Guide to increasing a field value in Backendless.com

Below is an overview of the table structure I have:


    Table data
----------------------------------
-             User               -
----------------------------------
| objectId |   name   | password |
----------------------------------
| z12ttttt | Matt     | hidden   |
| z12zzzzz | Jobs     | hidden   |
| z12bbbbb | Ballu    | hidden   |
| z12aaaaa | Stephin  | hidden   |
----------------------------------

--------------------------------------------------
-                       Post                     -
--------------------------------------------------
| objectId |   post    |  postBy  | likesCounter |
--------------------------------------------------
| blabla   | Head Pain | z12ttttt |      0       |
| blab12   | Back Pain | z12ttttt |      0       |
| blab23   | Sleepy    | z12ttttt |      0       |
| blab90   | Head Pain | z12zzzzz |      0       |
| blab90   | lets Dance| z12bbbbb |      0       |
| blab90   | lets jump | z12aaaaa |      0       |
--------------------------------------------------
//postBy has a 1 to 1 relationship with User table

Aim: All users can view each other's posts. Now, whenever a user likes someone's post, that post's likeCounter should increase by 1.

Problem: I am unable to find a persistent way to update the likeCounter. The only method that is working is:

1) Retrieve Post

2) Increment likeCounter++

3) Save Post

As you can see, there is a data persistency issue. Please help. It would be better if you could provide me with some workable code. Although I have come across this resource, I am having difficulty implementing it.

javascriptbackendlessmbaas

Answer №1

Check out the Backendless Atomic Counters API for managing counters.

Here is an example in pseudocode:

//Create a counter for each user using their objectId.
var objectId = Post.getObjectId();
// Get the counter manager
var counter = Backendless.Counters.of( counterName );
// Increment or decrement the counter
counter.incrementAndGet( async );

You can find detailed information on all scenarios in the documentation: .

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