rails : displaying error messages on a form -


i have 'modif' action, activated link, loads data database, displays form via 'modif' view. form linked @newaut. on form, link leads 'modifvalid' action. operates tests on data entered , may return error message. in case of error, if redirect 'modif' action display error, data come original values, changes on form lost, , error displayed. so, render 'modif view. @newaut doesn't exist anymore, must reload params data. result ok. there way display error message without reloading data entered on form. thanks.

    def modif       @zgtitre="modification d'un auteur"       @newaut=auteur.find(params[:id])     end      def modifvalid       @newaut=auteur.find(params[:auteur][:id])       @newaut[:autabr]= params[:auteur][:autabr].upcase       @newaut[:autnom]= params[:auteur][:autnom]       inderr=0       flash[:meserr]=""       if .....         flash[:meserr]="xxxxx"         inderr=1       end       if inderr==1         @zgtitre="modification d'un auteur après erreur"         render :modif         return       else         @newaut.save         redirect_to lister_les_auteurs_path       end     end      <%= form_for @newaut, url: {action: "modifvalid"}, method: :post |f| %>     <%= f.hidden_field :id %>     <div class="field">       <%= f.label :nom %><br>       <%= f.text_field :autnom %>       <%= flash[:meserr] %>     </div>     <div class="field">       <%= f.label :nom_court %><br>       <%= f.text_field :autabr %>     </div>     <div class="commandes">       <%= f.submit "valider", class: "commandes_liens"%>        <%=link_to "abandonner", lister_les_auteurs_path, class: "commandes_liens" %>     </div>     <% end %>

use this:

<%= error_messages_for :auteur %>

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