Ruby on rails 3 Rails 3嵌套属性和访问关联属性
我有以下情况: 一种产品可以由不同的供应商以给定的价格出售。 在我的产品表单中,我希望通过复选框和 为所选供应商指定价格 我的模型: product.rbRuby on rails 3 Rails 3嵌套属性和访问关联属性,ruby-on-rails-3,associations,nested-attributes,Ruby On Rails 3,Associations,Nested Attributes,我有以下情况: 一种产品可以由不同的供应商以给定的价格出售。 在我的产品表单中,我希望通过复选框和 为所选供应商指定价格 我的模型: product.rb class Product < ActiveRecord::Base belongs_to :price has_many :providers, through: :price accepts_nested_attributes_for :providers, :price end # == Schema Inform
class Product < ActiveRecord::Base
belongs_to :price
has_many :providers, through: :price
accepts_nested_attributes_for :providers, :price
end
# == Schema Information
#
# Table name: products
#
# id :integer not null, primary key
# name :string(255)
# isbn :integer
# created_at :datetime not null
# updated_at :datetime not null
class Provider < ActiveRecord::Base
belongs_to :price
has_many :products, through: :price
end
# == Schema Information
#
# Table name: providers
#
# id :integer not null, primary key
# name :string(255)
# created_at :datetime not null
# updated_at :datetime not null
class Price < ActiveRecord::Base
belongs_to :product
belongs_to :provider
end
# == Schema Information
#
# Table name: prices
#
# id :integer not null, primary key
# value :decimal(, )
# created_at :datetime not null
# updated_at :datetime not null
# product_id :integer
# provider_id :integer
<%= form_for(@product) do |f| %>
...
<div class="field">
<% Provider.all.each do |provider| %>
<%= check_box_tag "product[provider_ids][]", provider.id, @product.provider_ids.include?(provider.id), id: dom_id(provider) %>
<%= label_tag dom_id(provider), provider.name %>
<% end %>
<% f.fields_for :price do |price_form| %>
<%= price_form.text_field :value %>
<% end %>
<br>
</div>
...
你需要改变
<% f.fields_for :price do |price_form| %>
<%= price_form.text_field :value %>
<% end %>
到
将产品类别中的更改为中的所属:price
。对于表中有attribute\u id
的模型,您应该使用attribute\u to:attribute
方法。对不起,这只是一个输入错误。但这并没有造成问题。
can't write unknown attribute `price_id'
<% f.fields_for :price do |price_form| %>
<%= price_form.text_field :value %>
<% end %>
<%= f.fields_for :price do |price_form| %>
<%= price_form.text_field :value %>
<% end %>