Sequelize hasMany 通过另一个表

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

好的，所以我有以下三个模型

Okay so i have the following three models

模块:

    var Module = sequelize.define('module', {
        id: DataTypes.INTEGER,
        name: DataTypes.STRING,
        description: DataTypes.STRING,
        category_id: DataTypes.STRING,
        module_type_id: DataTypes.STRING,
        gives_score: DataTypes.INTEGER,
        duration: DataTypes.STRING,
        price: DataTypes.STRING

    }, {
        freezeTableName: true}
)

能力:

Competence = sequelize.define('competence', {
        id: DataTypes.INTEGER,
        name: DataTypes.STRING,
        organization_id: DataTypes.INTEGER,
        competence_type_id: DataTypes.INTEGER
    },{freezeTableName:true})

Module_has_competence:

        Module_has_competence = sequelize.define('module_has_competence', {
    id: DataTypes.INTEGER,
    module_id: DataTypes.INTEGER,
    competence_id: DataTypes.INTEGER,
    score: DataTypes.STRING
},{
    freezeTableName: true}
})

如您所见，表之间的关系是 n:m

As you can see the relation between the tables are an n:m

所以现在我想找到一个 Module 具有的所有 Competence:

So now i want to find all the Competence that a Module has:

所以我创建了以下关系:

So i created the following relationship:

Module.hasMany(Competence, {through: Module_has_competence, foreignKey: 'module_id'});

但是当我尝试运行时:

  retrieveById: function (quote_id, onSuccess, onError) {
                Module.find({include: [{ all: true }],where: {id: quote_id}})
                    .success(onSuccess).error(onError);
            }

它什么也不返回.但是如果我删除它只返回 Module

it returns nothing. But if i delete the relationship it returns only the Module

谁能告诉我我做错了什么?

Can anyone tell me what i am doing wrong?

当我调试时

当我调试它时，它没有记录任何 sql，可悲的是它似乎只是忽略了 sql 调用?

When i debug it does not log any sql sadly it seems it is just ignoring the sql call ?

推荐答案

据我了解，您创建的表是多对多关系，当您查询模块"时，您需要所有能力"相关联.

From my understanding, the tables you've created a many to many relationship and that when you query for a "Module", you want all the "Competence" associated to it.

虽然我无法让 .hasMany() 工作，但产生的错误是:

Though I wasn't able to get .hasMany() working, the error produced was:

Trace: [TypeError: Cannot call method 'replace' of undefined]
    at null.<anonymous> (/Users/sjlu/Development/29165644/app.js:61:13)
    at tryCatch1 (/Users/sjlu/Development/29165644/node_modules/sequelize/node_modules/bluebird/js/main/util.js:45:21)
    at Promise._callHandler (/Users/sjlu/Development/29165644/node_modules/sequelize/node_modules/bluebird/js/main/promise.js:571:13)
    at Promise._settlePromiseFromHandler (/Users/sjlu/Development/29165644/node_modules/sequelize/node_modules/bluebird/js/main/promise.js:581:18)
    at Promise._settlePromiseAt (/Users/sjlu/Development/29165644/node_modules/sequelize/node_modules/bluebird/js/main/promise.js:713:18)
    at Promise._settlePromiseAt (/Users/sjlu/Development/29165644/node_modules/sequelize/lib/promise.js:76:18)
    at Promise._settlePromises (/Users/sjlu/Development/29165644/node_modules/sequelize/node_modules/bluebird/js/main/promise.js:854:14)
    at Async._consumeFunctionBuffer (/Users/sjlu/Development/29165644/node_modules/sequelize/node_modules/bluebird/js/main/async.js:85:12)
    at Async.consumeFunctionBuffer (/Users/sjlu/Development/29165644/node_modules/sequelize/node_modules/bluebird/js/main/async.js:40:14)
    at process._tickCallback (node.js:442:13)

这个输出几乎不可能调试.

In which this output is almost impossible to debug.

但是，我能够创建您的模型绑定并使用 .belongsToMany() 关联正确查询它

However, I was able to create your model bindings and query it correctly with the .belongsToMany() associations

Competence.belongsToMany(Module, {
    through: Module_has_competence,
    as: 'module',
    foreignKey: 'module_id'
})
Module.belongsToMany(Competence, {
    through: Module_has_competence,
    as: 'competence',
    foreignKey: 'competence_id'
})

输出您正在寻找的查询

  SELECT `module`.`id`, 
         `module`.`name`, 
         `module`.`description`, 
         `module`.`category_id`, 
         `module`.`module_type_id`, 
         `module`.`gives_score`, 
         `module`.`duration`, 
         `module`.`price`, 
         `module`.`createdat`, 
         `module`.`updatedat`, 
         `competence`.`id`                                  AS `competence.id`, 
         `competence`.`name`                                AS `competence.name`, 
         `competence`.`organization_id`                     AS 
         `competence.organization_id`, 
         `competence`.`competence_type_id`                  AS 
         `competence.competence_type_id`, 
         `competence`.`createdat`                           AS 
         `competence.createdAt`, 
         `competence`.`updatedat`                           AS 
         `competence.updatedAt`, 
         `competence.module_has_competence`.`id`            AS 
         `competence.module_has_competence.id`, 
         `competence.module_has_competence`.`module_id`     AS 
         `competence.module_has_competence.module_id`, 
         `competence.module_has_competence`.`competence_id` AS 
         `competence.module_has_competence.competence_id`, 
         `competence.module_has_competence`.`score`         AS 
         `competence.module_has_competence.score`, 
         `competence.module_has_competence`.`createdat`     AS 
         `competence.module_has_competence.createdAt`, 
         `competence.module_has_competence`.`updatedat`     AS 
         `competence.module_has_competence.updatedAt` 
  FROM   `module` AS `module` 
         LEFT OUTER JOIN (`module_has_competence` AS 
                         `competence.module_has_competence` 
                          INNER JOIN `competence` AS `competence` 
                                  ON `competence`.`id` = 
  `competence.module_has_competence`.`module_id`) 
  ON `module`.`id` = 
  `competence.module_has_competence`.`competence_id` 
  WHERE  `module`.`id` = 1;

据我了解，.hasMany 引用的是 1:M 关系，它不需要连接表.

To my understanding .hasMany references a 1:M relationship, which does not require a join table.

http://docs.sequelizejs.com/en/latest/docs/associations/#one-to-many-associations

这是我得出这个结论的要点:

Here's the gist of how I got to this conclusion:

https://gist.github.com/sjlu/fa5c2e0e267cd692418a

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