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POHow do you validate the presence of one field from many
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copied!<p>I'm answering my own questions - just putting this up here for google-fu in case it helps someone else. This code allows you to validate the presence of one field in a list. See comments in code for usage. Just paste this into lib/custom_validations.rb and add require 'custom_validations' to your environment.rb</p> <pre><code>#good post on how to do stuff like this http://www.marklunds.com/articles/one/312 module ActiveRecord module Validations module ClassMethods # Use to check for this, that or those was entered... example: # :validates_presence_of_at_least_one_field :last_name, :company_name - would require either last_name or company_name to be filled in # also works with arrays # :validates_presence_of_at_least_one_field :email, [:name, :address, :city, :state] - would require email or a mailing type address def validates_presence_of_at_least_one_field(*attr_names) msg = attr_names.collect {|a| a.is_a?(Array) ? " ( #{a.join(", ")} ) " : a.to_s}.join(", ") + "can't all be blank. At least one field (set) must be filled in." configuration = { :on => :save, :message => msg } configuration.update(attr_names.extract_options!) send(validation_method(configuration[:on]), configuration) do |record| found = false attr_names.each do |a| a = [a] unless a.is_a?(Array) found = true a.each do |attr| value = record.respond_to?(attr.to_s) ? record.send(attr.to_s) : record[attr.to_s] found = !value.blank? end break if found end record.errors.add_to_base(configuration[:message]) unless found end end end end end </code></pre>

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