Untitled

## Grade.rb

 

 

class Grade < ActiveRecord::Base

 

  validates_inclusion_of :letter, :in => %w( A B C D F )

  before_save :translate_letter_to_score

  belongs_to :user

  validates_presence_of :user

  validate :user_has_not_cast_grade_today

 

  attr_accessor :letter

 

  def self.decimal_average

    self.average('score').round(2)

  end

 

  def self.letter_average

    { 4 => "A", 3 => "B", 2 => "C", 1 => "D", 0 => "F"}[Grade.decimal_average.round]

  end

 

  def translate_letter_to_score

    self.score = { "A" => 4, "B" => 3, "C" => 2, "D" => 1, "F" => 0}[letter]

  end

 

  private

 

  def user_has_not_cast_grade_today

    errors.add(:base, "Nice try, but you've already graded the President today! Come back tomorrow :-)") if user.grades.exists?(:created_at => DateTime.current.beginning_of_day..DateTime.current)

  end

end

 

 

# == Schema Information

#

# Table name: grades

#

#  id         :integer         not null, primary key

#  score      :float

#  created_at :datetime

#  updated_at :datetime

#  user_id    :integer

#