Error: Querying [object Object] failed: wasm execution failed with error - rust

Question

I am having trouble resolving the error.
I am now trying to get a list of product data stored in a map in vector form.
#[near_bindgen]
#[derive(Serialize, Deserialize, Debug, BorshDeserialize, BorshSerialize)]
#[serde(crate = "near_sdk::serde")]
pub struct Room {
room_id: U64,
name: String,
image: String,
description: String,
location: String,
price: U128,
owner: AccountId,
}
#[near_bindgen]
#[derive(BorshDeserialize, BorshSerialize)]
pub struct Rooms {
pub rooms: UnorderedMap<U64, Room>,
}
impl Default for Rooms {
fn default() -> Self {
Self {
rooms: UnorderedMap::new(b"r".to_vec()),
}
}
}
#[near_bindgen]
impl Rooms {
pub fn set_room(
&mut self,
name: String,
image: String,
description: String,
location: String,
price: U128,
) -> U64 {
let timestamp = env::block_timestamp();
let convert_timestamp: U64 = timestamp.into();
let account_id = env::signer_account_id();
self.rooms.insert(
&convert_timestamp.clone(),
&Room {
room_id: convert_timestamp,
name,
image,
description,
location,
price,
owner: account_id,
},
);
convert_timestamp
}
pub fn get_room(&self, room_id: U64) -> Room {
self.rooms.get(&room_id).expect("No Room")
}
pub fn get_rooms(&self) -> Vec<Room> {
Vec::from_iter(self.rooms.values())
}
}
The error occurs when I call get_rooms.
$ near view dev-1658072311649-16892075058144 get_rooms
View call: dev-1658072311649-16892075058144.get_rooms()
An error occured
Error: Querying [object Object] failed: wasm execution failed with error: FunctionCallError(HostError(GuestPanic { panic_msg: "Cannot deserialize element" })).
{
"block_hash": "54p5pS8xrzi7GWzv5YcgpNT33f7RqYdR7sUzHaTdzsqf",
"block_height": 95181885,
"error": "wasm execution failed with error: FunctionCallError(HostError(GuestPanic { panic_msg: \"Cannot deserialize element\" }))",
"logs": []
}
at JsonRpcProvider.query (/Users/user/.config/yarn/global/node_modules/near-api-js/lib/providers/json-rpc-provider.js:123:19)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at async Account.viewFunction (/Users/user/.config/yarn/global/node_modules/near-api-js/lib/account.js:366:24)
at async exports.callViewFunction (/Users/user/.config/yarn/global/node_modules/near-cli/index.js:98:48)
at async Object.handler (/Users/user/.config/yarn/global/node_modules/near-cli/utils/exit-on-error.js:52:9)
TypedError: Querying [object Object] failed: wasm execution failed with error: FunctionCallError(HostError(GuestPanic { panic_msg: "Cannot deserialize element" })).
{
"block_hash": "54p5pS8xrzi7GWzv5YcgpNT33f7RqYdR7sUzHaTdzsqf",
"block_height": 95181885,
"error": "wasm execution failed with error: FunctionCallError(HostError(GuestPanic { panic_msg: \"Cannot deserialize element\" }))",
"logs": []
}
at JsonRpcProvider.query (/Users/user/.config/yarn/global/node_modules/near-api-js/lib/providers/json-rpc-provider.js:123:19)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at async Account.viewFunction (/Users/user/.config/yarn/global/node_modules/near-api-js/lib/account.js:366:24)
at async exports.callViewFunction (/Users/user/.config/yarn/global/node_modules/near-cli/index.js:98:48)
at async Object.handler (/Users/user/.config/yarn/global/node_modules/near-cli/utils/exit-on-error.js:52:9) {
type: 'UntypedError',
context: undefined
}
Why do I get an error about serialization only when I get the product information as a vector?
All other functions work fine.
If you know the cause and solution, I would like to know.

Answer 1

I just tested your code and it worked fine for me. You can try calling the method in dev-1658147947569-44192518546131.
Make sure you are using the latest near-sdk (4.0), and that you are importing everything from the right place:
use near_sdk::borsh::{self, BorshDeserialize, BorshSerialize};
use near_sdk::{near_bindgen, env, AccountId, collections::{UnorderedMap}};
use near_sdk::json_types::{U64, U128};
use near_sdk::serde::{Serialize, Deserialize};