Module: HasDuration::ActiveRecordExtension

Defined in:
lib/has_duration.rb

Instance Method Summary collapse

Instance Method Details

#has_duration(field_name) ⇒ Object

Adds a field to your ActiveRecord model that validates and serializes ActiveSupport::Duration objects, like: ‘1 year’, ‘2 seconds’, etc.

For example:

class VisitDuration < ActiveRecord::Base
  has_duration :doctor
  validates :doctor, presence: true
  has_duration :club
end

# ruby > durations = VisitDuration.create(doctor: 1.hour, club: 4.hours)
# ruby > Time.now
# => 2012-09-16 12:12:22 -0300 
# ruby > durations.doctor.from_now
# => 2012-09-16 13:12:22 -0300



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# File 'lib/has_duration.rb', line 50

def has_duration(field_name)
  serialize field_name, DurationSerializer
  validates field_name, duration: true

  define_method("#{field_name}_unit") do
    return instance_eval("@#{field_name}_unit") if instance_eval("@#{field_name}_unit")
    send(field_name).inspect.split(' ').last.singularize if send(field_name).is_a?(ActiveSupport::Duration)
  end

  define_method("#{field_name}_unit=") do |unit|
    return unless unit =~ /^(year|month|week|day|hour|minute|second)s?$/
    instance_eval "@#{field_name}_unit = '#{unit}'"
    if size = instance_eval("@#{field_name}_size")
      self.send("#{field_name}=", size.to_i.send(unit))
    end
  end

  define_method("#{field_name}_size") do
    return instance_eval("@#{field_name}_size") if instance_eval("@#{field_name}_size")
    send(field_name).inspect.split(' ').first if send(field_name).is_a?(ActiveSupport::Duration)
  end

  define_method("#{field_name}_size=") do |size|
    return unless size.to_s =~ /^(\d{0,10})$/
    instance_eval "@#{field_name}_size = '#{size}'"
    if unit = instance_eval("@#{field_name}_unit")
      self.send("#{field_name}=", size.to_i.send(unit))
    end
  end
end