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问题描述
我正在为我的 node.js 应用程序使用 sequelize ORM，并创建了两个简单的模型.
I am using sequelize ORM for my node.js application and have created two simple models.
- company.model.js
- location.model.js
一家公司可以有多个地点，一个地点可以属于一个公司.
A company can have multiple locations and a location can belongs to one company.
这是我的模型:
company.model.js
'use strict';
module.exports = function(sequelize, DataTypes) {
var Company = sequelize.define('Company', {
id: {
type: DataTypes.INTEGER(3),
allowNull: false,
primaryKey: true,
autoIncrement: true,
comment: "Primary and auto incremented key of the table"
},
companyName: {
field: "company_name",
type: DataTypes.STRING(255),
allowNull: false,
comment: "Company Name"
},
companyCode: {
field: "company_code",
type: DataTypes.STRING(20),
allowNull: false,
unique: true,
comment: "Company Code"
},
contactName: {
field: "contact_name",
type: DataTypes.STRING(100),
allowNull: true,
comment: "Name of contact person"
},
contactNo: {
field: "contact_no",
type: DataTypes.STRING(20),
allowNull: true,
comment: "Company contact number"
},
fax: {
field: "fax",
type: DataTypes.STRING(20),
allowNull: true,
comment: "Company fax number"
},
website: {
field: "website",
type: DataTypes.STRING(50),
allowNull: true,
comment: "Company website url if exist for e.g. mumbai.spiderman.com",
validate: {
isUrl: true
}
},
country: {
field: "country_id",
type: DataTypes.INTEGER(3),
allowNull: false,
comment: "Country for address purpose"
},
state: {
field: "state_id",
type: DataTypes.INTEGER(4),
allowNull: true,
comment: "State for address purpose"
},
city: {
field: "city_id",
type: DataTypes.INTEGER(5),
allowNull: true,
comment: "City for address purpose"
},
landmark: {
field: "landmark",
type: DataTypes.STRING(255),
allowNull: true,
comment: "Address landmark"
},
address: {
field: "address",
type: DataTypes.TEXT,
allowNull: true,
comment: "Company address"
},
status: {
field: "status",
type: DataTypes.ENUM('ACTIVE','INACTIVE','DELETED'),
allowNull: false,
defaultValue: 'ACTIVE',
comment: "Wether a company is active, inactive or deleted"
}
},{
underscored: true,
freezeTableName:true,
tableName:'company',
classMethods:{
associate:function(models){
Company.hasMany(models.Location);
}
},
});
return Company;
};
location.model.js
'use strict';
module.exports = function(sequelize, DataTypes) {
var Location = sequelize.define('Location', {
id: {
type: DataTypes.INTEGER(5),
allowNull: false,
primaryKey: true,
autoIncrement: true,
comment: "Primary and auto incremented key of the table"
},
locationType: {
field: "location_type",
type: DataTypes.ENUM('HEAD_OFFICE','REGIONAL_OFFICE','FRANCHISE'),
allowNull: false,
comment: "Type of location"
},
locationName: {
field: "location_name",
type: DataTypes.STRING(200),
allowNull: false,
comment: "Name of location"
},
locationCode: {
field: "location_code",
type: DataTypes.STRING(20),
allowNull: false,
unique: true,
comment: "Location Code"
},
contactName: {
field: "contact_name",
type: DataTypes.STRING(100),
allowNull: true,
comment: "Name of contact person"
},
contactNo: {
field: "contact_no",
type: DataTypes.STRING(20),
allowNull: true,
comment: "Location contact number"
},
fax: {
field: "fax",
type: DataTypes.STRING(20),
allowNull: true,
comment: "Location fax number"
},
website: {
field: "website",
type: DataTypes.STRING(50),
allowNull: true,
comment: "Location specific website url if exist for e.g. mumbai.spiderman.com",
validate: {
isUrl: true
}
},
country: {
field: "country_id",
type: DataTypes.INTEGER(3),
allowNull: false,
comment: "Location country for address purpose"
},
state: {
field: "state_id",
type: DataTypes.INTEGER(4),
allowNull: true,
comment: "Location state for address purpose"
},
city: {
field: "city_id",
type: DataTypes.INTEGER(5),
allowNull: true,
comment: "Location city for address purpose"
},
landmark: {
field: "landmark",
type: DataTypes.STRING(255),
allowNull: true,
comment: "Location landmark"
},
address: {
field: "address",
type: DataTypes.TEXT,
allowNull: true,
comment: "Location address"
},
status: {
field: "status",
type: DataTypes.ENUM('ACTIVE','INACTIVE','DELETED'),
allowNull: false,
defaultValue: 'ACTIVE',
comment: "Weather a location is active, inactive or deleted"
},
createdBy: {
field: "created_by",
type: DataTypes.INTEGER(11),
allowNull: true,
comment: "User ID who created this location"
},
updatedBy: {
field: "updated_by",
type: DataTypes.INTEGER(11),
allowNull: true,
comment: "User ID who updated this location"
}
},
{
timestamps: true,
underscored: true,
freezeTableName:true,
tableName:'location',
defaultScope: {
where: {
status: 'ACTIVE'
}
},
classMethods:{
associate:function(models){
Location.belongsTo(models.Company, { foreignKey:'company_id', foreignKeyConstraint:true} );
}
}
});
return Location;
};
现在我预计它会 sequelize.sync({force:true}) 将创建两个表并向位置表添加外键索引.但它只是创建表.位置表中没有任何名为 company_id 的列.
Now I expected that It will sequelize.sync({force:true}) will create both tables and add a foreign key index to the location table. But it is only create tables. There is no any column named company_id on location table.
推荐答案
通过在 sequelize 的单例模块中编写几行代码，我自己解决了问题:
Resolved the problem at my own by writing the few lines of code in my singleton module of sequelize:
Object.keys(db).forEach(function(modelName) {
if(db[modelName].hasOwnProperty('associate')) {
db[modelName].associate(db);
}
});
代码将遍历所有模型并直接调用它们的关联方法，因为它们已被定义为 classMethods.
The code will iterate over all the models and call their associate methods directly as they have been defined as classMethods.
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