Sending value to a solidity contract method from web3 results in `Invalid Tuple Value` error

Question

I'm sending values to a solidity 0.5.1 method using web3 and keep getting an invalid Tuple value error.

Here's the relevant contract code:

struct mystruct {
    bytes32 id; 
    string str;
}

mapping (bytes32 => mystruct) structs;

function creatMyStruct(bytes32 id, string memory str) public {
    mystruct memory newStruct = mystruct(id, str);
    structs[id] = newStruct;
}

I'm calling this from node.js:

contract.methods.creatMyStruct(someId, someString).send({from: fromAccount, gas: gasEstimate})
    .then(receipt => {
       var txhash = receipt.transactionHash;
       resolve(txhash);
    },
    (error) => {
        reject(error);
    }).catch((err) => {
         reject(err);
    });

I tried sending a string, a number, and converting the string to hex. The same error: invalid tuple value. What am I missing?

EDIT: here are some of the values I tried for id, which is the one that causes the problem. The string values below were tried when the id value was defined as a string in the contract, and the numeric ones when it was defined as bytes32. I can use both, so a solution for either one would be great.

let id = '123'; 
id = "hello"; 
id = '0xabca00000000000000000000000000';
id = 0xabca00000000000000000000000000;
id = 1;
id = 12300000000000000000000000000000;
id = 'hello';

I tried both as is, or by converting to hex:

userId = web3.utils.asciiToHex(userId);

The same error is generated for all of them. Here's a bit more description in the error:

reason: 'invalid tuple value',
code: 'INVALID_ARGUMENT',
coderType: 'tuple',
value: '0x68656c6c6f' 

Answer 1

As you define the input parameter to be bytes32, the function expects a specific length of bytes to be valid. You would need to pad your input to 32 bytes.

E.g. id = '0xabca00000000000000000000000000'; shall be id = '0xabca000000000000000000000000000000000000000000000000000000000000';