javascript - 尝试将表单元素保存到 mongoDB 时无法读取未定义错误的属性

Question

提交表单时出现此错误:

Cannot read property 'firstName' of undefined

在此先感谢伙计们/姑娘们:)

////// NODE CODE //////
var MyUser = mongoose.model( 'users' , { name: String } );

app.post( '/user' , function ( req, res ) {
    var User = new MyUser( {
        name: req.body.firstName
    })
    .save( function ( err, doc ) {
        err ? res.send( err ) : res.redirect( '/' );
    });  
});


/////// MARKUP /////
<form method="POST" action="/user">
    <label>First Name</label>
    <input type="text" name="firstName" /> 
    <button>Submit</button>
</form>

Answer 1

问题是你没有定义好的模式

var MyUser = mongoose.model( 'users' , { name: String } );

您只是将一个简单的对象作为第二个参数传递，该对象必须是Schema 实例。

所以它会像

var userSchema = new mongoose.Schema({
  name: String 
});
var MyUser = mongoose.model( 'users' , userSchema );

这也行:

var MyUser = mongoose.model( 'users' , new mongoose.Schema({name: String}));

Here are some documentation on how to define a mongoose model