Rails - Sep 2007 - Validating a form by verifying two attributes in a related table

I have a table called Contracts that includes the Name and Contact
Information for all my Independent Contractors. Each Independent
Contractor (IC) will have many [work] Schedules. The IC has to submit
a schedule every week, but I do not want to setup a complicated
authentication system that is hard to maintain.  So, I''d like to have
a simple form where the ICs must pick their name from a list and
manually type in their own ZIP code to let the program know it is
actually them submitting the form.

My question is how can I validate the form by checking that the ZIP
code matches the name picked (which both reside in my contracts table)
before allowing the IC to create the schedule? I would imagine I would
have to create a custom ''validate'' method in my Schedules
model, but
I''m not sure how to begin.

Cheers,
Brad


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Hi

I guess you have a model that looks like this

class Schedule < ActiveRecord::Base
  ..
  belongs_to :contract
  ..
end

First, you seem to need to add

attr_accessor :contractor_zip

so that you''ll be able to put a field to enter the zip code in the
form.

Then you can write your custom validation method:

def validate
  errors.add(:contractor_zip, ''is invalid'') unless
contract.zip =contractor_zip
end

I didn''t test this code, but it should check whether the zip of the
associated contract is equal to the zip entered in the form. I also
assume that the drop down with contractor names will populate the
contract_id field of the Schedule model.

Hope that helps
Eugene

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Hi Eugene,

Sorry, I could have offered more information.  My tables are actually
a bit more complicated than I led on, so I had to modify the validate
method a little bit.

I have 3 tables:
*Applicants (has_one :contract)
*Contracts (belongs_to :applicant)
*Schedules (belongs_to :contract)

Applicants table actually contains the ZIP code (Before they are
contracted, the apply and contact information is stored in the
applicants table).

I had to modify the validate method to be able to link through the
contracts table to my applicants table.  It seems to be working
though!

  attr_accessor :contract_zip

  def validate
    errors.add(:contract_zip, ''is invalid'') unless
contract.applicant.zip == contract_zip
  end

I never really understood attr_accessor until now.  Thanks SO much for
your help!


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