所以我有一个类别模型
class Category < ActiveRecord::Base
has_many :provider_categories
has_many :providers, :through => :provider_categories
end
和提供者模型
class Provider < ActiveRecord::Base
has_many :provider_categories
has_many :categories, :through => :provider_categories
accepts_nested_attributes_for :provider_categories, :allow_destroy => true
end
这是我的provider_category模型
class ProviderCategory < ActiveRecord::Base
belongs_to :provider
belongs_to :category
end
我试图创建一个嵌套表单,将类别包含在提供者表单中
= form_for @provider do |f|
...
-@categories.each.with_index do |category,index|
=f.fields_for :provider_category, category do |pl|
=pl.check_box :category_id
=pl.label category.name
=pl.hidden_field :provider_id, value: @provider.id
当我加载页面时,复选框不合作
undefined method `category_id' for #<Category:0x0000010184ff60>
修改
如果我将:category_id更改为id它可以工作,但html outpuy看起来像这样
<input name="provider[provider_category][id]" type="hidden" value="0"><input checked="checked" id="provider_provider_category_id" name="provider[provider_category][id]" type="checkbox" value="1">
<label for="provider_provider_category_Acupuncture">Acupuncture</label>
<input id="provider_provider_category_provider_id" name="provider[provider_category][provider_id]" type="hidden" value="1">
编辑2:
我最终使用了check_box_tag
-@categories.each.with_index do |category|
=f.fields_for :provider_category, category do |pl|
.li
=check_box_tag "provider[provider_category][category_id]", category.id
=pl.label category.name
=pl.hidden_field :provider_id, value: @provider.id
现在html输出似乎是正确的,但它没有保存它。当我选择多个项目时,这是保存的哈希值
"provider"=>{"name"=>"Mr. Awesome", "phone"=>"999-999-9999", "email"=>"awesome@awesome.com", "address"=>"awesome land", "provider_category"=>{"category_id"=>"3", "provider_id"=>"1"}}, "commit"=>"Save", "id"=>"1"}
我确实选择了3个选项,但只将最后一个添加到哈希
我还在提供者控制器的强参数中添加了提供者类别
params.require(:provider).permit(..., :provider_categories => [:category_id, :provider_id])
感谢您的帮助
答案 0 :(得分:1)
根据您的模型定义,ProviderCategory
具有category_id
和provider_id
属性。你收到的错误是:
undefined method `category_id' for #<Category:0x0000010184ff60>
因为您没有传递ProviderCategory
的实例,而是传递了Category
类的实例。注意在{/ p>中传递category
=f.fields_for :provider_category, category do |pl|
并且因为模型category_id
中没有名为Category
的属性,您会收到错误。
要解决此问题,只需在视图中更新fields_for
方法调用,如下所示:
=f.fields_for :provider_categories, category.provider_categories.build do |pl|
<强>更新强>
此外,您必须更新ProvidersController
的强参数,以便provider_categories
的记录在数据库中正确保存:
params.require(:provider).permit(..., :provider_categories_attributes => [:category_id, :provider_id])
使用provider_categories_attributes
而非provider_categories
更新2
OP还有另一个问题,因为未经检查category_id
,正在传递值0
,category_id
设置为0
的错误记录已在{{1}中创建}。
建议将provider_categories
选项传递给reject_if
模型中的accepts_nested_attributes_for
方法,以拒绝这些记录,如下所示:
Provider
复选框未传递已检查类别的ID,建议更新复选框代码,如下所示:
class Provider < ActiveRecord::Base
has_many :provider_categories
has_many :categories, :through => :provider_categories
accepts_nested_attributes_for :provider_categories, :allow_destroy => true, reject_if: proc { |attributes| attributes['category_id'] == "0" }
end