在 Rails 3 问题中分页 [英] Paginate in Rails 3 issues

问题描述

我目前正在开发一个用 Rails 2 编写的 Reddit 克隆应用程序，我正在尝试使用 Rails 3 中的新功能加快速度.该应用程序非常简单，它有一个 Links 脚手架有 :url、:description、:points 和 :created_at.该应用程序路由到 links#submissions，您可以在其中查看所有提交的链接并提交新链接.

I'm currently working on a Reddit clone app that I had written in Rails 2 and I'm trying to bring it up to speed with new features in Rails 3. The app is very simple, it has a Links scaffold which has :url, :description, :points, and :created_at. The app routes to links#submissions where you can view all submitted links and submit a new link as well.

在提交页面上显示链接时，我遇到了 Rails 2 中的 paginate 方法问题.我目前正在运行 Rails 3.2.3，我知道我需要在 Rails 3 中使用 gem will_paginate(我已经包含在我的 Gemfile 中)但是每当我尝试拉起 localhost:3000 我收到这个错误信息:

I've run into a problem with the paginate method in Rails 2 when displaying the links on the submissions page. I am currently running Rails 3.2.3 and I understand that I need to use the gem will_paginate in Rails 3 (which I have included in my Gemfile) but whenever I try to pull up localhost:3000 I get this error message:

NoMethodError in LinksController#submissions...
undefined method paginate for #<LinksController:0x00000102ff5f98>

特别是在 Links 控制器的第 90 行.

specifically on line 90 of the Links controller.

这是我在 LinksController.rb 中的内容(第 90-93 行).

Here is what I have in my LinksController.rb (lines 90-93).

@link_pages, @Links = paginate :links, :order => order, :per_page => 20
@header_text = case ordering
    when 'hot' then 'Top rated submissions'
when 'new' then 'Latest submissions'

这不是在 Rails 3 中使用 paginate 的正确方法吗?

Is this not the correct way to use paginate in Rails 3?

推荐答案

对于 will_paginate，你应该在你的控制器中使用这样的东西:

For will_paginate, you should use something like this in your controller:

@links = Link.paginate(:page => params[:page], :per_page => 20)

在您看来，给定页面的链接将存储在 @links 实例变量中.您可以遍历该集合并显示链接.

In your view, the links for the given page will be stored in the @links instance variable. You can iterate over that collection and display the links.

要显示到其他页面的链接(链接)，您可以在视图中的某处使用它:

To show the links to other pages (of links), you use this somewhere in the view:

will_paginate @links

您可以在此处找到有关 will_paginate 的更多帮助:https://github.com/mislav/will_paginate

You can find more help for will_paginate here: https://github.com/mislav/will_paginate

然而，对于 Rails 3，我更喜欢 kaminari 而不是 will_paginate.它使用 Rails 3 范围.

However, for Rails 3, I prefer kaminari instead of will_paginate. It uses Rails 3 scopes.

在控制器中看起来是这样的:

It looks like this in the controller:

@links = Link.page(params[:page]).per(20)

在视图中:

paginate @links

您可以在此处阅读有关 kaminari 的更多信息:https://github.com/amatsuda/kaminari

You can read more about kaminari here: https://github.com/amatsuda/kaminari

您也可以在 kaminari 上观看 Ryan 的 Railscast:http://railscasts.com/episodes/254-pagination-with-kaminari

Also you can watch Ryan's Railscast on kaminari here: http://railscasts.com/episodes/254-pagination-with-kaminari

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