Fetch all() isn't working in Anchor Client

Question

I am trying to fetch all accounts owned by my program using all() method but it is giving me this nasty error:

Uncaught (in promise) ReferenceError: Buffer is not defined
at AccountClient.all

Code:

const accounts = await program.account.user.all();

It works if I try to fetch a single account like this:

const account = await program.account.user.fetch(new PublicKey("..."));

Answer 1

Based on the comment above, it seems that the problem was due to the User account struct being modified in the program after some accounts were already created.

For instance, suppose the User struct was first defined in the following way, and several accounts were created:

#[account]
pub struct User {
pub user: Pubkey,
pub email: String,
}

Then, the program was updated to add a new field to the User struct:

#[account]
pub struct User {
pub user: Pubkey,
pub email: String,
pub name: String,
}

In this scenario, invoking await program.account.user.all() would result in an error because older accounts lack the new field and cannot be deserialized using the updated User struct.