Rails state_machine - conditional validation?

Question

When using state_machine, how can you conditionally validate fields in the below way?

state :unlit do      
end

state :fire do
  if is_big_fire?
    validates_presence_of :big_log
  end
  if is_small_fire?
    validates_presence_of :small_log
  end
end

It seems to just ignore the if conditions and validate everything inside the state D:

The only sort of solution I came up with was

validates_presence_of :big_log, :if  => Proc.new { |fire| fire.is_big_fire? }

But this gets nuts if there are more validations.

validates_presence_of :big_log, :if  => Proc.new { |fire| fire.is_big_fire? }
validates :fire_epicness_rating, :inclusion => { :in => %w(epic whowa RUNFORTHEHILLS) }, :if  => Proc.new { |fire| fire.is_big_fire? }
etc

Is there some nice way of neatly wrapping these in if blocks?

apneadiving · Accepted Answer · 2011-10-25 15:39:27Z

3

Grouping validations thanks to with_optionsis really neat. See here.

answered Oct 25, 2011 at 15:39

apneadiving

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Sam Stange · Accepted Answer · 2013-07-11 17:05:20Z

2

Here's an example using the with_options for group validation.

  with_options :if => :driver? do |driver|
    driver.validates_presence_of :truck_serial
    driver.validates_length_of :truck_serial, :maximum => 30
  end

  def driver?
    roles.any? { |role| role.name == "driver" }
  end

Source: http://rubyquicktips.com/post/411400798/conditional-validation-using-with-options-to-improve

answered Jul 11, 2013 at 17:05

Sam Stange

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