Rails嵌套表单错误,子必须存在

Question

我正在关注教程:http://www.amooma.de/screencasts/2015-01-22-nested_forms-rails-4.2/

我正在使用Rails 5.0.0.1

但是当我注册酒店时,似乎酒店类别必须存在.

1错误禁止此酒店被保存:类别酒店必须存在

我的酒店型号:

class Hotel < ApplicationRecord
    has_many :categories, dependent: :destroy
    validates :name, presence: true
    accepts_nested_attributes_for :categories, reject_if: proc { |attributes| attributes['name'].blank? }, allow_destroy: true
end

我的分类型号:

class Category < ApplicationRecord
  belongs_to :hotel
  validates :name, presence: true
end

我的酒店管理员:

def new
    @hotel = Hotel.new
    @hotel.categories.build
end

def hotel_params
   params.require(:hotel).permit(:name, categories_attributes: [ :id,:name])
end

结束我的_form.html.erb

<%= f.fields_for :categories do |category| %>  
    <div class="room_category_fields">  
      <div class="field">
        <%= category.label :name %><br>
        <%= category.text_field :name %>
      </div>
    </div>
 <% end %>

Answer 1

belongs_to行为发生了变化rails >= 5.x.基本上,现在预期belongs_to记录在将其分配给关联的另一侧之前存在.您需要在模型中required :false声明belongs_to时传递Category,如下所示:

class Category < ApplicationRecord
  belongs_to :hotel, required: false
  validates :name, presence: true
end