[英]How do I require something from index.js in the same directory?
我有以下文件结构:
models/
index.js
something.js
user.js
在index.js
(这是由Sequalize生成的,从这里导入的东西在其他目录中工作):
'use strict';
var fs = require('fs');
var path = require('path');
var Sequelize = require('sequelize');
var basename = path.basename(module.filename);
var env = process.env.NODE_ENV || 'development';
var config = require(__dirname + '/../config/config')[env];
var db = {};
if (config.use_env_variable) {
var sequelize = new Sequelize(process.env[config.use_env_variable]);
} else {
var sequelize = new Sequelize(config.database, config.username, config.password, config);
}
fs
.readdirSync(__dirname)
.filter(function(file) {
return (file.indexOf('.') !== 0) && (file !== basename) && (file.slice(-3) === '.js');
})
.forEach(function(file) {
var model = sequelize['import'](path.join(__dirname, file));
db[model.name] = model;
});
Object.keys(db).forEach(function(modelName) {
if (db[modelName].associate) {
db[modelName].associate(db);
}
});
db.sequelize = sequelize;
db.Sequelize = Sequelize;
module.exports = db; // <<< I want to import that in something.js
user.js
:
'use strict';
module.exports = (sequelize, DataTypes) => {
const User = sequelize.define('User', {
username: { type: DataTypes.STRING, allowNull: false, unique: true },
password: { type: DataTypes.STRING, allowNull: false },
}, {
classMethods: {
associate() {},
},
});
return User;
};
something.js
:
'use strict';
// this all logs an empty object
console.log(require('./index'));
console.log(require('.'));
console.log(require('./'));
console.log(require('../models'));
console.log(require('../models/'));
console.log(require('../models/index'));
module.exports = (sequelize, DataTypes) => {
const Something = sequelize.define('Something', {
name: DataTypes.STRING,
}, {
classMethods: {
associate(models) {
},
},
});
return Something;
};
如果我从其他目录中的文件中需要db
,它可以工作,所以我猜这不是导出的问题。
我怎样才能在something.js
要求db
,所以它不是未定义的?
const neededStuff = require('./'); // the best
要么:
const neededStuff = require('./index');
要么:
const neededStuff = require('../models/');
原来这是一个循环依赖。 index.js
从something.js
导入东西,然后我尝试在something.js
导入index.js
。
如果模块A在完成设置导出之前需要('B'),然后模块B需要('A'),它将返回一个空对象而不是A可能想要导出的对象。
http://selfcontained.us/2012/05/08/node-js-circular-dependencies/
但是你可以在sequelize使用方法从另一个模型sequelize.models.Something
。
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