Question

我最近一直在努力教自己RoR。过去几周我一直在研究一些教程，试着在我去的时候为应用程序添加一些自己的功能。我试图实现的功能看起来很简单，但怀疑我的解决方案是否尽可能安全和优雅。

到目前为止，用户可以向网站提交帖子。该模型由图像，标题，类别和描述组成。用户还可以对给定的帖子发表评论（评论包含在另一个表中）。我想在导航栏上添加一个下拉菜单，允许用户浏览特定的类别。换句话说，索引应该只显示用户选择的类别中的帖子。虽然我的解决方案有效，但我对它不满意。这是导航栏的代码：

%button#menu1.btn.btn-primary.dropdown-toggle{"data-toggle" => "dropdown", :type => "button"}
    Explore
    %span.caret
  %ul.dropdown-menu{"aria-labelledby" => "menu1", :role => "menu"}
    %li{:role => "presentation"}
      %a
        = link_to "All", posts_path(categories: "All")
    %li{:role => "presentation"}
      %a
        = link_to "3D Modeling", posts_path(categories: "3D Modeling")
    %li{:role => "presentation"}
      %a
        = link_to "Design", posts_path(categories: "Design")
    %li{:role => "presentation"}
      %a
        = link_to "Drawing", posts_path(categories: "Drawing")
    %li{:role => "presentation"}
      %a
        = link_to "Photography", posts_path(categories: "Photography")
    %li{:role => "presentation"}
      %a
        = link_to "Printmaking", posts_path(categories: "Printmaking")
    %li{:role => "presentation"}
      %a
        = link_to "Sculpture", posts_path(categories: "Sculpture")
    %li{:role => "presentation"}
      %a
        = link_to "Other", posts_path(categories: "Other")

这是我在posts控制器中的索引方法的代码：

if params[:categories] && params[:categories] == "All"
  @posts = Post.all.order('created_at DESC').page params[:page]
elsif params[:categories] && params[:categories] == "3D Modeling"
  @posts = Post.where(category: "3D Modeling").page params[:page]
elsif params[:categories] && params[:categories] == "Design"
  @posts = Post.where(category: "Design").page params[:page]
elsif params[:categories] && params[:categories] == "Drawing"
  @posts = Post.where(category: "Drawing").page params[:page]
elsif params[:categories] && params[:categories] == "Photography"
  @posts = Post.where(category: "Photography").page params[:page]
elsif params[:categories] && params[:categories] == "Printmaking"
  @posts = Post.where(category: "Printmaking").page params[:page]
elsif params[:categories] && params[:categories] == "Sculpture"
  @posts = Post.where(category: "Sculpture").page params[:page]
elsif params[:categories] && params[:categories] == "Other"
  @posts = Post.where(category: "Other").page params[:page]
end

最后，这是我的路线文件中的代码：

resources :post do
    resources :comments do
end

root 'posts#index'

好像我应该以不同方式处理这些路线？或者不是这种情况，因为类别列是帖子模型的一部分而不是它自己的表格？非常感谢你的帮助！

Answer 1

试试这个

if params[:categories].present?
  @posts = Post.where(category: params[:categories]).page(params[:page])
else
  @posts = Post.all.order('created_at DESC').page(params[:page])
end

并删除link_to类别：＆＃34;全部＆＃34;

<%= link_to "All", posts_path %>

RoR：根据列值选择某些帖子

1 个答案: