需要一些数据设计方面的帮助
我有一个名为打印机的班级,他们有一个组织编号。我还有另一个叫做建筑的课程。打印机可以分组在建筑物下。我也有属于组织的用户。所以目前有以下数据结构
Organization name, organization number
Building Name, building location, organization number
Printer, printer details, organization number, building
User, user name, organization number
Message, messageID, urgency, pointer to printer
用户属于某个组织。建筑物也属于一个组织。
以下场景的最佳方法是什么 -
当用户登录时,如果任何打印机有紧急消息,他会看到所有建筑物的图标显示为红色。选择建筑物将向他显示所有打印机。
我是否需要进行多次解析查询?
答案 0 :(得分:1)
试试这个,它可以通过查找打印机状态在一次调用中完成,然后您将决定从返回的对象中获取哪些数据。
//Set query to look for buildings and printers
var query = new Parse.Query("buildings");
query.equalTo("orgId",currentUserOrgId); //Check this line, apply your ID names
var query2 = new Parse.Query("printers");
var mainQuery = Parse.Query.and(query,query2);
mainQuery.find({
success: function(results) {
alert("Successfully retrieved " + results.length + " objects.");
// Do something with the returned Parse.Object values
for (var i = 0; i < results.length; i++) {
//Grab all building names, printers and messages etc here
var object = results[i];
alert(object.id + ' - ' + object.get('printerName'));
//get the values you need this way
if (object.get('urgency') == "urgent"){
//add to an array of urgent printers with the pointer as well
}
//Add more logic here to sort through the class objects and store the data you need for your application
}
},
error: function(error) {
alert("Error: " + error.code + " " + error.message);
}
});