成员 "push" 在参数相关查找后未找到或不可见

Question

问题
此行似乎有一些问题 family.People.push(people[x]);

当我尝试使用 brownie 进行编译时，我一直收到 Member "push" not found or not visible after argument-dependent lookup。

我尝试了什么
我看到一些有类似异常的 SO 帖子，但它与类型转换有关。我确实尝试将我的传入数组转换为它的类型，但它只会导致更多异常。

代码

pragma solidity ^0.8.9;

contract Person{
    string public FirstName;
    string public LastName;
}

contract Family{
    Person[] public People;
}

contract FamilyManager{
    Family[] Families;

    function AddFamily(Person[] memory people) public {
        Family family = new Family();
        for(uint x; x < people.length; x++){
            family.People.push(people[x]);
        }
        Families.push(family);
    }

    function GetFamilies() public view returns (Family[] memory){
        return Families;
    }
}

任何人都可以发现我在这里做错了什么或 link 一篇可以找到答案的文章吗？

Answer 1

我认为这与access modifiers有关。对数组使用 public 修饰符只会为其生成 getter 函数，而不是 setter。因此，您不能直接从另一个合约推送到数组。我创建了一个 public 函数来向数组添加元素，如下所示：

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

contract Person{
    string public FirstName;
    string public LastName;
}

contract Family{
    Person[] public People;

    function addPerson(Person person) public {
        People.push(person);
    }
}

contract FamilyManager{
    Family[] Families;

    function AddFamily(Person[] memory people) public {
        Family family = new Family();
        for(uint x; x < people.length; x++) {
            family.addPerson(people[x]);
        }
        Families.push(family);
    }

    function GetFamilies() public view returns (Family[] memory){
        return Families;
    }
}

成员 "push" 在参数相关查找后未找到或不可见

Member "push" not found or not visible after argument-dependent lookup

ethereum

solidity

smartcontracts