如何在nodejs中訪問控制器中的常量變量

我已經在模型文件中定義了一個常量變量，並在向表中插入數據時嘗試訪問此常量變量，然後顯示未定義變量。我使用了sequlaize ORM和nodejs。我想爲狀態定義三個值，如Active = 1，Inactive = 2，Deleted = 3，還是有其他解決方案來定義它。我正在使用續集ORM 4+版本。如何在nodejs中訪問控制器中的常量變量

Model code is here 

var Sequalize = require('sequelize'); 
var sequalize = require('../../config/db_config'); 

const ACTIVE = '1'; 
const INACTIVE = '2'; 
const DELETED = '3'; 

const User = sequalize.define('user',{ 
    user_id_pk : { 
     type : Sequelize.INTEGER, 
     allowNull : false, 
     primaryKey : true, 
     autoIncrement : true 
    }, 
    user_type : Sequelize.INTEGER, 
    first_name : Sequelize.STRING, 
    middle_name : Sequelize.STRING, 
    last_name : Sequelize.STRING, 
    password : Sequelize.STRING, 
    email : Sequelize.STRING, 
    mobile_no : Sequelize.STRING, 
    is_email_verified : { 
     type:Sequalize.INTEGER, 
     defaultValue : 0 
    }, 
    gender : Sequelize.STRING, 
    profile_image: Sequelize.STRING, 
    dob : Sequelize.DATE, 
    is_active : Sequelize.STRING, 
    created_date : Sequelize.DATE, 
    created_by : Sequelize.INTEGER, 
    updated_date : Sequelize.DATE, 
    updated_by : Sequelize.INTEGER, 
},{ 
    timestamps: false, 
    paranoid: true, 
    underscored: true, 
    freezeTableName: true, 
    tableName: 'user', 
    createdAt:'created_date', 
    updatedAt:'updated_date' 
}); 

User.sync({force:false}).then(() => { 
    console.log('Table is created!');  
}).catch(err => { 
    console.log('An error occur when table is created!'); 
}); 
module.exports = User; 

Controller code is here 

userController.saveUser = function(req,res){ 
    console.log(user.ACTIVE);return false; 
    user.findOrCreate({ 
     where:{ 
      first_name: req.body.first_name, 
      email: req.body.email, 
      boltt_code: req.body.boltt_code 
     }, 
     defaults:{ 
      first_name: req.body.fihhrst_name, 
      middle_name : 'Rajeev', 
      last_name : 'Varshney', 
      email: req.body.email, 
      boltt_code: req.body.boltt_code, 
      is_active : '1', 
     } 
    }) 
    .spread(function(user, created) { 
     var msg = ''; 
     if(created){ 
      msg = 'User inserted successfully!'; 
     }else{ 
      msg = 'User already exist!'; 
     } 
     res.status(200).send({error : false,message : msg2, data : user }); 
    }) 
    .catch((err) => { 
     console.log('Oops something wrong! ' + err); 
    }); 
};

來源

2017-07-28 Rajeev Varshney

這個問題與MySQL有什麼關係？ – axiac

我確定你使用它，但在這個問題中我看不到與MySQL有關的任何東西。你應該刪除MySQL標籤並添加[tag：sequelize.js]標籤。如果仔細觀察，庫的名稱是「Sequelize」，而不是「Sequalize」，因爲您拼錯了它。然後你想知道爲什麼代碼不起作用... – axiac

我的意思是，在代碼中。它充滿了'Sequalize.INTEGER'。即使[Google知道]（https://www.google.ro/search?q=Sequalize.INTEGER）它應該是['Sequelize.INTEGER']（http://docs.sequelizejs.com） – axiac

在ModelCore.js文件導出不僅方便用戶，而且你的常數：

// ModelCore.js 
var Sequalize = require('sequelize'); 
var sequalize = require('../../config/db_config'); 

const ACTIVE = '1'; 
const INACTIVE = '2'; 
const DELETED = '3'; 

const User = sequalize.define('user', {...}); 

module.exports = { 
    User, 
    CODES: { 
     ACTIVE, 
     INACTIVE, 
     DELETED 
    } 
}

現在導入您的ControllerCode.js內：

// ControllerCode.js 
const modelCore = require('./path/to/ModelCore'); 

const user = modelCore.User; 
const {CODES} = modelCore; 

//Using codes now should work 
console.log(CODES.ACTIVE); 
console.log(CODES.INACTIVE); 
console.log(CODES.DELETED); 

// Rest of your Controller code...

來源

2017-07-28 13:06:02

如果你想在同一個文件中使用這些變量，你只需要聲明它們並使用它。如果你想從另一個文件訪問它們，你要導出的變量：

const ACTIVE = '1'; 
const INACTIVE = '2'; 
const DELETED = '3'; 
exports.ACTIVE = ACTIVE; 
exports.INACTIVE = INACTIVE; 
exports.DELETED = DELETED;

現在可以使所需的文件並訪問變量。

來源

2017-07-28 13:07:37 susoPisto

謝謝，這是爲我工作:) –

We can initialize constant variable to model instance after creating the model instance. 

const ACTIVE = 1; 
const INACTIVE = 2; 
const DELETED = 3; 

const user = sequelize.define('user',{..},{ 

}); 

User.ACTIVE = ACTIVE; 
User.INACTIVE = INACTIVE; 
User.DELETED = DELETED; 

module.exports = User;

來源

2017-07-28 13:32:20

如何在nodejs中訪問控制器中的常量變量

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