Sequelize.js 为什么不使用model associate创建外键
我在下面列出了一个关系,一家公司有多个分支机构: index.js:Sequelize.js 为什么不使用model associate创建外键,sequelize.js,Sequelize.js,我在下面列出了一个关系,一家公司有多个分支机构: index.js: '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 || 'developme
'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.json')[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;
companies.js
'use strict';
module.exports = function(sequelize, DataTypes) {
var companies = sequelize.define('companies', {
companyId: {
type: DataTypes.UUID,
primaryKey: true
},
companyName: DataTypes.STRING(50)
}, {
classMethods: {
associate: function(models) {
companies.hasMany(models.branches, {
foreignKey: 'branchId'
});
}
}
});
return companies;
};
Branchs.js:
'use strict';
module.exports = function(sequelize, DataTypes) {
var branches = sequelize.define('branches', {
branchId: {
type: DataTypes.UUID,
primaryKey: true
}
}, {
classMethods: {
associate: function(models) {
branches.belongTo(models.companies, {
onDelete: "CASCADE",
foreignKey: 'companyId'
});
}
}
});
return terminals;
};
当I
model.sync()
时,不会创建外键关系。如果您使用的是4.0或更高版本,则它们会更改如何在模型中定义关联。这是一篇很棒的文章,重点介绍了一些变化,包括本期中提到的变化
例如,您的branchs.js文件应该如下所示:
'use strict';
module.exports = function(sequelize, DataTypes) {
var branches = sequelize.define('branches', {
branchId: {
type: DataTypes.UUID,
primaryKey: true
}
});
branches.associate = (models) => {
branches.belongTo(models.companies, {
onDelete: "CASCADE",
foreignKey: 'companyId'
});
}
return branches;
};
是的,在你发布之前,我正在尝试,我会检查它是否有效。我更新了我的答案,但你也返回了终端,而不是原来帖子中的分支。