I'm working on a model that has two associations that need to be set when an object is created, EXCEPT in one case.
Basically, it needs to work like this.
class Example < ActiveRecord::Base
has_one :foo
has_one :bar
validates_presence_of :foo
validates_presence_of :bar, :unless => :foo == Foo.find_by_name('ThisFooDoesntLikeBars')
end
I'm not sure how to build the :unless condition here, as it needs to check whether :foo is a specific object or not.
How do you do something like this?
:unless
accepts a Proc
validates_presence_of :bar, :unless => Proc.new { |ex| ex.foo == Foo.find_by_name('ThisFooDoesntLikeBars') }
:unless - Specifies a method, proc or string to call to determine if the validation should not occur (e.g. :unless => :skip_validation, or :unless => Proc.new { |user| user.signup_step <= 2 }). The method, proc or string should return or evaluate to a true or false value.
http://api.rubyonrails.org/classes/ActiveRecord/Validations/ClassMethods.html
How about the following:
class Example < ActiveRecord::Base
has_one :foo
has_one :bar
validates_presence_of :foo
validates_presence_of :bar, :unless => Proc.new { |example| example.foo == Foo.find_by_name('ThisFooDoesntLikeBars') }
end
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