Solidity Error: Struct containing a (nested) mapping cannot be constructed

Question

我的 solc 版本：

    "solc": "^0.7.1",

当我尝试构造一个包含映射的结构时，出现了这个错误： “无法构造包含（嵌套）映射的结构”

这是我的 solidity 代码。

Campaign.sol

contract Campaign {
struct Request {
    ...
// I guess this might cause an error
    mapping(address => bool) approvals;

}

constructor(uint256 minimum, address creator) {
    ...
}

function createRequest(
    string memory description,
    uint256 value,
    address payable recipient
) public onlyManager {
    Request memory newRequest = Request({ 
        // Here the compiler complains 
    });
}
...

如果我想在我的 Request 结构中放置一个映射，还有其他方法吗？谢谢

Answer 1

我想我找到了答案here

我将映射放在 struct 之外，错误消失了：

contract Campaign {
    struct Request {
        //...
    }
    mapping(address => bool) approvals;

我不确定它能否完全解决问题。如果还有其他问题，我会更新。

Answer 2

从 0.7.0 开始按如下操作：

    struct Request{
            string description;
            uint value;
            address recipient;
            bool complete;
            uint approvalsCount;
            mapping(address => bool) approvals;
        }
        
    uint numRequests;
    mapping (uint => Request) requests;
    
    function createRequest (string memory description, uint value,
            address recipient) public{
                Request storage r = requests[numRequests++];
                r.description = description;
                r.value = value;
                r.recipient = recipient;
                r.complete = false;
                r.approvalsCount = 0;
            
        }

Solidity Error: Struct containing a (nested) mapping cannot be constructed

Solidity Error: Struct containing a (nested) mapping cannot be constructed

compilation

ethereum

solidity