Not understanding overwrite syntax?

[Atomzwieback]

Hi,

i do not quiet understand the overwrite syntax: https://docs.ethers.io/v5/api/contract/contract/

contract.METHOD_NAME( ...args [ , overrides ] )

my code:

var options = { gasPrice: 3000000, gasLimit: 210000};
const tx = await contact.swapExactTokensForTokens(
        amountIn,
        amountOutMin,
        [tokenIn, tokenOut],
        addresses.recipient,
        Date.now() + 1000 * 60 * 10, // 10 minutes
        options`
 );

const receipt = await tx.wait();

As i understand i have to pass them as last value as object or im wrong? Because atm my code throws no error but also stuck there. I took a look at the pending transactions in the testnet and there is no so i guess my transaction did not arrived there. If i do no override it tells me to set it because it could not etstimated.

I searched already and found this:
#40

but not help me so may someone has a hint for me?

[zemse]

The overrides allow you to supply custom settings. You can find list of overrides here.

For example if you want to use a custom gas price instead of default value.

const tx = await contact.swapExactTokensForTokens(
        amountIn,
        amountOutMin,
        [tokenIn, tokenOut],
        addresses.recipient,
        Date.now() + 1000 * 60 * 10, // 10 minutes
        {
            gasPrice: ethers.utils.parseUnits('120', 'gwei')
        }
 );

If i do no override it tells me to set it because it could not estimated.

Oh, if it gives you an error that goes like cannot estimate gas price, then it is likely that your transaction is failing with a revert. As a guess, are you sure that your account has enough amountIn tokens balance as well as approved?

[Atomzwieback]

i could solve a part of the problem my transaction now recives on the blockchain but now i get this error:

Fail with error 'TransferHelper: TRANSFER_FROM_FAILED'

reason: 'transaction failed',
code: 'CALL_EXCEPTION',

Not sure right now why it now fails after it reaches the chain

[zemse]

TRANSFER_FROM_FAILED means your wallet address doesn't have enough amountIn in tokenIn denomination. Can you verify that?

[Atomzwieback]

I understand what i means now because im using another method that seems working better.

I use the following function:

'function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)',

I facing two problems.

i cant set directly a ETH value to put in in the function call. So if i set none i get

" Fail with error 'PancakeLibrary: INSUFFICIENT_INPUT_AMOUNT'"

and it is because i provided no value but if i try to provide a value in the overwrite options like:

var options = { gasPrice: ethers.utils.parseUnits(gasPrice.fast, "gwei"), gasLimit: 210000, nonce: oldNonce, value: ethers.utils.parseUnits('0.004', 'ether')};

Then i recive an error that i can not provide value to a "non-payable method"

  reason: 'non-payable method cannot override value',
  code: 'UNSUPPORTED_OPERATION',

But in the code the function is declared as "payable"

Function code:

function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        virtual
        override
        payable
        ensure(deadline)
        returns (uint[] memory amounts)
    {
        require(path[0] == WETH, 'PancakeRouter: INVALID_PATH');
        amounts = PancakeLibrary.getAmountsOut(factory, msg.value, path);
        require(amounts[amounts.length - 1] >= amountOutMin, 'PancakeRouter: INSUFFICIENT_OUTPUT_AMOUNT');
        IWETH(WETH).deposit{value: amounts[0]}();
        assert(IWETH(WETH).transfer(PancakeLibrary.pairFor(factory, path[0], path[1]), amounts[0]));
        _swap(amounts, path, to);
    }

So im not sure why i cant provide a value?