简单表单多选复选框

Question

我一直在尝试构建一个搜索表单，允许用户通过选择多个复选框来选择下拉列表中的内容。当我提交表单，值越来越阵列中的在年底通过一个空值，当我检查日志查询看起来像这样

UPDATE `searches` SET `ethnicity` = '---\n- Pacific Islander\n- White\n- Other\n- \'\'\n', `updated_at` = '2014-04-21 18:24:03' WHERE `searches`.`id` = 1 

我不明白为什么我有额外的问题每个表单值周围的字符。我使用的简单的形式和我的形式看起来像这样

<%= simple_form_for(:search, :url => {:controller => 'searches', :action => 'update', :slug => session[:username]}) do |f| %> 
       <%= f.error_notification %> 
<%= f.input :ethnicity, :label => "Ethnicity", :collection => ["Asian","Black", "Hispanic/Latino", "Indian", "Middle Eastern", "Native American", "Pacific Islander", "White", "Other"], :include_blank => "Anything", wrapper_html: { class: 'form-group' }, :as => :check_boxes, :input_html => {:name => "search[ethnicity][]", :multiple => true}, include_hidden: false %> 

<% end %> 

我的搜索控制器允许阵列从我的理解，因为即时通讯使用Rails 4，进出口使用强大的参数

def search_params 
    params.require(:search).permit(:id, :user_id, :ethnicity => []) if params[:search] 
end 

我只是张贴节的代码不工作，因为我的表单有其他领域，如性别，身高，年龄等，但这些都工作正常。当我使用复选框时，我只有问题。单选按钮和选择字段的工作完美。

这里是一个完整的搜索日志提交

Parameters: {"utf8"=>"✓",  "authenticity_token"=>"WMR/U8ztPOb+Y8vGoAcP2Le5k8T5ZC02r0uoVdJMuSg=", "search"=>{"gender"=>"Female", "interested_in"=>"Men", "min_age"=>"22", 
"max_age"=>"44", "ethnicity"=>["Pacific Islander", "White", "Other", ""], 
"education"=>"", "income"=>"", "religion"=>"", "body_type"=>"", "min_height"=>"", "max_height"=>"", "smoke"=>"", "drink"=>"", "drugs"=>"", "exercise"=>"", "have_children"=>"", 
"want_children"=>"", "pets"=>""}, "commit"=>"Search", "slug"=>"wahidp"} 
Geokit is using the domain: localhost 
User Load (0.5ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT 1 

Search Load (0.3ms) SELECT `searches`.* FROM `searches` WHERE `searches`.`user_id` = 1 LIMIT 1 
    (0.1ms) BEGIN 
    SQL (0.4ms) UPDATE `searches` SET `ethnicity` = '---\n- Pacific Islander\n- White\n- 
    Other\n- \'\'\n', `updated_at` = '2014-04-21 18:24:03' WHERE `searches`.`id` = 1 

林完全是可能的东西建设的出路我联赛的初学者，但我已经深入研究这一问题，并需要更多帮助的时候。任何人都可以解释为什么这不工作，我需要做什么？谢谢！

我试图消除：include_blank => “任何”，但我接收到相同的日志输出

Processing by SearchesController#update as HTML 
Parameters: {"utf8"=>"✓", "authenticity_token"=>"WMR/U8ztPOb+Y8vGoAcP2Le5k8T5ZC02r0uoVdJMuSg=", "search"=>{"gender"=>"Female", "interested_in"=>"Men", "min_age"=>"22", "max_age"=>"44", "ethnicity"=>["Other", ""], "education"=>"", "income"=>"", "religion"=>"", "body_type"=>"", "min_height"=>"", "max_height"=>"", "smoke"=>"", "drink"=>"", "drugs"=>"", "exercise"=>"", "have_children"=>"", "want_children"=>"", "pets"=>""}, "commit"=>"Search", "slug"=>"wahidp"} 
Geokit is using the domain: localhost 
User Load (0.6ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT 1 
Search Load (0.4ms) SELECT `searches`.* FROM `searches` WHERE `searches`.`user_id` = 1 LIMIT 1 
    (0.1ms) BEGIN 
SQL (0.3ms) UPDATE `searches` SET `ethnicity` = '---\n- Other\n- \'\'\n', `updated_at` = '2014-04-21 21:24:55' WHERE `searches`.`id` = 1 

Answer 1

经过几天的研究，我终于找出答案。首先，我必须添加

serialize :ethnicity, Array 

到搜索模型的顶部。然后在同一个模型，而下面的瑞恩·贝茨高级搜索视频，我纠正了我的查询看起来像这样

users = users.where("ethnicity in (?)", ethnicity) if ethnicity.present? 

感谢基尔提Thorat您的帮助！

Answer 2

更新checkboxes代码的建议如下：

<%= f.input :ethnicity, :label => "Ethnicity", :collection => ["Asian","Black", "Hispanic/Latino", "Indian", "Middle Eastern", "Native American", "Pacific Islander", "White", "Other"], :include_blank => "Anything", wrapper_html: { class: 'form-group' }, :as => :check_boxes, include_hidden: false, :input_html => {:name => "search[ethnicity][]", :multiple => true} %> 

UPDATE

添加以下内容到SearchesController#update行动之前updating的记录。

## This will remove the extra "" value from params[:search][:ethnicity] 
params[:search][:ethnicity] = params[:search][:ethnicity].reject(&:empty?) 

我做了差不多2小时的研究只是为了找出原因如预期，并发现有轨道4发布之前提出的一些问题include_hidden: false是行不通的。但即使在Rails 4发布后，这个问题仍然存在。这就是为什么上述替代方案暂时可行。