Hi I'm trying to setup a validation that is only called in a specific form view, to do this I'm trying to create a hidden_field for a virtual attribute on the form and set this to a value, then validate :if the virtual attribute equals the value.
So far I have:
## user model
validates_presence_of :password_confirmation, :if => :confirmation_validation
attr_accessible :email, :password, :password_confirmation,
:remember_me, :name, :avatar, :username, :bio, :confirmation_validation
def confirmation_validation
# not sure what goes here???
end
## form view
<%= form_for(resource, :validate => true, :as => resource_name, :url => registration_path(resource_name), :html => { :method => :put }, :html => {:multipart => true}) do |f| %>
<%= devise_error_messages! %>
<p><%= f.label :password %> <i>(leave blank if you don't want to change it)</i><br />
<%= f.password_field :password %></p>
<p><%= f.label :password_confirmation %><br />
<%= f.password_field :password_confirmation %>
<% f.hidden_field :confirmation_validation, :value => 100%></p>
<p><%= f.submit "Update" %></p>
<% end %>
The value of the confirmation_validation
hidden field should be included in the params
hash, and also set the virtual attribute accordingly. Therefore, you can probably simply check whether or not the value has been set:
validates_presence_of :password_confirmation, :if => :should_confirm?
def should_confirm?
confirmation_validation == '100' # Value of the hidden field as set in the form
end