Ethereum: Cannot call «write» function using ethers.js

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Error: Cannot call a «write» function on an Ethereum contract using Ethers.js

When working with smart contracts on the Ethereum blockchain, it is common to use tools like ethers.js to interact with contract instances. However, there is a crucial step that many developers overlook when creating their first Ethereum contracts using ethers.js: calling methods on the contract instance.

In this article, we will explore why you might encounter an error when trying to call a «write» function on an Ethereum contract using ethers.js and provide guidance on how to resolve it.

Problem:

When declaring a contract instance on your network. local Hardhat using the following code:

cont const0 = "0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80";

Create a new instance of an Ethereum contract. However, ethers.js does not automatically register the contract with the Ethereum network. To interact with a contract on the local Hardhat network, you must call its methods and use the call function in ethers.js.

Workaround:

To fix this issue, you can add the following code before calling any method on the contract instance:

contract = new contract(cont0);

This creates a new contract instance using the provided account address. You will also need to call the call function in ethers.js to execute method calls on the contract instance.

Code example:

Here is an updated example of how you can declare a contract instance and call its methods using ethers.js:

const { ethers } = require("hard hat");
// Define the ABI (Application Binary Interface) contract
const abi = [
{
inputs: [],
stateMutability: "view",
type: "function"
},
{
inputs: ["string", "int", "boolean"],
stateMutability: "write",
type: "function"
}
];
// Create a new contract instance using Hardhat
asynchronous function main() {
account const0 = "0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80";
const contractInstance = await ethers.getContractFactory("YourContractName");
const contract = await contractInstance.deploy(account0);
// Call a method on the contract instance
const result = await contract.methods.yourMethod().call();
console.log(result); // Output: return value
// Delete the contract instance
await contract.destroy();
}
// Run the main function using Hardhat
main();

Conclusion:

In this article, we have highlighted a crucial step in interacting with smart contracts on the Ethereum blockchain using ethers.js. By creating a new contract instance and calling its methods, you can perform various actions on the local Hardhat network.

Don’t forget to update your code accordingly to use the contractInstance variable throughout your function. Happy coding!

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