Rails多個選擇框問題搜索

Question

首先這裏是我的模型，控制器，視圖：

我的模型，這是我的搜索代碼：------------- --------------

def self.find_by_lcc(params) 
where = [] 
where << "category = 'Land'" 
unless params[:mls].blank? 
where << "mls = :mls" 
end 
unless params[:county].blank? 
where << "county = :county" 
end 
unless params[:acreage_range].blank? 
where << "acreage_range = :acreage_range" 
end 
unless params[:landtype].blank? 
where << "landtype = :landtype" 
end 
unless params[:price_range].blank? 
where << "price_range = :price_range" 
end 

if where.empty? 
[] 
else 
find(:all, 
:conditions => [where.join(" AND "), params], 
:order => "county, price desc") 
end 
end 

我的控制器：----------------

def land 
@counties = ['Adams', 'Alcorn', 'Amite', 'Attala']   
@title = "Browse" 
return if params[:commit].nil? 
@properties = Property.find_by_lcc(params) 
else 
'No properties were found' 

渲染：行動> 'land_table' 端

我的觀點：----------------------

<table width="900"> 
<tr> 
<td> 
<% form_tag({ :action => "land" }, :method => "get") do %> 
<fieldset> 
<legend>Search our Land Properties</legend> 
<div class="form_row"><p>&nbsp;</p></div> 
<div class="form_row"> 
<label for="mls">MLS Number:</label>&nbsp; 
<%= text_field_tag 'mls', params[:mls] %> 
</div> 
<div class="form_row"> 
<label for "county"><font color="#ff0000">*County:</font></label>&nbsp; 
<%= select_tag "county", options_for_select(@counties), :multiple => true, :size => 6 %> 
</div> 

<div class="form_row"> 
<label for "acreage_range">Acreage:</label>&nbsp; 
<%= select_tag "acreage_range", options_for_select([['All',''],['1-10','1-10'],['11-25','11-25'],['26-50','26-50'],['51-100','51-100']]) %> 
</div> 

<div class="form_row"> 
<label for "landtype">Type:</label>&nbsp; 
<%= select_tag "landtype", options_for_select([['All',''],['Waterfront','Waterfront'],['Wooded','Wooded'],['Pasture','Pasture'],['Woods/Pasture','Woods/Pasture'],['Lot','Lot']]) %> 
</div> 

<div class="form_row"> 
<label for="price_range"><font color="#ff0000">*Price:</font></label>&nbsp; 
<%= select_tag "price_range", options_for_select([['All',''],['0-1,000','0-1,000'],['1,001-10,000','1,001-10,000'],['10,001-50,000','10,001-50,000'],['50,001-100,000','50,001-100,000'],['100,001-150,000']])%> 
</div> 
<input type="text" style="display: none;" disabled="disabled" size="1" /> 
<%= submit_tag "Search", :class => "submit" %> 
</fieldset> 

<% end%> 
</td> 

</tr> 
</table> 

，直到我添加」，搜索工作正常：多=>真實，：大小=> 6「，使縣域多選。然後，我得到的錯誤：

Processing PublicController#land (for 65.0.81.83 at 2010-04-01 13:11:30) [GET] 
    Parameters: {"acreage_range"=>"", "commit"=>"Search", "county"=>["Adams", "Amite"],  "landtype"=>"", "price_range"=>"", "mls"=>""} 

ActiveRecord::StatementInvalid (Mysql::Error: Operand should contain 1 column(s):   SELECT * FROM `properties` WHERE (category = 'Land' AND county =  'Adams','Amite') ORDER BY county, price desc): 
    app/models/property.rb:93:in `find_by_lcc' 
    app/controllers/public_controller.rb:84:in `land' 
    /usr/lib/ruby/1.8/thread.rb:135:in `synchronize' 
    fcgi (0.8.7) lib/fcgi.rb:117:in `session' 
    fcgi (0.8.7) lib/fcgi.rb:104:in `each_request' 
    fcgi (0.8.7) lib/fcgi.rb:36:in `each' 
    dispatch.fcgi:24 

我已努力使縣，acreage_range和PRICE_RANGE領域到多個選擇框多種方式，但不能讓任何方法能夠正常工作。任何幫助將不勝感激。

感謝，

Answer 1

嘗試

unless params[:county].blank? 
    where << "county IN (:county)" 
end 

編輯＃1

我現在相信即使 「ALL」 選項選中它會工作

unless params[:county].blank? || params[:county] == "ALL" 
    where << "county IN (:county)" 
end 

編輯＃2

我認爲all選項是county。試試這個：

unless params[:county].blank? 
    where << "county IN (:county)" 
end 

unless params[:acreage_range].blank? || params[:acreage_range] == "ALL" 
    where << "acreage_range = :acreage_range" 
end 

希望現在的工作：]

Answer 2

Try  

unless params[:county].blank? 
    where << "county IN (:county)" 
end 

     OR 

unless params[:county].blank? 
    where << "county IN ( #{params[:county].join(',')})" 
end