TypeError: Type tuple() is not implicitly convertible to expected type uint256. userStructs[userAddress].index = userIndex.push(userAddress) - 1;

Question

pragma solidity ^0.6.0;

contract UserCrud{
    struct userStruct{
        uint userAge;
        uint index;
        bytes32 userName;
        bytes32 userEmail;
    }
    mapping(address => userStruct) private userStructs;
    address[] private userIndex;

    function insertUser(
    address userAddress,
    uint userAge,
    bytes32 userName,
    bytes32 userEmail) public returns (uint index) {
        require(!isUser(userAddress));
        userStructs[userAddress].userAge = userAge;
        userStructs[userAddress].userName = userName;
        userStructs[userAddress].userEmail = userEmail;
        userStructs[userAddress].index = userIndex.push(userAddress) - 1; //error in this line
}

I got this code from an article regarding Solidity CRUD and was doing some modifications, but I'm facing an error as follows:

TypeError: Type tuple() is not implicitly convertible to expected type uint256. userStructs[userAddress].index = userIndex.push(userAddress) - 1;

Answer 1

The problems is that since solc v0.6.0 userIndex.push(userAddress) no longer return the length as in previous versions.

You can fix the code with something like this

userIndex.push(userAddress);
userStructs[userAddress].index = userIndex.length - 1;