ruby on rails 一步步开始(2)分页和简单查询

使用 will_paginate 进行分页和简单查询

在命令行下使用 gem install will_paginate 命令，出现下面结果安装成功

打开 books_controller.rb (你自己的控制器)

注释掉查找全部的方法，使用下面的方法，已经集成根据title进行查询

#@books=Book.all
@books=Book.paginate:page=>params[:page],
:per_page=>2,
:conditions=>["titlelike?","%#{params[:search]}%"]
respond_todo|format|
format.html#index.html.erb
format.xml{render:xml=>@books}
end
end

#@books = Book.all
@books = Book.paginate :page => params[:page],   
                               :per_page => 2, 
                               :conditions => ["title like ?", "%#{params[:search]}%"] 
    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @books }
    end
  end

打开对应的 books_controller.rb 视图页面 index.html.erb

添加查询功能

<%form_tagbooks_path,:method=>'get'do%>
<p>
<%=text_field_tag:search,params[:search]%>
<%=submit_tag"Search",:name=>nil%>
</p>
<%end%>

<% form_tag books_path, :method => 'get' do %> 
<p> 
    <%= text_field_tag :search, params[:search] %> 
    <%= submit_tag "Search", :name => nil %> 
</p> 
<% end %> 

及分页功能

<div>
<div>
<%=page_entries_info@books%>
</div>
<%=will_paginate@books,:container=>false%>
</div>

 <div>
      <div >
        <%= page_entries_info @books %>
      </div>
      <%= will_paginate @books, :container => false %>
    </div>

打开环境文件 environment.rb 在end后添加

require"will_paginate"

require "will_paginate"

运行效果如下

本文转自:http://95700900.javaeye.com/blog/573308