How to add own validation message for accepts_nested_attributes_for?

I have these 2 models:


has_one :additional_data, :dependent => :destroy
accepts_nested_attributes_for :additional_data


belongs_to :user
validates :skype, :presence => {:message => 'cannot be blank.'}

and form:

<%= form_for@user do |f| %>
    <%= f.label :email %><br />
    <%= f.text_field :email %>
  <%= f.fields_for :additional_data do |ad| %>
          <%= ad.label :skype, "Skype" %><br />
          <%= ad.text_field :skype %>
  <% end %>
<% end %>

If I send empty form, the message about missing Skype data is not displayed. What am I missing?

Also, I would like to ask you, if I can according value in variable in URL validate the additional_data.


By default, Rails won't display inline errors.

You can either use a plugin like simple form which I recommend, or display the errors at the beginning of the form by iterating over @user.errors.full_messages.

Check out validates_associated. It validates whether the associated object or objects are all valid themselves.

# user.rb
has_one :additional_data, :dependent => :destroy

validates_associated :additional_data

accepts_nested_attributes_for :additional_data

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