[PhillyOnRails] Handling validation failures on hasmany through records

[Will Merrell <will@coaching-life.com>]

Hi all,

I am fairly new to Ruby and RoR but am making pretty good progress. But 
this has me stumped and I wonder if anyone can point me in the right 
direction. I haven't been able to find any examples on the web that 
shine the light on this yet.

I have a very simple hasmany :through model as follows:

class Member < ActiveRecord::Base
 has_many :member_phones, :dependent => :destroy
 has_many :phones, :through => :member_phones
 validates_exclusion_of :first_name, :in => [ "Bozo"], :message => "You 
don't belong here"
end

class MemberPhone < ActiveRecord::Base
 belongs_to :member
 belongs_to :phone
 validates_exclusion_of :name, :in => [ "Foobar" ], :message => "No 
Foobar Allowed"
end

class Phone < ActiveRecord::Base
 has_many :member_phones
 has_many :people, :through => :member_phones
end

And this all works fine. The application can do all the CRUD functions, 
and the validations really fail when they should.

My problem is that if I enter a phone named Foobar, it will fail to add 
the record just as it should, but it does so silently. I cannot figure 
out how to display an error message for it.

I can use <%= error_messages_for 'member' %> to display the error 
message if I add a member with a first name of Bozo, but I can't figure 
out how to get hold of the error message for the phone.

Does anyone know how to get and display the error messages on these 
associated tables?

--Will




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