1

必要なビュー機能をサポートするために、これらのメソッドを ActiveRecord モデルに実装する必要がありました。

Array#eachこれらのメソッドを宣言するには、おそらくシンボルの配列と呼び出しを含む、よりコンパクトな方法が必要だと考えています。

助言がありますか？

(これらは従来の列名です。)

class Contract < ActiveRecord::Base

  def start_date_displayed
    self.start_date.present? ? self.start_date.strftime("%-m/%-d/%Y") : ''
  end

  def start_date_displayed=(input)
    if input.present?
      self.start_date = Date.strptime input, '%m/%d/%Y'
    end
  end

  def end_date_displayed
    self.end_date.present? ? self.end_date.strftime("%-m/%-d/%Y") : ''
  end

  def end_date_displayed=(input)
    if input.present?
      self.end_date = Date.strptime input, '%m/%d/%Y'
    end
  end

  def ArrivalDate_displayed
    self.ArrivalDate.present? ? self.ArrivalDate.strftime("%-m/%-d/%Y") : ''
  end

  def ArrivalDate_displayed=(input)
    if input.present?
      self.ArrivalDate = Date.strptime input, '%m/%d/%Y'
    end
  end

  def Contract_ReceivedDate_displayed
    self.Contract_ReceivedDate.present? ? self.Contract_ReceivedDate.strftime("%-m/%-d/%Y") : ''
  end

  def Contract_ReceivedDate_displayed=(input)
    if input.present?
      self.Contract_ReceivedDate = Date.strptime input, '%m/%d/%Y'
    end
  end

  def Contract_FinalizedDate_displayed
    self.Contract_FinalizedDate.present? ? self.Contract_FinalizedDate.strftime("%-m/%-d/%Y") : ''
  end

  def Contract_FinalizedDate_displayed=(input)
    if input.present?
      self.Contract_FinalizedDate = Date.strptime input, '%m/%d/%Y'
    end
  end

  def Committee_Date_displayed
    self.Committee_Date.present? ? self.Committee_Date.strftime("%-m/%-d/%Y") : ''
  end

  def Committee_Date_displayed=(input)
    if input.present?
      self.Committee_Date = Date.strptime input, '%m/%d/%Y'
    end
  end

  # ...

end
4

2 に答える 2

2 
class Contract < ActiveRecord::Base

  %w(start_date end_date).each do |attr_name|
     class_eval <<-METHOD_DEF
         def #{attr_name}_displayed
             self.#{attr_name}.present? ? self.#{attr_name}.strftime("%-m/%-d/%Y") : ''
         end

         def #{attr_name)_displayed=(input)
            if input.present?
              self.#{attr_name} = Date.strptime #{attr_name}, '%m/%d/%Y'
            end
         end


     METHOD_DEF
  end
end

名前が日付で終わる列に対してのみこれらのメソッドを定義する場合、

class Contract < ActiveRecord::Base

   self.column_names.grep(/date$/i).each do |column_name|

     class_eval <<-METHOD_DEF
         def #{column_name}_displayed
             self.#{column_name}.present? ? self.#{column_name}.strftime("%-m/%-d/%Y") : ''
         end

         def #{column_name)_displayed=(input)
            if input.present?
              self.#{column_name} = Date.strptime #{column_name}, '%m/%d/%Y'
            end
         end             
     METHOD_DEF

  end
end
于 2012-05-03T04:29:08.510 に答える
1

可能であれば、単純な評価を避けることをお勧めします。

class Contract < ActiveRecord::Base
  class << self
    def attr_displayed *attrs
      attrs.each do |attr|
        displayed = :"#{attr}_displayed"

        define_method displayed do
          send(attr).present? ? send(attr).strftime("%-m/%-d/%Y") : ''
        end

        define_method :"#{displayed}=" do |input|
          if input.present?
            send :"#{attr}=", Date.strptime(input, '%m/%d/%Y')
          end
        end
      end
    end
  end

  attr_displayed :start_date, :end_date, :ArrivalDate, :Committee_Date,
                 :Contract_ReceivedDate, :Contract_FinalizedDate
end
于 2012-05-03T06:42:56.063 に答える