Error with Contract, message: method is not found - rust

Question

I just working with the "Quick-start Guide" in the last part "invoking methods" when i try to call any method always see the error:
Failure [xxxx.testnet]
Error: Contract method is not found
An error occured
Error: Contract method is not found
I have all the methods becase is only copy paste tutorial.
** UPDATE **
I just follow the steps.
Deploy is correct:
near deploy --wasmFile target/wasm32-unknown-unknown/release/rust_counter_tutorial.wasm --accountId josedlujan.testnet
The msg:
Starting deployment. Account id: josedlujan.testnet, node: https://rpc.testnet.near.org, helper: https://helper.testnet.near.org, file: target/wasm32-unknown-unknown/release/rust_counter_tutorial.wasm
Transaction Id 5LiJSuaso4XJ85gYcMopgECgAMvK4BxAHGgfTuGxYHAY
To see the transaction in the transaction explorer, please open this url in your browser
https://explorer.testnet.near.org/transactions/5LiJSuaso4XJ85gYcMopgECgAMvK4BxAHGgfTuGxYHAY
But, when i execute methods.
near call josedlujan.testnet increment --accountId josedlujan.testnet
I always see:
Scheduling a call: josedlujan.testnet.increment()
Receipt: 7GsyvaVGErEr7rXkQdBQSu5F3FRFCQ2BG2LJuDT3t4Gx
Failure [josedlujan.testnet]: Error: Contract method is not found
An error occured
Error: Contract method is not found
But i have the methods lib.rs:
pub fn increment(&mut self) {
// note: adding one like this is an easy way to accidentally overflow
// real smart contracts will want to have safety checks
// e.g. self.val = i8::wrapping_add(self.val, 1);
// https://doc.rust-lang.org/std/primitive.i8.html#method.wrapping_add
self.val += 1;
let log_message = format!("Increased number to {}", self.val);
env::log(log_message.as_bytes());
after_counter_change();
}
/// Decrement (subtract from) the counter.
///
/// In (/src/main.js) this is also added to the "changeMethods" array
/// using near-cli we can call this by:
///
/// ```bash
/// near call counter.YOU.testnet decrement --accountId donation.YOU.testnet
/// ```
pub fn decrement(&mut self) {
// note: subtracting one like this is an easy way to accidentally overflow
// real smart contracts will want to have safety checks
// e.g. self.val = i8::wrapping_sub(self.val, 1);
// https://doc.rust-lang.org/std/primitive.i8.html#method.wrapping_sub
self.val -= 1;
let log_message = format!("Decreased number to {}", self.val);
env::log(log_message.as_bytes());
after_counter_change();
}
lib.rs
//! This contract implements simple counter backed by storage on blockchain.
//!
//! The contract provides methods to [increment] / [decrement] counter and
//! [get it's current value][get_num] or [reset].
//!
//! [increment]: struct.Counter.html#method.increment
//! [decrement]: struct.Counter.html#method.decrement
//! [get_num]: struct.Counter.html#method.get_num
//! [reset]: struct.Counter.html#method.reset
use near_sdk::borsh::{self, BorshDeserialize, BorshSerialize};
use near_sdk::{env, near_bindgen};
near_sdk::setup_alloc!();
// add the following attributes to prepare your code for serialization and invocation on the blockchain
// More built-in Rust attributes here: https://doc.rust-lang.org/reference/attributes.html#built-in-attributes-index
#[near_bindgen]
#[derive(Default, BorshDeserialize, BorshSerialize)]
pub struct Counter {
// See more data types at https://doc.rust-lang.org/book/ch03-02-data-types.html
val: i8, // i8 is signed. unsigned integers are also available: u8, u16, u32, u64, u128
}
#[near_bindgen]
impl Counter {
/// Returns 8-bit signed integer of the counter value.
///
/// This must match the type from our struct's 'val' defined above.
///
/// Note, the parameter is `&self` (without being mutable) meaning it doesn't modify state.
/// In the frontend (/src/main.js) this is added to the "viewMethods" array
/// using near-cli we can call this by:
///
/// ```bash
/// near view counter.YOU.testnet get_num
/// ```
pub fn get_num(&self) -> i8 {
return self.val;
}
/// Increment the counter.
///
/// Note, the parameter is "&mut self" as this function modifies state.
/// In the frontend (/src/main.js) this is added to the "changeMethods" array
/// using near-cli we can call this by:
///
/// ```bash
/// near call counter.YOU.testnet increment --accountId donation.YOU.testnet
/// ```
pub fn increment(&mut self) {
// note: adding one like this is an easy way to accidentally overflow
// real smart contracts will want to have safety checks
// e.g. self.val = i8::wrapping_add(self.val, 1);
// https://doc.rust-lang.org/std/primitive.i8.html#method.wrapping_add
self.val += 1;
let log_message = format!("Increased number to {}", self.val);
env::log(log_message.as_bytes());
after_counter_change();
}
/// Decrement (subtract from) the counter.
