Question

在rails 5中设置多态关系时出现NoMethod错误。

我已按照此处的说明进行操作：https://guides.rubyonrails.org/association_basics.html#polymorphic-associations

我正在运行5.2

这是我的模特：

class Image < ApplicationRecord
    belongs_to :imageable, polymorphic: true
    validates :url,  :presence => true
end

class Trip < ApplicationRecord
  validates :name,  :presence => true
  # validates :start_date,  :presence => true
  # validates :end_date,  :presence => true
  belongs_to :user
  has_many :todo, :dependent => :destroy
  has_many :destination, :dependent => :destroy
  has_many :events, through: :destination
  has_many :image, as: :imageable

  def formatted_arrival_time
    self.arrival_time.strftime("%H:%M")
  end

  def formatted_departure_time
    self.departure_time.strftime("%H:%M")
  end
end

class Destination < ApplicationRecord
  validates :title,  :presence => true
  belongs_to :trip
  has_many :event, :dependent => :destroy
  has_many :image, as: :imageable
end

然后在我的控制器中：

# GET /images
        def index_trip
            if params[:page] && params[:per_page]
              trip = Trip.find(params[:trip_id])
              @images = Trip.image.all

              paginate json: @images, meta: {
                total: @images.count,
                per_page: params[:per_page].to_i, 
                page: params[:page].to_i,
                pages: (@images.count / params[:per_page].to_f).ceil
              }
            else
                trip = Trip.find(params[:trip_id])
                @images = Trip.image.all

              render json: @images
            end
        end

任何关于我在这里做错事情的想法将不胜感激。

Answer 1

结果发现Trip上的小写字母应该是“ trip”

即使我已经设置了关系，也要为多态关系获取未定义的方法

1 个答案: