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PORuby on Rails: How to validate nested attributes on certain condition?
 

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    <p>I have these models:</p> <pre><code>class Organisation &lt; ActiveRecord::Base has_many :people has_one :address, :as =&gt; :addressable, :dependent =&gt; :destroy accepts_nested_attributes_for :address, :allow_destroy =&gt; true end class Person &lt; ActiveRecord::Base attr_accessible :first_name, :last_name, :email, :organisation_id, :address_attributes belongs_to :user belongs_to :organisation has_one :address, :as =&gt; :addressable, :dependent =&gt; :destroy accepts_nested_attributes_for :address, :allow_destroy =&gt; true # These two methods seem to have no effect at all! validates_presence_of :organisation, :unless =&gt; "address.present?" validates_associated :address, :unless =&gt; "organisation.present?" end class Address &lt; ActiveRecord::Base belongs_to :addressable, :polymorphic =&gt; true validates_presence_of :line1, :line2, :city, :zip end </code></pre> <p>...and these views:</p> <p><strong>_fields.html.erb</strong>:</p> <pre><code>&lt;%= render 'shared/error_messages', :object =&gt; f.object %&gt; &lt;fieldset&gt; &lt;div class="left"&gt; &lt;%= f.label :first_name %&gt;&lt;br/&gt; &lt;%= f.text_field :first_name %&gt; &lt;/div&gt; &lt;div&gt; &lt;%= f.label :last_name %&gt;&lt;br/&gt; &lt;%= f.text_field :last_name %&gt; &lt;/div&gt; &lt;div&gt; &lt;%= f.label :email %&gt;&lt;br/&gt; &lt;%= f.text_field :email %&gt; &lt;/div&gt; &lt;div&gt; &lt;%= f.label :organisation_id %&gt;&lt;br/&gt; &lt;%= f.select(:organisation_id, current_user.organisation_names, {:include_blank =&gt; "--- None ---"}, :id =&gt; 'organisation_select') %&gt; &lt;/div&gt; &lt;/fieldset&gt; &lt;%= f.fields_for :address do |address| %&gt; &lt;%= render 'shared/address', :f =&gt; address %&gt; &lt;% end %&gt; </code></pre> <p><strong>_address.html.erb:</strong></p> <pre><code>&lt;fieldset id="address_fields"&gt; &lt;div&gt; &lt;%= f.label :line1 %&gt; &lt;%= f.text_field :line1 %&gt; &lt;/div&gt; &lt;div&gt; &lt;%= f.label :line2 %&gt; &lt;%= f.text_field :line2 %&gt; &lt;/div&gt; &lt;div&gt; &lt;%= f.label :zip %&gt; &lt;%= f.text_field :zip %&gt; &lt;/div&gt; &lt;div&gt; &lt;%= f.label :city %&gt; &lt;%= f.text_field :city %&gt; &lt;/div&gt; &lt;/fieldset&gt; </code></pre> <p><strong>people_controller.rb</strong>:</p> <pre><code>def new puts params.inspect @person = Person.new(:organisation_id =&gt; params[:organisation_id]) @person.build_address @title = "New person" end {"action"=&gt;"new", "controller"=&gt;"people"} def edit puts params.inspect @title = @person.name end {"action"=&gt;"edit", "id"=&gt;"69", "controller"=&gt;"people"} def create puts params.inspect if params[:organisation_id] @person = current_user.organisations.build_person(params[:person]) else @person = current_user.people.build(params[:person]) end if @person.save flash[:success] = "Person created." redirect_to people_path else render :action =&gt; "new" end end {"commit"=&gt;"Create", "action"=&gt;"create", "person"=&gt;{"last_name"=&gt;"Doe", "organisation_id"=&gt;"9", "email"=&gt;"john.doe@email.com", "first_name"=&gt;"John", "address_attributes"=&gt;{"city"=&gt;"Chicago", "zip"=&gt;"12345", "line2"=&gt;"Apt 1", "line1"=&gt;"1 Main Street"}}, "authenticity_token"=&gt;"Jp3XVLbA3X1SOigPezYFfEol0FGjcMHRTy6jQeM1OuI=", "controller"=&gt;"people", "utf8"=&gt;"✓"} </code></pre> <p>Inside my <code>Person</code> model I need to make sure that only if a person's <code>organisation_id</code> is blank, that person's address fields have to be present.</p> <p>I tried something like this:</p> <pre><code>validates :address, :presence =&gt; true, :if =&gt; "organisation_id.blank?" </code></pre> <p>But it's not working.</p> <p>How can this be done?</p> <p>Thanks for any help.</p>
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