2009-08-28 51 views
1

我是Rails的新手。我只是脚手架一个小模型。该模型有一个称为类别的字段。现在我想按类别过滤索引页上的条目。在Rails中过滤窗体?

<% form_for @domain do |f| %> 
<p> 
Domain: 
<%= f.select(:Domain,%w{ LifeStyle Automobiles FoodAndBeverage Health IT Telecom EntertainmentAndCelebrity Education BankingInvestmentAndInsurance Travel Sports Parenting ConsumerElectronics RealtyAndLogistics CauseLed})%> 


<%= submit_tag "Filter" %> 
</p> 
<% end %> 

<table border="1"> 
    <tr> 
    <th>Domain</th> 
    <th>Category</th> 
    <th>Course detail</th> 
    <th>Nameofblog</th> 
    <th>Descriptionofblog</th> 
    <th>Smename</th> 
    <th>Smecommuntiy</th> 
    <th>Smeifnotorkfac</th> 
    <th>Noofmemb</th> 
    <th>Discussionforumname</th> 
    <th>Discussionforumdescription</th> 
    <th>Qnasitesname</th> 
    <th>Qnasitesnamedesc</th> 
    <th>Newssitename</th> 
    <th>Newssitedesc</th> 
    </tr> 

<% @media_universe_entries.each do |media_universe_entry| %> 
    <tr> 
    <td><%=h media_universe_entry.Domain %></td> 
    <td><%=h media_universe_entry.Category %></td> 
    <td><%=h media_universe_entry.CourseDetail %></td> 
    <td><%=h media_universe_entry.NameOfBlog %></td> 
    <td><%=h media_universe_entry.Descriptionofblog %></td> 
    <td><%=h media_universe_entry.SMEname %></td> 
    <td><%=h media_universe_entry.SMECommuntiy %></td> 
    <td><%=h media_universe_entry.SMEIfnotOrkFac %></td> 
    <td><%=h media_universe_entry.NoOfMemb %></td> 
    <td><%=h media_universe_entry.discussionforumname %></td> 
    <td><%=h media_universe_entry.discussionforumdescription %></td> 
    <td><%=h media_universe_entry.QNASitesname %></td> 
    <td><%=h media_universe_entry.QNASitesnameDesc %></td> 
    <td><%=h media_universe_entry.NewsSiteName %></td> 
    <td><%=h media_universe_entry.NewsSiteDesc %></td> 
    <td><%= link_to 'Show', media_universe_entry %></td> 
    <td><%= link_to 'Edit', edit_media_universe_entry_path(media_universe_entry) %></td> 
    <td><%= link_to 'Destroy', media_universe_entry, :confirm => 'Are you sure?', :method => :delete %></td> 
    </tr> 
<% end %> 
</table> 

<br /> 

<%= link_to 'New media_universe_entry', new_media_universe_entry_path %> 

正如你所看到的,我正在尝试创建一个明智的文件字符串。我该怎么做呢?

回答

5

您还应该发布控制器方法,以更好地理解模型。无论如何,假设模型Something有一个字符串“category”列,你不应该硬编码select的值,除非这些值是固定的,在这种情况下,你可能会考虑不使用字符串列。

这里有一个快速输入例如:

# something_controller.rb 
    def index 
    @categories = Something.find_by_sql("SELECT category FROM somethings GROUP BY category").map &:category 
    @somethings = params[:category].blank? ? Something.all : Something.find_all_by_category(params[:category]) 
    end 

本所认为:

<% form_tag(:action => :index) do %> 
    <%= select_tag "category", options_for_select(@categories) %> 
    <%= submit_tag "Filter" %> 
<% end %> 

<table> 
    <tr> 
    <th>foo</th> 
    ... 
    </tr> 
    <% somethings.each do |something| %> 
    <tr> 
     <td><%= something.foo %></td> 
     ... 
    </tr> 
    <% end %> 
</table> 

更新:

虽然上面的代码工作,这真的是太fastcoded,并建议不好的做法。

这里有一个更好的办法:

# app/models/Something.rb 
def self.all_categories 
    find_by_sql("SELECT category FROM somethings GROUP BY category").map(&:category).select {|x| x} 
end 

def self.select(category) 
    if category 
    find_all_by_category(category) 
    else 
    find :all 
    end 
end 

#app/controllers/something_controller.rb 
def index 
    @categories = Something.all_categories 
    @somethings = Something.select(params[:category]) 
end