ruby-on-rails – Rails：使用与验证中的模型无关的表单域

发布时间：2020-12-16 22:37:28 所属栏目：百科来源：网络整理

导读：在 Ruby on Rails应用程序中,我尝试使用与验证中的模型无关的字段中的信息. 这里是模型的一部分(整个模型已经变大了)： class Scorecard ActiveRecord::Base belongs_to :course belongs_to :user validate :attributes_consistency def attributes_consiste

在 Ruby on Rails应用程序中,我尝试使用与验证中的模型无关的字段中的信息.

这里是模型的一部分(整个模型已经变大了)：

class Scorecard < ActiveRecord::Base
  belongs_to :course
  belongs_to :user

  validate :attributes_consistency

  def attributes_consistency
    # Executed for all scorecards.  Checks if the user completed the hole attributes correctly
    if ( params[:no_fairways] and any_fairways? and !only_nine? ) or ( params[:no_fairways] and !any_h1_to_h9_score_blank and any_h1_to_h9_fairway? and only_nine? ) or ( params[:no_fairways] and !any_h10_to_h18_score_blank and any_h10_to_h18_fairway? and only_nine? )
      errors.add_to_base("You inidicated that you missed all the fairways,but you also marked one or more fairways in the scorecard.  Either uncheck the fairways mistakenly marked or uncheck the 'No fairways' checkbox.")
    end
    if ( params[:no_girs] and any_girs? and !only_nine? ) or ( params[:no_girs] and !any_h1_to_h9_score_blank and any_h1_to_h9_gir? and only_nine? ) or ( params[:no_girs] and !any_h10_to_h18_score_blank and any_h10_to_h18_gir? and only_nine? )
      errors.add_to_base("You inidicated that you missed all the greens,but you also marked one or more greens in the scorecard.  Either uncheck the marked greens on the scorecard or uncheck the 'No GIRs' checkbox.")
    end
  end # attributes_consistency


  def any_h1_to_h9_score_blank?
    h1_score.blank? or h2_score.blank? or h3_score.blank? or h4_score.blank? or h5_score.blank? or h6_score.blank? or h7_score.blank? or h8_score.blank? or h9_score.blank?
  end
  def any_h10_to_h18_score_blank?
    h10_score.blank? or h11_score.blank? or h12_score.blank? or h13_score.blank? or h14_score.blank? or h15_score.blank? or h16_score.blank? or h17_score.blank? or h18_score.blank?
  end

  def any_h1_to_h9_fairway?
    h1_fairway? or h2_fairway? or h3_fairway? or h4_fairway? or h5_fairway? or h6_fairway? or h7_fairway? or h8_fairway? or h9_fairway?
  end
  def any_h10_to_h18_fairway?
    h10_fairway? or h11_fairway? or h12_fairway? or h13_fairway? or h14_fairway? or h15_fairway? or h16_fairway? or h17_fairway? or h18_fairway?
  end

  def any_h1_to_h9_gir?
    h1_gir? or h2_gir? or h3_gir? or h4_gir? or h5_gir? or h6_gir? or h7_gir? or h8_gir? or h9_gir?
  end
  def any_h10_to_h18_gir?
    h10_gir? or h11_gir? or h12_gir? or h13_gir? or h14_gir? or h15_gir? or h16_gir? or h17_gir? or h18_gir?
  end

那么如何从模型中访问参数？

解决方法

不要让params潜入模型.在这种情况下,没有一个控制器的意义.相反,请从 Railscasts结帐这个情节,讲述虚拟属性不会进入数据库,但仍然可以用于验证.

您不需要虚拟属性的相应模型属性.将属性本地定义为保持状态的@no_fairways.

class ScoreCard < ActiveRecord::Base
  # define attributes and accessors for both fields
  attr_accessor :no_fairways,:no_girs

  ..
end

现在里面你可以写：

<% form_for @scorecard %>
  <%= f.check_box :no_fairways %>
<% end %>

（编辑：李大同）

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