有没有办法与直通表进行多态自我关联(例如,集合有并且属于许多集合)?
尝试使http://docs.sequelizejs.com/manual/tutorial/associations.html#n-m适应这种情况:
// Inside collection.js associate
Collection.belongsToMany(Collection, {
through: {
model: models.CollectionItem,
unique: false,
scope: {
collectible: 'collection'
}
},
foreignKey: 'collectibleUid',
constraints: false
});
collectionItem.js
看起来像
const CollectionItem = sequelize.define("CollectionItem", {
uid: {
type: DataTypes.BIGINT,
primaryKey: true
},
collectionUid: {
type: DataTypes.BIGINT,
allowNull: false,
unique: 'collection_item_collectible'
},
order: {
type: DataTypes.INTEGER,
allowNull: false,
defaultValue: 0
},
collectibleUid: {
type: DataTypes.BIGINT,
allowNull: false,
references: null, // Because the column is polymorphic, we cannot say that it REFERENCES a specific table
unique: 'collection_item_collectible'
},
collectible: {
type: DataTypes.STRING,
allowNull: false,
unique: 'collection_item_collectible'
}
}, {
classMethods: {
}
});
似乎Sequelize希望我通过另一个连接/通过表来区别对待这个名称,但这实际上是创建一个新表而不是获得真正的hasAndBelongsToMany
类型关系。
错误:必须为多对多自我关联定义'as'
答案 0 :(得分:1)
尝试明确并添加:
as: "CollectionItem"
as
不创建新的连接表,只是给关系一个名称