我将猫鼬与 koa.js 一起使用（可能是一个糟糕的选择，但必须坚持下去）。我最初的回调函数是：
var _project = yield parse(this);
var userdetails = this.req.user;
var that = this ;
//=============================================================
//FInd a user , check the project name exists under the user, if not then create one
//=============================================================
User.findOne({ '_id': userdetails._id }, function (err, user) {
if (err) {
this.body = "please login again , your session seems to have expired"
} console.log(user.projects.owner.indexOf(_project.name));
if(user.projects.owner.indexOf(_project.name) == -1) { //This means the project is not yet created
var temp_project = new Project(_project);
temp_project.save(function save() {
if(err) {
that.body = "Project coudn't be saved, Please try again sometime later";
} else {
user.projects.owner.push(_project.name);
user.save(function save() {
if (err) {
that.body = "This error is highly unlikely, yet if you see this .Please report this issue";
}
});
that.body = temp_project;
}
});
}
if(user.projects.owner.indexOf(_project.name) >= 0) { //THis means the project exists
that.body = "You have already created a project with same name, please use a different name";
console.log("you reached till here");
}
});
这应该在正常的快递世界中有效，但后来我意识到我需要以 thunk 的形式重写，所以我目前的尝试是
function userfindONE(err, user) {
if (err) {
return "please login again , your session seems to have expired"
}
if(user.projects.owner.indexOf(tproject.name) == -1) { //This means the project is not yet created
var temp_project = new Project(tproject);
temp_project.save(function save() {
if(err) {
return "Project coudn't be saved, Please try again sometime later";
} else {
user.projects.owner.push(tproject.name);
user.save(function save() {
if (err) {
return "This error is highly unlikely, yet if you see this .Please report this issue";
}
});
return temp_project;
}
});
}
if(user.projects.owner.indexOf(tproject.name) >= 0) { //THis means the project exists
return "You have already created a project with same name, please use a different name";
} else return "nothing is matching";
}
function userfindone(userdetails) {
return function(cb) {
User.findOne({ '_id': userdetails._id }, cb);
};
}
var userdetails = this.req.user;
var tproject = yield parse(this);
但这会从第一个 mongoose 调用的 User.findone 中返回用户详细信息。其他任何事情似乎都被忽略了。谢谢
this.body = yield userfindone(userdetails)(userfindONE) ;