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    copied!<p>OK, I found the issue. The issue was coming from my partial form view which I use for my 'edit' action and for my 'new' action : /app/views/admin/admin_utilisateurs/_form.html.haml</p> <pre><code>= form_for @admin_utilisateur, :url =&gt; admin_admin_utilisateur_path, :html =&gt; {:class =&gt; "formulaire-standard"} do |f| = render :partial =&gt; 'shared/error_message', :locals =&gt; { :element =&gt; @admin_utilisateur, :debut_erreur =&gt; 'Cet utilisateur ne peut être enregistré'} .groupe-champs .champ = f.label :nom = f.text_field :nom, :class =&gt; 'input-width-8-col', :required =&gt; 'required' .champ = f.label :prenom = f.text_field :prenom, :class =&gt; 'input-width-5-col', :required =&gt; 'required' .champ = f.label :telephone = f.telephone_field :telephone, :class =&gt; 'input-width-5-col', :required =&gt; 'required' .champ = f.label :mobile = f.telephone_field :mobile, :class =&gt; 'input-width-5-col' .champ = f.label :email = f.email_field :email, :class =&gt; 'input-width-8-col', :required =&gt; 'required' .groupe-champs = render :partial =&gt; 'shared/checkboxes_admin_utilisateur', :locals =&gt; { :resource =&gt; @admin_utilisateur } .groupe-champs .champ-1 = f.check_box :approved .champ-5 = f.label :approved .checkbox-explication = t('activerecord.attributes.admin_utilisateur.explanations.active') .separator .groupe-actions = f.submit 'Enregistrer', :class =&gt; 'btn-text btn-dimensions btn-encrusted metal' = link_to 'Annuler', admin_admin_utilisateur_path, :class =&gt; 'btn-text btn-dimensions btn-encrusted metal' </code></pre> <p>I was using the form_for tag incorrectly. Because my form is used within a namespace, I must add the namespace into its arguments, and remove the :url option because otherwise this form will only work with the 'edit' action :</p> <pre><code>= form_for [:admin, @admin_utilisateur], :html =&gt; {:class =&gt; "formulaire-standard"} do |f| </code></pre> <p>This code lets Rails guess what path to use wether it's for a new record or to edit an existing record. So I don't need to specify the :url and the :method.</p> <p>The second mistake was (a classical one) the link_to at the bottom of the form. I forgot the 's' at the end of the route helper (admin_admin_utilisateurSSSS_path):</p> <pre><code>= link_to 'Annuler', admin_admin_utilisateurs_path, :class =&gt; 'btn-text btn-dimensions btn-encrusted metal' </code></pre> <h1>The moral of the story :</h1> <p><strong>ALLWAYS CHECK YOUR /log/development.log FILE !</strong> ;-)</p>
 

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