Question

我正在尝试检查用户是否存在save调用的预挂钩。这是我的模型的架构：

var mongoose    = require('mongoose');
var Schema      = mongoose.Schema;

var empSchema = new Schema({
    name: String,
    img: String,
    info: String,
    mobnum: String,
    email: String,
    likes: [String]
},
{
    collection: "employers"
}
);


empSchema.pre('save', function(next) {
    var self = this;
    empSchema.find({email: self.email}, function(err, docs) {
        if(!docs.length()){
            next();
        }
        else {
            next(new Error("User exists."));
        }
    });
});

module.exports = mongoose.model('Employer', empSchema);

这给了我以下错误：

/home/gopa2000/prog/android_workspace/MobAppsBE/app/models/employer.js:21
    empSchema.find({email: self.email}, function(err, docs) {
              ^

TypeError: empSchema.find is not a function

的package.json：

{
  "name": "tjbackend",
  "version": "1.0.0",
  "description": "REST API for backend",
  "dependencies": {
    "express": "~4.5.1",
    "mongoose": "latest",
    "body-parser": "~1.4.2",
    "method-override": "~2.0.2",
    "morgan": "~1.7.0"
  },
  "engines": {
    "node":"6.4.0"
  }
}

对我的问题可能有什么建议吗？

Answer 1

find()函数属于model，而不属于schema 您需要生成一个模型并在其上运行find：

var mongoose    = require('mongoose');
var Schema      = mongoose.Schema;

var empSchema = new Schema({
    name: String,
    img: String,
    info: String,
    mobnum: String,
    email: String,
    likes: [String]
},
{
    collection: "employers"
}
);

var employer = mongoose.model('Employer', empSchema);

empSchema.pre('save', function(next) {
    var self = this;
    employer.find({email: self.email}, function(err, docs) {
        if(!docs.length()){
            next();
        }
        else {
            next(new Error("User exists."));
        }
    });
});

module.exports = employer;

Model.find（）不是函数ExpressJS

1 个答案: