) members <- (map["member"], ListTransform<GroupMember>())