我正在创建一个智能合约,旨在提供一种值得信赖的方式来完成项目,但我遇到了一些问题。
到目前为止,有三个主要功能:createProject(),joinProject()和SubmitProject()
我的项目结构如下:
//Project Model
struct project{
uint pid;
address clientAddr;
string name;
uint bidAmount;
string description;
uint deadline; //record unix timestamp
address freelancerAddr;
bool isOpen;
bool isSubmitted;
bool isAccepted;
}
现在我用客户地址创建一个项目:
function createProject( uint _pid, string memory _name,
string memory _description,
uint _deadline) OnlyClient public payable{
require(msg.value >= 50,"insufficient funds");
project storage prj = projects[_pid];
prj.pid = _pid;
prj.clientAddr = msg.sender;
prj.name = _name;
prj.bidAmount = msg.value;
prj.description = _description;
prj.deadline = _deadline;
prj.isOpen = true;
prj.isSubmitted = false;
prj.isAccepted = false;
projectIDs.push(_pid) -1;
listProjects.push(_name) -1;
emit LogRegisterProject(_pid, prj.clientAddr, _name, prj.bidAmount, _description, _deadline, prj.isOpen);
}
但是freelanceAddr字段仍然为空。仅当自由职业者加入项目时,才通过以下函数初始化它的值:
function joinProject (uint _pid, address _freelancerAddr) OnlyFreelancer public {
require(projects[_pid].isOpen=true,"Project is not open yet");
projects[_pid].isOpen = false;
projects[_pid].freelancerAddr = _freelancerAddr;
emit LogJoinProject(msg.sender, _pid);
}
现在,我要提交项目。但是在执行此操作之前,我要检查调用joinProject的人和尝试调用SubmitProject的人是否是同一个人。因此,我尝试执行以下操作:
function submitProject(uint _pid, address _freelancerAddr) OnlyFreelancer public{
require(projects[_pid].freelancerAddr = msg.sender, "You haven't joined the project");
projects[_pid].isSubmitted = true;
}
但是它给了我TypeError:依赖于参数的查找后没有匹配的声明。
但是,我在加入项目后运行getProjectDetails()函数时看到更改已保存,并且所有状态也已保存。但是在将该值转移到submitProject()中的关联调用时遇到问题。
我已经看到Solidity不允许“空”初始化,那么我该怎么做才能解决此错误,或者有什么替代方法可以进行验证?
好像是一个较小的语法错误。
我一直在做:
require(projects[_pid].freelancerAddr = msg.sender, "You haven't joined the project");
但是,应该有“ ==”。:
require(projects[_pid].freelancerAddr = msg.sender, "You haven't joined the project");
我对Solidity还是很陌生,并且已经在其他类似的比较中使用了单个“ =”,所以就一直这样做。