UnimplementedFeatureError: Copying of type struct {ContractName.StructName} memory[] memory to storage not yet supported - storage

Question

・I want to create the lottery contract that user can buy some lottery numbers.
And, if the lottery was finished, I want to initialize it to create a new lottery.
That's why we implemented it this way.
lotChances = new LotChance[](0);
But, I faced this is error ...👇
UnimplementedFeatureError: Copying of type struct Lottery.LotChance memory[] memory to storage not yet supported.
Minimal example:
contract Lottery {
// Lot Structs
struct LotChance {
address payable userAddress;
uint256 ids;
}
LotChance[] public lotChances;
function getResult() public onlyOwner {
luckyPerson.transfer(address(this).balance);
lotteryId++;
lotChances = new LotChance[](0);
}
}
Please advise me😌

Answer 1

For reset an array and set his values to default you can use delete keyword in Solidity. In your case, you must to change your getResult() function in this way:
function getResult() public onlyOwner {
luckyPerson.transfer(address(this).balance);
lotteryId++;
delete lotChances;
}
You can see an example of smart contract code, here following:
// SPDX-License-Identifier: MIT
pragma solidity 0.8.7;
contract Lottery {
address owner;
constructor() {
owner = msg.sender;
}
// Lot Structs
struct LotChance {
address payable userAddress;
uint256 ids;
}
modifier onlyOwner() {
require(msg.sender == owner, "You aren't smart contract owner!");
_;
}
LotChance[] public lotChances;
function getResult(address _luckyPerson) public onlyOwner {
uint lotteryId = 0;
payable(_luckyPerson).transfer(address(this).balance);
lotteryId++;
// I reset array length about to '0'
delete lotChances;
}
function partecipateToLottery(uint _id) public {
lotChances.push(LotChance(payable(msg.sender), _id));
}
function getLengthArray() external view returns(uint) {
return lotChances.length;
}
}