Kev*_*gts 6 mysql node.js sequelize.js
我的MSQL表中有这两个模型之间的多对多关系:
- 场地-代表可以有多个所有者(雇员)的场地
- 员工-代表可以是首席执行官,销售员工或任何其他形式的员工。
我正在使用sequelize建立这样的关系:
Employee.associate = function (models) {
models.Employee.belongsToMany(models.Venue, { through: 'EmployeeVenues' })
}
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Venue.associate = function (models) {
models.Venue.belongsToMany(models.Employee, { through: 'EmployeeVenues' })
}
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根据Sequelize文档,它将创建一个名为EmployeeVenues的新模型,该模型具有等效的外键employee_id和场所_id。需要通过定义。Sequelize以前会尝试自动生成名称,但这并不总是导致最合理的设置。这会将方法getVenues,setVenues,addVenue,addUsers添加到Employee中。
并且这是正确的,当我启动我的Sequelize时,它将创建一个名为EmpoyeeVenues的新表,并使用正确的外键作为复合键。但是,当我查询getVenues时,它不会返回预期的输出。相反,它也返回关联的表值,这是我不想要的。
router.get('/api/v1/users/:employee_id/venues', (request, response) => {
var employeeId = request.params.employee_id;
models.Employee.findOne({
where: {id: employeeId}
}).then((employee) => {
if(!employee) { return response.status(400).send("Employee doesnt have a venue registered yet.")}
var venues = employee.getVenues().then((venues) => {
response.status(200).send(venues);
})
})
});
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[
{
"id": 1,
"capacity": "11",
"venue_name": "Club Fix",
"venue_description": "Club in Tilburg",
"EmployeeVenues": {
"employee_id": 1,
"venue_id": 1
}
},
{
"id": 2,
"capacity": "400",
"venue_name": "Club Vie",
"venue_description": "Club in Rotterdam",
"EmployeeVenues": {
"employee_id": 1,
"venue_id": 2
}
}
]
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为什么Sequelize在此查询中包含EmployeeVenues?并且如何防止EmployeeVenues包含在响应中?
根据2014年制作的Sequelize github页面上的一个问题,有一个可行的解决方案
https://github.com/sequelize/sequelize/issues/2143
User.find({
where: {id: userId}, attributes: userFields,
include: [
{model: db.Role, attributes: roleFields, through: {attributes: []}}
]
});
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但是,它与最新版本的Sequelize文档中的文档版本不匹配,至少应该如此。
User.findAll({
include: [{
model: Project,
through: {
attributes: ['createdAt', 'startedAt', 'finishedAt'],
where: {completed: true}
}
}]
});
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甚至简单地在参考文档中说明:
user.getPictures() // gets you all pictures
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根据 2014 年创建的 Sequelize github 页面上的一个问题,有一个有效的解决方案
https://github.com/sequelize/sequelize/issues/2143
User.find({
where: {id: userId}, attributes: userFields,
include: [
{model: db.Role, attributes: roleFields, through: {attributes: []}}
]
});
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但它与最新的 Sequelize 文档中记录的版本不匹配,至少应该是这样。
User.findAll({
include: [{
model: Project,
through: {
attributes: ['createdAt', 'startedAt', 'finishedAt'],
where: {completed: true}
}
}]
});
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user.getPictures() // gets you all pictures
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我认为给出的答案遗漏了一件需要的重要事情 - 在哪里保存所包含模型所需的属性,在这里 - Project。github上的问题已经有了最终答案,但仍然不是我期待的完整答案。
\n\n我们需要在模型级别重新指定属性,然后将连接表属性设置为none
\n\nUser.findAll({\n include: [{\n model: Project,\n\n through: \'JoinTableAliasName\' /// only if exist/needed\n as: \'modelAssociationAlias\' // only if exist/needed\n\n // attributes needed from Project table\n attributes: [\'createdAt\', \'startedAt\', \'finishedAt\'],\n\n through: { // through again doesn\'t create any issue\n attributes: [], // this helps removing the join table in returned data\n where: {completed: true}\n }\n }]\n});\n
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