///
/// In (/src/main.js) this is also added to the "changeMethods" array
/// using near-cli we can call this by:
///
/// ```bash
/// near call counter.YOU.testnet decrement --accountId donation.YOU.testnet
/// ```
pub fn decrement(&mut self) {
// note: subtracting one like this is an easy way to accidentally overflow
// real smart contracts will want to have safety checks
// e.g. self.val = i8::wrapping_sub(self.val, 1);
// https://doc.rust-lang.org/std/primitive.i8.html#method.wrapping_sub
self.val -= 1;
let log_message = format!("Decreased number to {}", self.val);
env::log(log_message.as_bytes());
after_counter_change();
}
/// Reset to zero.
pub fn reset(&mut self) {
self.val = 0;
// Another way to log is to cast a string into bytes, hence "b" below:
env::log(b"Reset counter to zero");
}
}
// unlike the struct's functions above, this function cannot use attributes #[derive(…)] or #[near_bindgen]
// any attempts will throw helpful warnings upon 'cargo build'
// while this function cannot be invoked directly on the blockchain, it can be called from an invoked function
fn after_counter_change() {
// show helpful warning that i8 (8-bit signed integer) will overflow above 127 or below -128
env::log("Make sure you don't overflow, my friend.".as_bytes());
}
/*
* the rest of this file sets up unit tests
* to run these, the command will be:
* cargo test --package rust-counter-tutorial -- --nocapture
* Note: 'rust-counter-tutorial' comes from cargo.toml's 'name' key
*/
// use the attribute below for unit tests
#[cfg(test)]
mod tests {
use super::*;
use near_sdk::MockedBlockchain;
use near_sdk::{testing_env, VMContext};
// part of writing unit tests is setting up a mock context
// in this example, this is only needed for env::log in the contract
// this is also a useful list to peek at when wondering what's available in env::*
fn get_context(input: Vec<u8>, is_view: bool) -> VMContext {
VMContext {
current_account_id: "alice.testnet".to_string(),
signer_account_id: "robert.testnet".to_string(),
signer_account_pk: vec![0, 1, 2],
predecessor_account_id: "jane.testnet".to_string(),
input,
block_index: 0,
block_timestamp: 0,
account_balance: 0,
account_locked_balance: 0,
storage_usage: 0,
attached_deposit: 0,
prepaid_gas: 10u64.pow(18),
random_seed: vec![0, 1, 2],
is_view,
output_data_receivers: vec![],
epoch_height: 19,
}
}
// mark individual unit tests with #[test] for them to be registered and fired
#[test]
fn increment() {
// set up the mock context into the testing environment
let context = get_context(vec![], false);
testing_env!(context);
// instantiate a contract variable with the counter at zero
let mut contract = Counter { val: 0 };
contract.increment();
println!("Value after increment: {}", contract.get_num());
// confirm that we received 1 when calling get_num
assert_eq!(1, contract.get_num());
}
#[test]
fn decrement() {
let context = get_context(vec![], false);
testing_env!(context);
let mut contract = Counter { val: 0 };
contract.decrement();
println!("Value after decrement: {}", contract.get_num());
// confirm that we received -1 when calling get_num
assert_eq!(-1, contract.get_num());
}
#[test]
fn increment_and_reset() {
let context = get_context(vec![], false);
testing_env!(context);
let mut contract = Counter { val: 0 };
contract.increment();
contract.reset();
println!("Value after reset: {}", contract.get_num());
// confirm that we received -1 when calling get_num
assert_eq!(0, contract.get_num());
}
}
```

Answer 1

I assume you are referring to the Quick-start guide for building smart contracts in Rust?
Let's check a few things to make sure you didn't miss any steps.
Did you create a lib.rs file and copy the contents of this smart contract into that file?
Did you successfully deploy the contract using near-cli after you compiled it to WASM?
Are you invoking the methods using near-cli and replacing YOUR_ACCOUNT_HERE with the testnet accountId you just deployed the contract to?
If so, would you be able to share your code / commands so I can help you debug your issue? This tutorial was updated recently (less than a month from today) so it should work, but while I'm waiting for your response I will run through the steps to make sure we don't have a bug on our end. :)
** UPDATE **
Just went through the tutorial and it worked for me. Here was my command using near-cli:
near call ex-1.testnet increment --accountId ex-1.testnet
And the response:
Scheduling a call: ex-1.testnet.increment()
Receipt: 3UTWH43Tgxy1kSSvoax5cRu8A2VEDKZqzgZaEXTwzsBD
Log [ex-1.testnet]: Increased number to 1
Log [ex-1.testnet]: Make sure you don't overflow, my friend.
Transaction Id 2U92KghmCqihUuURVaLGj8x8FrBhQ5z1vE35BVdZG1ob
To see the transaction in the transaction explorer, please open this url in your browser
https://explorer.testnet.near.org/transactions/2U92KghmCqihUuURVaLGj8x8FrBhQ5z1vE35BVdZG1ob
Feel free to reach out on our Discord for further assistance. The proper channel for this discussion would be #near-sdk-rs under #development but #dev-support is ok too. :)