app/views/repositories/new.html.erb
<div class="page-header">
<h1><%= t_action(:new, Repository) %></h1>
</div>
<% unless @project_id.nil? %>
<%= form_for(@repository, :url => project_repositories_path(@project_id)) do |f| %>
<%= render partial: 'form', locals: {f: f} %>
<% end %>
<% else %>
<%= form_for(@repository, :url => repositories_path) do |f| %>
<%= render partial: 'form', locals: {f: f} %>
<% end %>
<% end %>