rails 复选框 check_box_tag

1. <%= error_messages_for 'product' %>  
2.   
3. <p>  
4.   Name<br/>  
5.   <%= text_field :product, :name %>  
6. </p>  
7.   
8. <p>  
9.   Price<br/>  
10.   <%= text_field :product, :price %>  
11. </p>  
12.   
13. <p>  
14.   <% for category in Category.find(:all) %>  
15.   <div>  
16.     <%= check_box_tag "product[category_ids][]", category.id, @product.categories.include?(category) %>  
17.     <%= category.name %>  
18.   </div>  
19.   <% end %>  
20. </p>  

check_box_tag 'accept'
# => <input id="accept" name="accept" type="checkbox" value="1" />

check_box_tag 'rock', 'rock music'
# => <input id="rock" name="rock" type="checkbox" value="rock music" />

check_box_tag 'receive_email', 'yes', true
# => <input checked="checked" id="receive_email" name="receive_email" type="checkbox" value="yes" />

check_box_tag 'tos', 'yes', false, class: 'accept_tos'
# => <input class="accept_tos" id="tos" name="tos" type="checkbox" value="yes" />

check_box_tag 'eula', 'accepted', false, disabled: true
# => <input disabled="disabled" id="eula" name="eula" type="checkbox" value="accepted" />

通过 value 的值可判断check_box是否存在