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 error prohibited this hotel from being saved: Categories hotel must
exist

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 %>