Exchange data bewteen classes

Moralis General
#1

How I exchange data between classes in the same database? I have one class called “Article List” where I store all the articles and in “_User” class I have a column called “User Articles” so when a purchase is done the article in Article list moves to User Articles, but I don’t know how to do that, I tried to do a user.set(“User Articles”, new_article) but that would delete the articles that rhe user had before, thanks for your time.

#2

Hi,
You may want to create another class called “User Articles” that has user and article as columns.

#3

How is that going to solve my problem? I dont see how

#4

Can you describe your problem better then?

#5

I thought that if you create another class, you don’t have to move anything if you would have a column specific to a user.

#6

I want to add content to a column but without removing the content that it already has

#7

and what kind of data has that column?
usually you can do that by reading the previous column data for a particular entry, concatenating the new data and adding the new resulted data as the final value to that entry

#8

The column is an array

#9

Something like this then: https://stackoverflow.com/questions/35517573/appending-data-to-an-array-in-parse-cloud-code ?

#10

Yeah I tried concatetenating using this code:

async function add_random_article(){
let user = await Moralis.User.current();
let random_article = await randon_article();
let attributes = [user[“attributes”][“Articles”] + random_article];
user.set(“Articles”, attributes);
user.save();
}

“Articles” column is an array, and when I do this it only displays other type of data

#11

Yes that is what i am looking for, Thanksss