Javascript 将复杂的普通对象转换为领域对象?
我试图将接收到的纯javascript对象转换和/或直接传递给Realm对象,但在这方面遇到了困难 “设置”-接收到的普通对象(领域对象转换为Json并返回) 下面是一个简单的模式示例:Javascript 将复杂的普通对象转换为领域对象?,javascript,json,node.js,realm,Javascript,Json,Node.js,Realm,我试图将接收到的纯javascript对象转换和/或直接传递给Realm对象,但在这方面遇到了困难 “设置”-接收到的普通对象(领域对象转换为Json并返回) 下面是一个简单的模式示例: exports.Settings = { name: 'Settings', primaryKey: 'Id', properties: { Id: 'string', User: 'User', FavoriteChanne
exports.Settings = {
name: 'Settings',
primaryKey: 'Id',
properties: {
Id: 'string',
User: 'User',
FavoriteChannels: 'Channel[]',
}
};
exports.User = {
name: 'User',
primaryKey: 'Id',
properties: {
Id: 'string',
FirstName: 'string?',
LastName: 'string?',
PhoneNumbers: 'PhoneNumber[]'
}
};
exports.PhoneNumber = {
name: 'PhoneNumber',
primaryKey: 'Id',
properties: {
Id: 'string',
Number: 'string',
}
};
exports.Channel = {
name: 'Channel',
primaryKey: 'Id',
properties: {
Id: 'string',
ChannelName: 'string?',
Users: 'User[]',
}
};
如果我试图直接在“realm.create”中传递“settings”,则会出现以下错误:
“用户。电话号码
必须是'PhoneNumber[]'
,got'object'([object object]
)
它需要一个数组,但普通对象的集合反序列化为对象/字典?(例如电话号码:{'0':[object]})
。反序列化程序无法知道如何将领域对象的“List{}”
(例如[PhoneNumbers]:List{[0]:[object]})
解析为数组
Realm似乎缺少这类操作的“对称性”,除非我遗漏了什么。解决这个问题的一种方法是在客户端简单地使用对象构造函数,例如:
//file "dataModel.js"
export function Settings(obj) {
this.Id = obj.Id;
this.User = new User(obj.User); //check for null, if property in the schema is nullable, so you don't pass empty objects to Realm - example: obj.User ? new User(obj.User) : null;
this.FavoriteChannels = Object.values(obj.FavoriteChannels).map(m => new Channel(m));
}
export function User(obj) {
this.Id = obj.Id;
this.FirstName = ojb.FirstName;
this.LastName = obj.LastName;
PhoneNumbers = Object.values(obj.PhoneNubmers).map(m => new PhoneNumber(m));
}
export function PhoneNumber(obj) {
this.Id = obj.Id;
this.Nubmer = obj.Number;
}
export function Channel(obj) {
this.Id = obj.Id;
this.ChannelName = obj.ChannelName;
this.Users = Object.values(obj.Users).map(m => new User(m));
}
//file app.js
import * as dataModel from 'path-to-dataModel';
...
//receive data from server and create Settings using the constructor from dataModel
const testObj = new dataModel.Settings(plainSettingsObjectFromServer);
//make any changes to the testObj and send it back to server
现在,我们可以将从客户端接收的普通对象传递到Realm。创建:
realm.create('Settings', {
Id: plainSettingsObject.Id,
User: plainSettingsObject.User,
FavoriteChannels: plainSettingsObject.FavoriteChannels,
}, true)
如何将其转换为JSON?为什么要将其全部取出,然后全部放回?我假设您将其取出,更新一个值,然后再将其推回?如果是这样,为什么不更新写入中的原始对象并跳过所有转换?您可以使用简单的JSON.stringify()将其转换为JSON.至于数据,让我这样说吧-服务器通过套接字(对数据进行序列化和反序列化)向客户端发送领域对象,然后客户端可以进行更改并将其发送回服务器。
realm.create('Settings', {
Id: plainSettingsObject.Id,
User: plainSettingsObject.User,
FavoriteChannels: plainSettingsObject.FavoriteChannels,
}, true)