truffle-contract: cannot test method before real consume ether method

Question

I am using truffle-contract for connecting between frontend and smart contract. Currently, I can call method on smart contract and can consume ether successfully.

const result = await instance.adoptCreeptomas(
aquaQuantity,
firaQuantity,
aetherQuantity,
gaiaQuantity,
referrer,
{ from: accountAddress, value: ether(sendingEther) }

);

But before that, I want to test method first. So I move to this method:

 const data = await instance.adoptCreeptomas.call(
    aquaQuantity,
    firaQuantity,
    aetherQuantity,
    gaiaQuantity,
    referrer,
    { from: accountAddress, value: ether(sendingEther) }
  );

But when calling this, I meet following exception:

errors.js:38 Uncaught (in promise) Error: Invalid JSON RPC response: {"id":6,"jsonrpc":"2.0","error":{"code":-32603}}

I am using ganache for local blockchain and metamask for provider. Please help me figure out why.

Thanks

Answer 1

Please check out the difference between transaction and call.

The syntax .call() in truffle-contract is explicitly for making a call, while the syntax of direct call with the method name:

We called the abstraction's sendCoin function directly. This will result in a transaction by default (i.e, writing data) instead of call.

I can tell from your method signature that adoptCreeptomas does persist some change to the network. So just get rid of .call and see what happens.