Node.js ORM2 检查字段是不是已存在

Posted 2023-04-12

【中文标题】Node.js ORM2 检查字段是不是已存在

【英文标题】：Node.js ORM2 check if field already existsNode.js ORM2 检查字段是否已存在

【发布时间】：2014-01-18 17:10:44

【问题描述】：

检查字段值是否已存在的最佳方法是什么。

这是我的模型：

// Set global
var moment = require('moment');
var _  = require('lodash');

// Create model
module.exports = function (orm, db) 

    var Profile = db.define('profile', 
        // Field Properties
        
            username: type: 'text', required: true, unique: true,
            name: type: 'text', required: true,
            email: type: 'text', required: true,
            password: type: 'text', required: true,
            birthday: type: 'date', required: true,
            gender: type: 'enum', values: ["male", "female"], required: true,
            join_date: type: 'date'
        ,
        
            // Model hooks. Manual: https://github.com/dresende/node-orm2/wiki/Model-Hooks
            hooks: 

                beforeValidation: function() 

                    // Set join date to current date
                    this.join_date = new Date();
                
            ,

            // Model Validations. Manual: https://github.com/dresende/node-orm2/wiki/Model-Validations
            validations: 
                username: [orm.enforce.security.username(length: 4, 'Invalid username')],
                email: [orm.enforce.patterns.email('Please enter a valid email')],
                password: [orm.enforce.security.password('6', 'Invalid password')],
                birthday: [orm.enforce.patterns.match(/\d2-\d2-\d4/, null, 'Invalid birthday')]
            ,

            // Model methods. Extra functions and stuff
            methods: 

            
    );
;

这是我的注册控制器：

module.exports = function (req, res, next) 

    // Get post params
    var params = _.pick(req.body, 'formAction', 'username', 'password', 'email', 'confirm_password',
                            'birthday', 'gender', 'terms');

    // If we try to register
    if (params['formAction'] == 'register') 

        // Manual validations
        // Check if we agreed with the terms
        if (params['terms'] != 1) 

            res.send(error: 'You must agree to the terms of service');
            return false;   
        

        // Check if password was confirmed
        if (params['password'] && params['password'] != params['confirm_password']) 

            res.send(error: 'Please confirm your password');
            return false;
        

        // Check if username already exists


        // Try to register
        req.models.profile.create(username: params['username'], 
                                   password: params['password'],
                                   email: params['email'],
                                   birthday: params['birthday'], 
                                   gender: params['gender'],
                                   name: params['username'], function (err, items) 

                                       // Check to see if we have error
                                       error = helpers.getError(err);

                                       // Return error
                                       if (error)
                                           res.send(error: error);
                                   );
    
    // Show login form
    else
        res.sendfile(settings.path + '/public/register.html');
;

如何检查数据库中是否已经存在用户名？现在，如果我尝试创建，我会从数据库中得到 DUP_KEY 错误。

谢谢， 拉度

【参考方案1】：

看起来像添加一个钩子并使用 next() 解决了

beforeCreate: function (next) 

                    obj = this;
                    Profile.exists(email: this.email, function (err, exists) 
                        if (exists) 
                            return next(new Error("Email already exists"));
                        
                        else
                        
                            Profile.exists(username: obj.username, function (err, exists) 
                                console.log(exists);
                                if (exists) 
                                    return next(new Error("Username already exists"));
                                
                                else
                                    return next();
                            );
                        
                    );