Fallback functions
To create a contract which can receive eth via the .send() method, you need to declare a fallback function in your contract.
It's pretty easy to do this by simply creating a payable function with no name in your contract like this:
// @notice Will receive any eth sent to the contract
function () external payable {
}
If you want to do anything with the funds inside a payable function you can use the msg.sender and msg.value variables to work out who and how much was sent.
Full example:
pragma solidity ^0.4.19;
/// @title An example contract that demonstrates making a payment via the send function
contract Test {
/// @notice Logs the address of the sender and amounts paid to the contract
event Paid(address indexed _from, uint _value);
/// @notice Any funds sent to this function will be unrecoverable
/// @dev This function receives funds, there is currently no way to send funds back
function () external payable {
Paid(msg.sender, msg.value);
}
}
Output:
When the above contract is compiled, created and send funds, you get the following output:
truffle(develop)> Test.new().then(c => c.send(10, {from: '0x627306090abab3a6e1400e9345bc60c78a8bef57'}).then(tx => {console.log(tx.tx); tx.logs.length && console.log(tx.logs[0].event, tx.logs[0].args)}))
0x911ceb59724001b3cb99a035281745b4af5b02a10a1c79906b4c527f8c462db8
Paid { _from: '0x627306090abab3a6e1400e9345bc60c78a8bef57',
_value: BigNumber { s: 1, e: 1, c: [ 10 ] } }
Best Answer
As per the documentation for Truffle Develop:
If you're using Ganache, you can change the number of addresses using the "Total accounts to generate" option under the "Accounts and Keys" settings.