在Ruby on Rails中使用like query进行搜索

Question

我是ROR开发的初学者.我有导航,我想在每个页面上搜索框,当我输入一些关键字时,它应该像在表格的字段中查询一样.我尝试使用一些在线教程,但无法做到.我的表名:这里的教程是导航栏上的搜索表单

<li><%= link_to 'Login', :controller => 'access', :action => 'login'  %></li>
<li><%= link_to 'Sign Up', :controller => 'users', :action => 'new'  %></li>
<li><%= link_to 'Logout', :controller => 'access', :action => 'logout'  %></li>
<div align="right">
<%= form_tag("/search", method: "get") do %>
  <%= label_tag(:q, "Search for:") %>
  <%= text_field_tag(:q) %>
  <%= submit_tag("Search") %>
<% end %>
</div>

这是我的控制器

class SearchController < ApplicationController 

  def show
    @tutorial = Tutorial.find(params[:q])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @tutorial }
    end
  end
end

这是我的模特

class Search < ActiveRecord::Base
  def @tutorial.search(search)
    if search
      find(:all, :conditions => ['tutorial_name LIKE ?', "%#{search}%"])
    else
      find(:all)
    end
  end
end

我不知道该怎么做.请帮忙

Answer 1

通常情况下,坏名称表示错误思考.我相信您Search的模型名称属于此类别.应该叫它Tutorial,不是吗？搜索是您对模型所做的事情,而不是模型本身.

如果这个猜测是正确的并且现在调用模型Tutorial并且它有一个名为name字符串的字段,那么你的模型就是

class Tutorial < ActiveRecord::Base

  def self.search(pattern)
    if pattern.blank?  # blank? covers both nil and empty string
      all
    else
      where('name LIKE ?', "%#{pattern}%")
    end
  end

end

这使得模型"智能"如何搜索教程名称:Tutorial.search('foo')现在将返回foo其名称中包含的所有教程记录.

所以我们可以创建一个使用这个新功能的控制器:

class SearchController < ApplicationController 

  def show
    @tutorials = Tutorial.search(params[:q])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @tutorial }
    end
  end
end

相应的视图必须显示教程.你的没有.最简单的方法是编写一个只提供一个教程的部分.说它叫_tutorial.html.erb.

然后在视图中Search,您需要添加

<%= render :partial => @tutorials %>

实际显示搜索结果.

加成

我将建立一个小例子.

# Make a new rails app called learning_system
rails new learning_system             

# Make a new scaffold for a Tutorial model.
rails g scaffold Tutorial name:string description:text 

# Now edit app/models/tutorial.rb to add the def above.

# Build tables for the model.
rake db:migrate

rails s # start the web server

# Now hit http://0.0.0.0:3000/tutorials with a browser to create some records.

<cntrl-C> to kill the web server

mkdir app/views/shared
gedit app/views/shared/_search_box.html.erb
# Edit this file to contain just the <%= form_tag you have above.

# Now add a header at the top of any view you like, e.g. 
# at the top of app/views/tutorials/index.html.erb as below
# (or you could use the layout to put it on all pages):

<h1>Listing tutorials</h1>
<%= render :partial => 'shared/search_box' %>

# Make a controller and view template for searches
rails g controller search show  

# Edit config/routes.rb to the route you want:  get "search" => 'search#show'

# Verify routes:

rake routes
       search GET    /search/:id(.:format)         search#show
    tutorials GET    /tutorials(.:format)          tutorials#index
              POST   /tutorials(.:format)          tutorials#create
 new_tutorial GET    /tutorials/new(.:format)      tutorials#new
edit_tutorial GET    /tutorials/:id/edit(.:format) tutorials#edit
     tutorial GET    /tutorials/:id(.:format)      tutorials#show
              PUT    /tutorials/:id(.:format)      tutorials#update
              DELETE /tutorials/:id(.:format)      tutorials#destroy

# Edit app/controllers/search_controller.rb as above.

# Create app/views/tutorial/_tutorial.html.erb with following content:
<tr>
<td><%= tutorial.name %></td>
<td><%= tutorial.description %></td>
</tr>

# Edit app/views/search/show.html.erb to have following content:
<h1>Show Search Results</h1>
<table>
<%= render :partial => @tutorials %>
</table>

现在尝试一下测试.填写搜索条件并按"搜索"按钮.