Has_many ：通过关联

发布于 2024-12-21 00:36:18 字数 568 浏览 2 评论 0原文

我使用 has_many :through 与三个模型建立了关系：

class Curriculum class < ActiveRecord::Base

    has_many :interests
    has_many :vacancies,: through => :interests
end

class Vacancy class < ActiveRecord::Base

   has_many :interests
   has_many :resumes,: through => :interests
end

class Interest < ActiveRecord:: Base

    belongs_to :vacancy
    belongs_to :curriculum
end

为了创建课程和职位空缺，我通过管理创建它们，我需要知道如何创建对空缺 ID 的兴趣，以及如何将其登录到系统上，我必须获取它的 ID 并在创建新的银行利息时建立关系。我想知道如何对其进行编程来做到这一点，我想知道控制器将如何获得创建操作，以及有什么更好的方法来做到这一点。

原文

I made a relationship with the three models using has_many :through:

class Curriculum class < ActiveRecord::Base

    has_many :interests
    has_many :vacancies,: through => :interests
end

class Vacancy class < ActiveRecord::Base

   has_many :interests
   has_many :resumes,: through => :interests
end

class Interest < ActiveRecord:: Base

    belongs_to :vacancy
    belongs_to :curriculum
end

And to create curriculum and vacancy, I create them by administrative, i need to know how can i create the interest to the id of the vacancy, and how it will be logged on the system I have to get the id of it and make the relationship in creating a new bank interest. I wonder how I can program it to do so, and I wonder how the controller will get the create action, and what better way to do this.

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话少心凉 2024-12-28 00:36:18

首先，尝试阅读整个“Rails 关联指南”，特别是关于has_many :through的部分。然后检查您的架构，如果您的数据库已迁移，并且表 interests 包含 curriculums 和 vacancies 的必要外键，称为 curriculum_id< /code> 和 vacancy_id。

如果一切就绪，以下代码将创建两个对象之间的关系：

@curr = Curriculum.find(1)
@vac = Vacancy.find(1)
@curr.interests << @vac
@curr.save

最后两行在 @curr 和 @vac 之间创建兴趣并将其存储在数据库。因此，您不应该使用 ID 并直接处理它们，而应该使用对象。

现在的第二部分是提供一个 UI，以允许定义（和删除）课程和职位空缺之间的兴趣。这里的基本流程是：

您重点关注一门课程。
您有一个添加/删除课程的链接。
打开的视图显示可能的空缺职位列表，其中每个空缺职位都有一个复选框。
通过选择（或取消选择）复选框，职位空缺的 ID 将保存在发送到控制器的请求的参数中。

请参阅（较旧的）播客 Railscast #52 如何在类似的上下文中执行此操作。或者查看 has_many :through 和复选框的示例。

另一种方法是使用 JQuery 自动完成，并逐一添加兴趣。请参阅不错的播客 Railscast #258，它使用 JQuery Tokeninput 来实现这一点。

First, try to read the whole "Guide to Rails on Associations", especially the part about has_many :through. Then check your schema if your db is migrated and contains for the table interests the necessary foreign keys to curriculums and vacancies called curriculum_id and vacancy_id.

If that is all in place, the following code will create the relationship between two objects:

@curr = Curriculum.find(1)
@vac = Vacancy.find(1)
@curr.interests << @vac
@curr.save

The last two lines creates an interest between @curr and @vac and store that on the database. So you should not use IDs and handle them directly, but work with objects instead.

The second part now is to provide a UI to allow the definition (and removal) of interests between curricula and vacancies. The base flow here is:

You have one curriculum in focus.
You have a link to add / remove curricula.
The view that opens shows a list of possible vacancies, where every vacancy has a checkbox.
By selecting (or deselecting) the check boxes, the IDs of the vacancies will be held in the params of the request sent to the controller.

See the (older) podcast Railscast #52 how to do that in a similar context. Or see the example for has_many :through with checkboxes.

An alternative way would be to use JQuery autocomplete, and add so interests one-by-one. See the nice podcast Railscast #258 which uses JQuery Tokeninput for that.

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