Sequelize.js 插入具有一对多关系的模型

2022-01-19 00:00:00 sql node.js orm javascript sequelize.js

我有两个具有一对多关系的续集模型.我们称它们为所有者和财产.

I have two sequelize models with one-to-many relationship. Let's call them Owner and Property.

假设它们是使用sails-hook-sequelize 定义的(简化).

Assume they are defined using the sails-hook-sequelize as such (simplified).

//Owner.js
module.exports = {
options: {
  tableName: 'owner'
},
attributes: {
  id: {
    type: Sequelize.BIGINT,
    allowNull: false,
    primaryKey: true,
    autoIncrement: true
  },
  name: {
    type: Sequelize.STRING(255)
  },
  associations: function () {
     Owner.hasMany(Property, {
     foreignKey: {
       name: 'owner_id'
     }
   });
 }
}

//Property.js
module.exports = {
options: {
  tableName: 'property'
},
attributes: {
  id: {
    type: Sequelize.BIGINT,
    allowNull: false,
    primaryKey: true,
    autoIncrement: true
  },
  name: {
    type: Sequelize.STRING(255)
  }
}

现在假设我想在我的数据库中插入一个所有者记录并插入一些属性记录以与所有者关联.我该怎么做呢?

Now assume I want to insert an Owner record in my database and insert a few property records to associate with the owner. How do I do this?

我正在寻找类似的东西

Owner.create({name:'nice owner',
              property: [{name:'nice property'},
                         {name:'ugly property'}]});

令人惊讶的是，我在 Sequelize 文档中找不到这个.

Surprisingly I can't find this in the Sequelize documentation.

推荐答案

您不能在创建所有者时关联属性现有记录，您必须在之后立即使用承诺链.

You can't associate property existing records when you create the owner, you have to do that right after, with promise chain.

Owner.create({name:'nice owner'}).then(function(owner){ 
    owner.setProperties([{name:'nice property'}, {name:'ugly property'}]).then(/*...*/);
});

为避免这些关联出现任何问题(所有者已创建但某些关联失败)，最好使用事务.

To avoid any problems with those associations (owner created but some associations failed), it's better to use transactions.

sequelize.transaction(function(t) {
    return Owner.create({name:'nice owner'}, {transaction: t}).then(function(owner){ 
        return owner.setProperties([{name:'nice property'}, {name:'ugly property'}], {transaction : t});
    });
});

但是，如果您想创建与新属性关联的新所有者，您可以执行类似的操作

However, if you want to create new Owner associated to new Properties you can do something like

Owner.create({
   name: 'nice owner',
   property: [
      { name: 'nice property'},
      { name: 'ugly property'}
   ]
},{
   include: [ Property]
});

参见 http://docs.sequelizejs.com/zh/latest/docs/associations/#creating-with-associations

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