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我已经花了几天的时间来解决这个问题，只是无法弄清楚如何将范围或其他方法应用于此。我也尝试了一些搜索宝石，但因为我处于如此基本的水平，所以想让事情尽可能简单。下面的工作大致基于 rails casts #37 “simple search” 教程。它是唯一一个略微成功的。

我的问题; 我想对年份、品牌、型号、发动机（如果有）进行搜索，深入到所需的车辆。为了方便我，我每页进行一次搜索。目前我无法将以前的搜索参数带到当前搜索中。我确信有比下面的方法更好的方法，我愿意接受建议。我只是无法成功地改编我在网上找到的例子。

数据库：我有一个名为“carinfo”的 postgres 数据库表，该表包含“id、caryear、carmake、carmodel、carengine、submodel、website1、website2、website3”列。我已经用十几辆左右的车辆填充了一些测试数据。

控制器/listing_controller.rb

为了简化事情，我还没有使用模型，所以它全部在控制器中：

class ListingController < ApplicationController 
  include ListingHelper 

  def year 
    @searchyr = Carinfo.find(:all)
  end

  def make
    @searchmk = Carinfo.find(:all, :conditions => ['caryear LIKE ?', "%#{params[:year]}%"])
  end

  def model
    @searchmdl = Carinfo.find(:all, :conditions => ['caryear LIKE ? AND carmake LIKE ?', "%#{params[:year]}%", "%#{params[:make]}%"] )
      # '%2009%' static values work ok
  end

  def engine
    @searcheng = Carinfo.find(:all, :conditions => ['caryear LIKE ? AND carmake LIKE ? AND carmodel LIKE ?', "%#{params[:year]}%", "%#{params[:make]}%", "%#{params[:model]}%"])
  end

  def selectedcar
    @searchres = Carinfo.find(:all, :conditions => ['caryear LIKE ? AND carmake LIKE ? AND carmodel LIKE ? AND carengine LIKE ?', "%#{params[:year]}%", "%#{params[:make]}%", "%#{params[:model]}%","%#{params[:engine]}%"])
  end

end

意见/清单/year.html.erb

<% provide(:title, "Year") %> 
<h1>Year Search - Under: Listing</h1>

<%= form_tag(make_path, :method => "get") do %>
    <%= select_tag :year, options_for_select(@searchyr.collect{|y| [y.caryear, y.caryear]}.uniq), {:onchange => 'this.form.submit()'} %>
<% end %>

<!-- this can be deleted once everything is working  it just helps see what's filtered -->
<ul>
    <% for search in @searchyr %>
    <li>
        <%= search.caryear %>
        <%= search.carmake %>
        <%= search.carmodel %>
    </li>
    <% end %>
</ul>

<center><%= button_to "Reset Search", year_path, class: "btn btn-large btn-primary" %></center>

意见/清单/make.html.erb

<% provide(:title, "Make Search") %> 
<h1>Make Search - Under: Listing</h1>

<%= form_tag(model_path, :method => "get") do %>
    <%= select_tag :make, options_for_select(@searchmk.collect{|y| [y.carmake, y.carmake]}.uniq), {:onchange => 'this.form.submit()'} %>
<% end %>

<center><%= button_to "Reset Search", year_path, class: "btn btn-large btn-primary" %></center>

意见/清单/model.html.erb

<% provide(:title, "Model Search") %> 
<h1>Model Search - Under: Listing</h1>

<%= form_tag(engine_path, :method => "get") do %>
    <%= select_tag :model, options_for_select(@searchmdl.collect{|y| [y.carmodel, y.carmodel]}.uniq), {:onchange => 'this.form.submit()'} %>
<% end %>

<center><%= button_to "Reset Search", year_path, class: "btn btn-large btn-primary" %></center>

意见/清单/model.html.erb

<% provide(:title, "Engine Search") %> 
<h1>Engine Search - Under: Listing</h1>

<%= form_tag(selectedcar_path, :method => "get") do %>
    <%= select_tag :engine, options_for_select(@searcheng.collect{|y| [y.carengine, y.carengine]}.uniq), {:onchange => 'this.form.submit()'} %>
<% end %>

<center><%= button_to "Reset Search", year_path, class: "btn btn-large btn-primary" %></center>

意见/清单/selectedcar.html.erb

<% provide(:title, "Selected Car") %> 
<h1>Selected Car - Under: Listing</h1>


<center><%= button_to "Reset Search", year_path, class: "btn btn-large btn-primary" %></center>

<ul>
    <% for search in @searchres %>
    <li>
        <%= search.caryear %>
        <%= search.carmake %>
        <%= link_to search.carmodel, search_path(search) %>
    </li>
    <% end %>
</ul>

config/routes.rb 只是处理这个问题的部分：

  match '/year',          to: 'listing#year'
  match '/make',          to: 'listing#make'
  match '/model',          to: 'listing#model'
  match '/engine',          to: 'listing#engine'
  match '/selectedcar',          to: 'listing#selectedcar'

一如既往，非常感谢您的帮助。谢谢迈克

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1 回答 1

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首先，您的控制器不需要所有这些方法，请执行以下操作：

class ListingController < ApplicationController 
  include ListingHelper 


  def search
    @search = Carinfo.where('caryear LIKE ?', params[:year]) unless params[:year].blank?
    @search = @search.where('carmake LIKE ?', params[:make]) unless params[:make].blank?
    etc etc...
  end

end

然后只需要一个包含您想要搜索的所有输入的表单

于 2012-12-20T17:26:19.123 回答