app/views/tours/edit.html.erb
<div class="text-center">
<h1 class="h3 mb-0 font-weight-bold">Tour bearbeiten</h1>
</div>
<div class="row justify-content-center">
<div class="col-lg-8">
<%= form_with( url: tour_path(@tour.id), method: :patch, local: true) do %>
<%= render partial: "tours/form", locals: { tour: @tour } %>
<% end %>
</div>
</div>