ruby on rails - How to display error messages in a multi-model form with transaction? -

two models, organization , user, have 1:many relationship. have combined signup form organization plus user organization signed up.

the problem i'm experiencing is: when submitting invalid information user, renders form again, should, error messages (such "username can't blank") user not displayed. form work when valid information submitted , display error messages organization, not user.

how should adjust code below error messages user displayed?

def new   @organization = organization.new   @user = @organization.users.build end  def create   @organization = organization.new(new_params.except(:users_attributes))    #validations require organization saved before user, since user requires organization_id. that's why users_attributs above excluded , why below it's managed in transaction rollbacks if either organization or user invalid. works desired.    @organization.transaction     if @organization.valid?         @organization.save         begin           # executed next line in debugger (with invalid user info), correctly responds with: activerecord::recordinvalid exception: validation failed: email can't blank, email invalid, username can't blank, etc.           @organization.users.create!(users_attributes)         rescue           # should perhaps add line here adds users errors memory?           raise activerecord::rollback         end      end   end    if @organization.persisted?     flash[:success] = "yeah!"     redirect_to root_url   else     @user = @organization.users.build(users_attributes)  # otherwise filled in information user gone (fields user empty)     render :new   end  end 

the form view includes:

<%= form_for @organization, url: next_url |f| %>     <%= render partial: 'shared/error_messages', locals: { object: f.object, nested_models: f.object.users } %>     <%= f.text_field :name %>         # other fields      <%= f.fields_for :users |p| %>         <%= p.email_field :email %>             # other fields     <% end %>      <%= f.submit "submit" %> <% end %> 

the error messages partial follows:

<% object.errors.full_messages.each |msg| %>   <li><%= msg.html_safe %></li> <% end %> 

update: following steps rob's answer arrived @ errors partial below. still not display error messages user. added debugger responses inside code below , reason nested_model.errors.any? returns false, while debugger inside controller (see above) return error messages user.

<% if object.errors.any? %>   <div id="error_explanation">     <div class="alert alert-danger">       form contains <%= pluralize(object.errors.count, "error") %>.     </div>      <ul>       <% object.errors.full_messages.each |msg| %>         <li><%= msg.html_safe %></li>       <% end %>     </ul>    </div> <% end %>  <% if defined?(nested_models) && nested_models.any? %>   # debugger: responds "local-variable" "defined?(nested_models)" , "nested_models.any?" returns true.   <div id="error_explanation">     <ul>       <% nested_models.each |nested_model| %>       # debugger: "nested_model" has same values "nested_models.any?", expect. "nested_model.errors.any?" returns false, shouldn't.         <% if nested_model.errors.any? %>    #initially had "unless nested_model.valid?" errors user displayed on loading form page (new method).           <ul>             <% nested_model.errors.full_messages.each |msg| %>               <li><%= msg.html_safe %></li>             <% end %>           </ul>         <% end %>       <% end %>     </ul>   </div> <% end %> 

try adding validates_associated :users under has_many :users association in organization.

http://apidock.com/rails/activemodel/validations/classmethods/validates_associated