什么控制着 Rails 控制器方法到渲染视图的映射？

Question

我的 rails 应用程序没有按预期路由。控制器中的搜索方法是显示。我已将代码缩减为最少的组件，并按照建议将它们发布在这里。

Rails.application.routes.draw do
  resources :backups
  get 'backups/search' => 'backups#search'
  resources :components
  resources :backup_media
end

class Component < ActiveRecord::Base
  has_many :backups
  has_many :backup_media, :through => :backups
end

class BackupMedium < ActiveRecord::Base
  has_many :backups
  has_many :components, :through => :backups
end

class Backup < ActiveRecord::Base
  belongs_to :component
  belongs_to :backup_medium

  # value to match either the name of the component or backup_medium
  def self.search(value)
    tables = "backups, components, backup_media"
    joins = "backups.backup_medium_id = backup_media.id and components.id = backups.component_id"
    c = find_by_sql "select * from #{tables} where components.name like '%#{value}%' and #{joins}"
    b = find_by_sql "select * from #{tables} where backup_media.name like '%#{value}%' and #{joins}"
    c.count > 0 ? c : b
  end  
end

class BackupsController < ApplicationController
  def search
    @backups = Backup.search(params[:search])
    render 'index'
  end
  def index
    @backups = Backup.all
  end
  def show
    # this would normally be the code to show an individual backup
    # but I'm re-using the code from index because the routing is broken
    @backups = Backup.all
  end
end

视图/备份/_search.html.erb

<%= form_tag backups_search_path, :method => 'get' do %>
  <%= label_tag(:search, "Search for:") %>
  <%= text_field_tag :search, params[:search], {:placeholder => 'Component or Media'  }%>
  <%= submit_tag "Search", :name => nil %>
<% end %>

视图/备份/index.html.erb

<h1>Listing Backups</h1>

<p id="notice"><%= notice %></p>

<%= render :partial => 'search' %>

<table>
    <tr>
      <th>id</th>
      <th>component_id</th>
      <th>backup_medium_id</th>
    </tr>

    <% @backups.each do |backup| %>
      <tr>
        <td><%= backup.id %></td>
        <td><%= backup.component.name %></td>
        <td><%= backup.backup_medium.name %></td>
      </tr>
    <% end %>
</table>

views/backups/show.html.erb 是从 index.html.erb 复制而来，因为它错误地接收了搜索结果

<h1>Show Backup</h1>

<p id="notice"><%= notice %></p>

<%= render :partial => 'search' %>

<table>
    <tr>
      <th>id</th>
      <th>component_id</th>
      <th>backup_medium_id</th>
    </tr>

    <% @backups.each do |backup| %>
      <tr>
        <td><%= backup.id %></td>
        <td><%= backup.component.name %></td>
        <td><%= backup.backup_medium.name %></td>
      </tr>
    <% end %>
</table>

欢迎提出改进搜索方法的建议。

如上所述，执行搜索后，渲染的是show.html.erb，而不是search.html.erb

有关工作演示（由于此处的建议提供了更好的代码），请参阅 https://github.com/pamh09/rails-search-demo

Answer 1

您的路由中没有backups_search_path，因此它将查询字符串中的search 视为id 并因此呈现show.html.erb，因此请尝试

get 'backups/search' => 'backups#search', as: :backups_search

Answer 2

在调试过程中，我发现当 Rails 对来自模型的返回对象不满意时，它会始终路由到错误的视图。