Rails conditional validation based on a given Model

Question

I didn't define the problem correctly the first time. I tried to make a simple example and failed. Let's try again :)

I have an Address Model that validates the street, city, state, and zip attributes all exist. Then we have a Person Model that has a one to many relationship with Address. We have a student model but it DOESN'T inherit off person, it just has_one (I didn't completely understand how inheritance worked in ruby when I started). We have a Classroom model that also has_on person (again, not inherited.) So the issue is we want to require an address for the student, but not the Classroom. Hopefully this is a little more clear now. Thanks!

If you do understand how inheritance works now, why Student is still not inheriting from Person ? — Benoît
– Benoît, Commented Nov 13, 2012 at 5:55
possible duplicate of Rails - Validate Presence Of Association? — chris
– chris, Commented Nov 14, 2012 at 3:12

Benoît · Accepted Answer · 2012-11-13 04:50:10Z

1

You can use validates or validates_presence_of in only your Student model.

class Person
  has_many :addresses
end

class Student < Person
  validates :addresses, :presence => true
end

class Teacher < Person
end

edited Nov 13, 2012 at 4:50

answered Nov 13, 2012 at 4:23

Benoît

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1 Comment

Lister Over a year ago

After thinking about it, I could have another model that doesn't validate address and make the Classroom has_one of those. This is acceptable, just took me a lil while to wrap my head around it!

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