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您如何评价同一对象的多个属性？

发布于 2024-08-19 12:26:09 字数 124 浏览 5 评论 0原文

我还没有看到这个功能作为插件，并且想知道如何实现它，希望使用 Rails。

我所追求的功能是能够在一页/表格上通过各种属性（例如情节、娱乐性、原创性等）对一个对象（一部电影）进行评级。

有人可以帮忙吗？

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め可乐爱微笑 2024-08-26 12:26:09

我不认为你需要一个插件来做到这一点...你可以使用 AR 执行以下操作

class Film < ActiveRecord::Base
  has_many :ratings, :as => :rateable

  def rating_for(field)
    ratings.find_by_name(field).value
  end

  def rating_for=(field, value)
    rating = nil
    begin
      rating = ratigns.find_by_name(field)
      if rating.nil?
        rating = Rating.create!(:rateable => self, :name => field, :value => value)
      else
        rating.update_attributes!(:value => value)
      end
    rescue ActiveRecord::RecordInvalid
      self.errors.add_to_base(rating.errors.full_messages.join("\n"))
    end
  end

end

class Rating < ActiveRecord::Base
  # Has the following field:
  # column :rateable_id, Integer
  # column :name, String
  # column :value, Integer
  belongs_to :rateable, :polymorphic => true
  validates_inclusion_of :value, :in => (1..5)
  validates_uniqueness_of :name, :scope => :rateable_id

end

当然，通过这种方法，你可以在评级名称中进行复制，这并不是那么糟糕（标准化表格只是为了一个字段并不能解决问题）。

I don't think you need a plugin to do just that... you could do the following with AR

class Film < ActiveRecord::Base
  has_many :ratings, :as => :rateable

  def rating_for(field)
    ratings.find_by_name(field).value
  end

  def rating_for=(field, value)
    rating = nil
    begin
      rating = ratigns.find_by_name(field)
      if rating.nil?
        rating = Rating.create!(:rateable => self, :name => field, :value => value)
      else
        rating.update_attributes!(:value => value)
      end
    rescue ActiveRecord::RecordInvalid
      self.errors.add_to_base(rating.errors.full_messages.join("\n"))
    end
  end

end

class Rating < ActiveRecord::Base
  # Has the following field:
  # column :rateable_id, Integer
  # column :name, String
  # column :value, Integer
  belongs_to :rateable, :polymorphic => true
  validates_inclusion_of :value, :in => (1..5)
  validates_uniqueness_of :name, :scope => :rateable_id

end

Of course, with this approach you would have a replication in the Rating name, something that is not that bad (normalize tables just for one field doesn't cut it).

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