如何在未选中时使check_box_tag发布“false”或“0”参数？ [英] How can I make a check_box_tag to post a 'false' or '0' parameter when unchecked?

问题描述

使用以下check_box_tag：

 <％= check_box_tag'object [boolean_attribute]'，1，object.boolean_attribute％ > 
  

我可以只在一个方向更新boolean_attribute：从false到true。

当默认情况下取消选中（因为object.boolean_attribute为false）并且我检查它然后提交表单时，会发布一个：boolean_attribute => 1参数。

但，当我尝试从true更新为false没有param传递，所以boolean_attribute仍然为真。

换句话说，当默认情况下检查（因为object.boolean_attribute为true）并且取消选中它然后提交表单时，a：boolean_attribute => 0是不发布的。

如何使此check_box_tag在未选中时发布：boolean_attribute => 0参数？

确定是否有一些选项可以轻松实现：
http://api.rubyonrails.org/classes/ActionView/Helpers/FormTagHelper.html#method-i-check_box_tag

谢谢。

EDIT

由于某种原因，我不能在我的实际代码多对多关联）hidden_​​field_tag不工作。

 <％= hidden_​​field_tag'order [preparing_attributes] []煮熟]，无％> 
<％= check_box_tag'order [prepare_attributes] [] [cooked]'，'1'，prepare.cooked？ ％> 
  

现在我有相反的问题：我可以取消选中复选框，准备更新为aspected，

以下是未选中框的已发布参数：

<$参数：{utf8=>✓，authenticity_token=>bGgPGbk + Cuk2q + LEgqetmk4e7xie8dB3iMP9Cj3SUm0 =，order=> {customer_name=> ;Duccio Armenise，duedate=>2012-04-25 09：24：00.000000，preparations_attributes=> [{quantity=>1，description=&自定义食谱，种类=>自定义，烹饪=>，recipe_id=>9，id=>86quantity_attributes=& {ingredient_id=>，qty=>，_destroy=>0}，{ingredient_id=>11，qty=> ，id=>193，_destroy=>0}]，_destroy=>0}]，add_preparation=> {recipe_id=& }}，continue=>确认，id=>31}

现在看看当我检查复选框，从cooked=>开始，由于某种原因Rails正在关闭prepare_attributes哈希太早了！

 参数：{utf8=>✓，authenticity_token=>bGgPGbk + Cuk2q + LEgqetmk4e7xie8dB3iMP9Cj3SUm0 =，order=> {customer_name=& Duccio Armenise，duedate=>2012-04-25 09：24：00.000000，preparations_attributes=> [{quantity=>1，description=>custom食谱，种类=>自定义，熟=>}，{cooked=>1，recipe_id=>9，id=> 86，quantities_attributes=> [{ingredient_id=>，qty=>，_destroy=>0}，{ingredient_id=>11 ，q=>5.0，id=>193，_destroy=>0}]，_destroy=>0}]，add_preparation > {recipe_id=>}}，继续=>确认，id=>31} 
  

编辑＃2 ：

我想我遇到了一个与深度相关的Rails错误嵌套资源表单和参数传递： https://github.com/rails/rails/issues/5937 p>

现在我使用了一个select_tag：

  ％= select_tag'order [preparing_attributes] [] [cooked]'，options_for_select（{yes：1，no：0}，prepare.cooked？ ？ 1：0）％> 
  

我认为切换到一个select_tag为了避免hidden_​​field gotcha是一个可以接受的解决方法。

无论如何，谢谢你的答案！

解决方案

check_box （w / o _tag ）助手添加了隐藏字段以解决您的问题：

 <％= check_box' '，'boolean_attribute'，{}，'true'，'false'％> 
 
＃result：
< input name =object [boolean_attribute]type =hiddenvalue =false/> 
< input id =object_boolean_attributename =object [boolean_attribute]type =checkboxvalue =true/> 
 

UPD：处理嵌套资源（产品 accept_nested_attributes_for ：line_items）

  = form_for @product，url：''do | f | 
％p 
 = f.label：title 
 = f.text_field：title 
 
 = f.fields_for：line_items do | li | 
 = li.check_box：approved 
 = li.label：approved，li.object.id 
％br 
 = f.submit 
  

选中3个复选框中的2个可以给我 params ：

{0=> {已批准=>0 ，id=>47}，1=> {已批准=>1，id=>48}，2=> ，id=>51}}}，commit=>Update Product，action=>action1，controller=>test}

params 作为YAML的可读性：

 产品：
 title：RoR book 
 line_items_attributes：
'0'：
 approved：'0'
 id：'47'
'1'：
 approved：'1'
 id：'48'
'2'：
 approved：'1'
 id：'51' 
  

有这个 params 允许我使用一行用于更新关联的line_item的代码：

  @ product.update_attributes params [：product] 
  
 
 
 
我希望它有帮助。
 
With the following check_box_tag:
<%= check_box_tag 'object[boolean_attribute]', 1, object.boolean_attribute %>
I can update the boolean_attribute in only one direction: from false to true.

