Data not reflect correctly

Developers Rust
1

Given the code below

use ic_cdk::storage::stable::StableBTreeMap;

static STORE: StableBTreeMap<String, String> = StableBTreeMap::new();

#[ic_cdk::update]
fn update_and_get(key: String, new_value: String) -> String {
    // Update the value
    STORE.insert(key.clone(), new_value);
    
    // Retrieve and return the updated value
    STORE.get(&key).unwrap_or_else(|| "Not found".to_string())
}

When I insert a data and update via update_and_get some how the STORE.get return the old value instead of lastest update data. After few seconds it will update correctly

Can anybody explain why this happened?

1 Like
2

What version of ic-cdk is this? I don’t see anything referring to ic_cdk::storage::stable in recent docs

3

Sorry I copy example from kapa ai

correct code is using this

use ic_stable_structures::{DefaultMemoryImpl, StableBTreeMap};

version
ic-stable-structures = “0.6.5”

4

After few seconds it will update correctly

What do you mean by this? How are you testing your code?

5

My project kinda complex to read but here is the code for testing

Test Code where the logic is test for update

The issue happened in 3.3 when I testing this in PicJs and staging version of the app (deployed in mainnet).

  • Record updated by the logic in 3.1
  • 3.2 return the old data

I have to wait more than 5 second for polling to make sure the record updated and re-render the state

6

I don’t understand the connection of your linked code with the snippet above. If your linked code behaves as described, then I would first suspect some ordering issue with asynchronous requests. Can you rule that out?

If you truly have a write and subsequent read in the same message, as in the snippet, I would be very surprised to see the described behaviour. Can you actually reproduce the issue in a minimal example with the code from the snippet?

7

You’re right. I try to make a minimal example, but cannot reproduce the issue