app/views/activity_categories/_form.html.erb
<%= form_for(activity_category) do |f| %>
<%= render 'shared/errors', subject: activity_category, subject_name: 'activity category' %>
<div class="form-group">
<%= f.label :name %>
<%= f.text_field :name, class: 'form-control' %>
</div>
<div class="form-group">
<%= f.label :description %>
<%= f.text_field :description, class: 'form-control' %>
</div>
<div class="actions">
<%= f.submit class: 'btn btn-primary' %>
</div>
<% end %>