Ruby on Rails的 - 如何使关系工作在路由，控制器，查看？的has_many，belongs_to的 [英] ruby on rails - how to make relationship works in route, controller, view ? has_many, belongs_to

问题描述

我努力让我在轨工作的关系。

I am struggling to get my relationship in rails to work.

我有一个用户，画廊，Comment模型

I have a User,Gallery,Comment model

class Gallery  
  has_many :comments
  belongs_to :user
end

class User  
  has_many :comments
  has_many :galleries
end

class Comment
  belongs_to :gallery
  belongs_to :user
end

现在我应该怎么在路由，控制器和意见做链接这一切吗？
请帮帮我 ？其相当混乱找出答案。如果可以，我不希望它被嵌套像railscast，但我想每个模型，如画廊，我可以输入用户，如评论我能找到和输入galleryid和用户ID。

now what should i do in the routes, controller and views to link this all up ? please help me ? its quite confusing finding out the answers. If can, I dont want it to be nested like in the railscast, but i want for each model, eg gallery i can input user, eg comment i can find and input the galleryid and userid.

林完全失去了在遗忘了，不知道该怎么办。请给一些援助。谢谢。

Im totally lost in oblivion now, not knowing what to do. Please give some assistance. thanks.

推荐答案

这是一个复杂的问题，你不能简单地告诉怎么做，但我会尽力帮助一点点。 Zippie的建议是一个很好的，你应该通过一个教程，了解不同类型的关系。

It's a complex subject that you can't be simply told how to do, but I'll try to help a little. Zippie's suggestion is a good one, you should go through a tutorial to learn about the different kinds of relationships.

在你的数据库，你将需要：

In your database, you will need:

create_table :gallery do |t|
  t.user_id
end

create_table :comments do |t|
  t.gallery_id
  t.user_id
end

这是Rails会用它来搭配你的模型（外指数在去指定belongs_to的关系模型）。

These are the foreign indices that Rails will use to match your models (the foreign index goes in the model that specifies the belongs_to relationship).

至于你的路线，没有单一的解决方案，但你可能要嵌套他们，所以你可以做这样的事情/用户/评论或/画廊/评论：

As for your routes, there is no single solution, but you might want to nest them so you can do things like /users/comments or /galleries/comments:

resource :users do
   resource :comments
end

resource :galleries do
   resource :comments
end

您也可以简单地让它们分开：

You could also simply have them separately:

resources :users, :galleries, :comments

在你的控制器，创建一个新的对象时，你应该从对象做到这一点，是属于：

In your controller, when creating a new object, you should do so from the object it belongs to:

@comment = current_user.comments.build(params[:comment])

此将注释的USER_ID设置为当前用户，例如

This will set the comment's user_id to the current user, for example.

在视图中，没有太多的区别，只是让@comments变量，像这样的控制器：

In the view, there's not much difference, just get the @comments variable in the controller like so:

@comments = @gallery.comments

，并用它在你的看法。

and use it in your view.

当你要定义一个表单辅助函数来创建一个新的评论，这可能不太直观，例如：

It might be less intuitive when you want to define a form helper to create a new comment, for example:

<%= form_for([@gallery, @comment]) do |f| %>
  ...
<% end %>

我希望可以帮助您开始。

I hope that helps you get started.

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