When is unchecked by default (because object.boolean_attribute is false) and I check it and then submit the form, a :boolean_attribute => 1 parameter is posted.

But, when I try to update from true to false no param is passed, so the boolean_attribute remains true.

In other words, when is checked by default (because object.boolean_attribute is true) and I uncheck it and then submit the form, a :boolean_attribute => 0 is not posted.

How can I make this check_box_tag to post a :boolean_attribute => 0 parameter when unchecked?

From the api I can't figure out if there is some option to pass to easily achieve it:
http://api.rubyonrails.org/classes/ActionView/Helpers/FormTagHelper.html#method-i-check_box_tag

Thank you.

EDIT

For some reason I cannot fathom, in my actual code (with a nested many-to-many association) the hidden_field_tag is not working.
<%= hidden_field_tag 'order[preparations_attributes][][cooked]', nil %>
<%= check_box_tag 'order[preparations_attributes][][cooked]', '1', preparation.cooked? %>
Now I have the opposite problem: I can uncheck the checkbox and the preparation is updated as aspected, but if I check the checkbox it messes up the params.

Here are the posted params for the unchecked box:
Parameters: {"utf8"=>"✓", "authenticity_token"=>"bGgPGbk+Cuk2q+LEgqetmk4e7xie8dB3iMP9Cj3SUm0=", "order"=>{"customer_name"=>"Duccio Armenise", "duedate"=>"2012-04-25 09:24:00.000000", "preparations_attributes"=>[{"quantity"=>"1", "description"=>"custom recipe", "kind"=>"custom", "cooked"=>"", "recipe_id"=>"9", "id"=>"86", "quantities_attributes"=>[{"ingredient_id"=>"", "qty"=>"", "_destroy"=>"0"}, {"ingredient_id"=>"11", "qty"=>"5.0", "id"=>"193", "_destroy"=>"0"}], "_destroy"=>"0"}], "add_preparation"=>{"recipe_id"=>""}}, "continue"=>"Confirm", "id"=>"31"}
Now see what a mess when I check the checkbox, beginning from "cooked"=>" ", for some reason Rails is closing the preparation_attributes hash too early!
Parameters: {"utf8"=>"✓", "authenticity_token"=>"bGgPGbk+Cuk2q+LEgqetmk4e7xie8dB3iMP9Cj3SUm0=", "order"=>{"customer_name"=>"Duccio Armenise", "duedate"=>"2012-04-25 09:24:00.000000", "preparations_attributes"=>[{"quantity"=>"1", "description"=>"custom recipe", "kind"=>"custom", "cooked"=>""}, {"cooked"=>"1", "recipe_id"=>"9", "id"=>"86", "quantities_attributes"=>[{"ingredient_id"=>"", "qty"=>"", "_destroy"=>"0"}, {"ingredient_id"=>"11", "qty"=>"5.0", "id"=>"193", "_destroy"=>"0"}], "_destroy"=>"0"}], "add_preparation"=>{"recipe_id"=>""}}, "continue"=>"Confirm", "id"=>"31"}
EDIT #2:

I think I ran into a Rails bug related to deep nested resource forms and param passing: https://github.com/rails/rails/issues/5937

For now I made it to work with a select_tag:
<%= select_tag 'order[preparations_attributes][][cooked]', options_for_select({yes: 1, no: 0}, preparation.cooked? ? 1 : 0) %> 
I think that switching to a select_tag in order to avoid the "hidden_field gotcha" is an acceptable workaround. 

Anyway, thank you for the answers! 
解决方案
check_box (w/o _tag) helper adds hidden field to address your problem for you:
<%= check_box 'object', 'boolean_attribute', {}, 'true', 'false' %>

# result:
<input name="object[boolean_attribute]" type="hidden" value="false" />
<input id="object_boolean_attribute" name="object[boolean_attribute]" type="checkbox" value="true" />
UPD: Dealing with nested resources (Product accepts_nested_attributes_for :line_items)
= form_for @product, url: '' do |f|
  %p
    = f.label :title
    = f.text_field :title

  = f.fields_for :line_items do |li|
    = li.check_box :approved
    = li.label :approved, li.object.id
    %br
  = f.submit
Checking 2 of 3 checkboxes gives me the params as this:

{..., "product"=>{"title"=>"RoR book", "line_items_attributes"=>{"0"=>{"approved"=>"0", "id"=>"47"}, "1"=>{"approved"=>"1", "id"=>"48"}, "2"=>{"approved"=>"1", "id"=>"51"}}}, "commit"=>"Update Product", "action"=>"action1", "controller"=>"test"}

params as YAML for readability:

product:
  title: RoR book
  line_items_attributes:
    '0':
      approved: '0'
      id: '47'
    '1':
      approved: '1'
      id: '48'
    '2':
      approved: '1'
      id: '51'

See? No hidden fields but checked/unchecked states are clearly distinguished.

Having this params allows me to use one line of code to update associated line_items:
@product.update_attributes params[:product]
I hope it helps.

                        
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