Class: ActiveRecord::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/time_period/active_record.rb

Overview

Time periods

monkey patch ActiveRecord::Base

© 2012 Peter Horn, metaminded UG

Class Method Summary collapse

Class Method Details

.time_period(name, oopts) ⇒ Object 



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# File 'lib/time_period/active_record.rb', line 10

def self.time_period(name, oopts)
  opts = {validate: true, default: nil}.merge oopts

  define_method "#{name}_number" do
    read_attribute(name).split(" ").first.to_i
  end

  define_method "#{name}_unit" do
    read_attribute(name).split(" ").last
  end

  define_method "#{name}_value" do
    n, p = read_attribute(name).split(" ")
    case p
    when 'week'  then n.to_i.week
    when 'month' then n.to_i.month
    when 'day'   then n.to_i.day
    when 'year'  then n.to_i.year
    else raise "wrong format"
    end
  end

  define_method "#{name}_number=" do |number|
    n,p = read_attribute(name).split(" ")
    p ||= 'day'
    write_attribute(name, "#{number.to_i} #{p}")
    number
  end

  define_method "#{name}_unit=" do |unit|
    n,p = read_attribute(name).split(" ")
    raise "unsupported unit '#{unit}'" unless %w{day week month year}.member?(unit.to_s)
    write_attribute(name, "#{n.to_i} #{unit}")
    unit
  end

  define_method "#{name}=" do |n_u|
    number,unit = if n_u.is_a?(String)
      n_u.split(" ")
    elsif n_u.is_a?(ActiveSupport::Duration)
      u,n = n_u.parts.flatten
      [n.to_i, u.to_s.singularize]
    else raise "Can't assign '#{n_u}' to '#{name}'."
    end
    raise "unsupported unit '#{unit}'" unless %w{day week month year}.member?(unit.to_s)
    write_attribute(name, "#{number.to_i} #{unit}")
    n_u
  end

  validates_format_of(name, :with => /^\d+ ((day)|(week)|(month)|(year))$/) if opts[:validate]

  before_validation do
    self.send("#{name}=", opts[:default]) unless read_attribute(name).present?
  end if opts[:default]

end