in the beforeSave,How to know the original value of key

[lybaiyy123]

On the client side, a user modifies/unset/set/ the key value

On the server side, how to know the original value of key?

for example:
Raw data:
className:todo;
id:'xxxxx',
name:'tom',
age:18

Clinet:
var todo=new Parse.Object('todo')
todo.id='xxxxx'
todo.unset('name')
todo.save()

Server:
Parse.Cloud.beforSave('todo',req=>{
// i want know original value of name
})

Is there a way to know this? thanks.

[lybaiyy123]

i have a idea,but But is there a simpler way?

Parse.Cloud.beforSave('todo',req=>{
// i want know original value of name
if (req.object.dirty('name')){
if (!req.object.get('name')){
//get the Value before modification
req.object.revert('name')
let last_name=req.object.get('name')
//rollback the key
req.object.unset('name')
}
}
})

[omkar-tenkale]

You have the objectid just query the db and get the original row

[lybaiyy123]

You have the objectid just query the db and get the original row

in the Parse.Cloud.beforSave to get db?

[omkar-tenkale]

yes

[omkar-tenkale]

Code not tested but this or something similar will work

Parse.Cloud.beforeSave("todo", (request) => {
const id= request.object.id);
const query = new Parse.Query("todo");
query.equalTo("objectId",id)
var originalobject = await query.first();
var originalname = originalobject.get("name")
//rest of your code
});

[dplewis]

You should be able to get the original via req.original instead of req.object.

https://github.com/parse-community/parse-server/blob/master/src/cloud-code/Parse.Cloud.js#L393