验证模式，不遵守约束

Question

我有一个问题，即我的架构（对枚举、min 等形式的字段有约束）在我尝试写入数据库时​​没有得到尊重。我创建了一个有错误的对象，但它什么也没说，只是插入了错误的数据。下面是我的代码： 食谱.js：

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

var schema = new Schema({
        name: {type:String, required:true},     
        category_name: [{ type: String, enum: [ "breakfast", "lunch","dinner"], required:true  }],
        difficulty_level: { type: String, enum: [ 'easy', 'medium', 'hard'], required:true },
        time_of_prep: { type: String, enum: [ '<=30 min', '1h-2h', 'more than 2h'], required:true },
        no_of_servings: { type: Number, min:1 , required:true},    
        ingredients_specified: [{
            ingredient:  {type: String, required:true },
                amount:  {type: String, required:true}
        }], 
        description: {type:String, required:true},
        guide: {type:String, required:true}
    });

    module.exports = mongoose.model('Recipe',schema);

recipesSeeder.js：

var Recipe = require('../models/recipes');
var mongoose = require('mongoose');
mongoose.Promise = require('bluebird');
mongoose.connect('pathtodb');
var conn = mongoose.connection;

var recipes=[
    new Recipe({
        name: 'TestName1',
        category_name: 'lunch',
        difficulty_level: 'easy',
        time_of_prep: '<=30min',
        no_of_servings: 5,
        ingredient_specified: {
            ingredient:'banana',
            amount:'2 pieces'
        },
        description: 'description1',
        guide: 'guide1'
    }),
    new Recipe({
        name: ' ',
        category_name: 'testingerrorcat',
        difficulty_level: 'testingerrordiff',
        time_of_prep: 'testingerrortime',
        no_of_servings: 0,
        ingredient_specified: {
            ingredient:'ingredient2',
            amount:'amount2'
        },
        description: 'description2',
        guide: 'guide2'

    }),
    new Recipe({
        name: 'TestName3',
        category_name: 'lunch',
        difficulty_level: 'easy',
        time_of_prep: '<=30min',
        no_of_servings: 5,
        ingredient_specified: {
            ingredient:'ingredient3',
            amount:'amount3'
        },
        description: 'description3',
        guide: 'guide3'
    })
];

var done = 0;
for (var i = 0; i < recipes.length; i++){

     conn.collection('recipes2').save(recipes[i]);
     done++;
    if(done === recipes.length){
              console.log('data inserted');
              exit();
           }
}

function exit() {
    mongoose.disconnect();
}

Answer 1

根据mongoose documentation，验证是一个中间件，默认情况下它被注册为每个模式的 pre('save') 钩子。这意味着当您尝试在其中调用 save 时应用验证，而不是在初始化时应用。此外，您在 conn.collection('recipes2') 上调用 save 而不是模型本身，因此没有进行验证。

正确的方法是调用模型上的验证函数，该函数返回回调。在回调检查错误时，如果没有错误则可以调用模型上的save存储到数据库中。

像这样，我顺便用 for-each 替换了你的 for-loop。

recipes.forEach(function (recipe) {
    recipe.validate(function(err) {
        if (err) {
            console.log(err);//don't save, do something with the error
            return;
        }
        console.log("validation passsed");
        recipe.save();
    });

});

这是我对您的架构所做的修改，以便它知道需要使用哪些集合。

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

 var schema = new Schema({
         name: {type:String, required:true},     
         category_name: [{ type: String, enum: [ 'breakfast', 'lunch','dinner'], required:true  }],
         difficulty_level: { type: String, enum: [ 'easy', 'medium', 'hard'], required:true },
         time_of_prep: { type: String, enum: [ '<=30min', '1h-2h', 'more than 2h'], required:true },
         no_of_servings: { type: Number, min:1 , required:true},    
         ingredients_specified: [{
             ingredient:  {type: String, required:true },
                 amount:  {type: String, required:true}
         }], 
         description: {type:String, required:true},
         guide: {type:String, required:true}
     });

     module.exports = mongoose.model('Recipe',schema, 'recipes2'); //ADDED COLLECTION NAME HERE

话虽如此，在此之后我在您的架构中遇到了小问题，您定义了 '

我在您的代码中看到的另一个问题是，在您的 for 循环中，您正在调用 save，它是异步的。您的代码将调用 save 但不会等待它完成，而是继续前进。 这意味着您可以完成整个循环，然后调用 exit 函数关闭连接，而它实际上还没有保存在数据库中。

我希望它有所帮助。