Date Range Params Concern WIP

date_range_params.rb

module DateRangeParams
  extend ActiveSupport::Concern

  included do
    helper_method :start_date
    helper_method :end_date
    helper_method :date_range

    def self.set_default_end_date(&block)
      @default_end_date = block
    end

    def self.set_default_start_date(&block)
      @default_start_date = block
    end

    # Defaults to a week before the end date
    def self.default_start_date
      @default_start_date || Proc.new { end_date - 7 }
    end

    # Defaults to `today`
    def self.default_end_date
      @default_end_date || Proc.new { today }
    end
  end

  def date_range
    start_date..end_date
  end

  def start_date
    @start_date ||= Date.parse(params[:from] || '')
  rescue ArgumentError
    @start_date ||= instance_eval(&self.class.default_start_date)
  end

  def end_date
    @end_date ||= Date.parse(params[:to] || '')
  rescue ArgumentError
    @end_date ||= instance_eval(&self.class.default_end_date)
  end
end