app/views/admin/events/edit_events.html.erb
<% if current_authentication.admin? %>
<h1>Editer un événement</h1>
<%= form_for Event.to_s, method: :patch do |f| %>
<div class="field">
<%= label_tag "nom de l'événement" %><br />
<%= text_field_tag :name, nil, value: "#{@event.name}" %>
</div>
<div class="field">
<%= label_tag "Date de lancement" %><br />
<%= f.date_field :open, value: "#{@event.open}" %>
</div>
<div class="field">
<%= label_tag "Date de fin" %><br />
<%= f.date_field :close, value: "#{@event.close}" %>
</div>
<div class="field">
<%= label_tag "Date de livraison" %><br />
<%= f.date_field :delivery, value: "#{@event.delivery}" %>
</div>
<%= submit_tag 'Editer', id: 'btns', class: 'mt-3 mb-3' %>
<% end %>
<% else %>
<p>Accès refusé</p>
<% end %>
<%= link_to "Retour", admin_dashboard_path, id: 'btns' %>