Question

Is there any way to trigger validation only in specific forms(controller’s action), not globally at every save or update?
Something like User.create(:validate=>true) flag.

Answer 1

Yes, you can supply conditionals to the validations, eg:

validates_presence_of :something, :if => :special?

private

def make_sepcial
  @special = true
end

def special?
  @special
end

Now all you have to do to turn on these validations is:

s = SomeModel.new
s.make_special