app/views/users/_form.html.erb
<%= form_for @user, html: { class: 'form-horizontal' } do |f| %>
<fieldset>
<legend>
<h1><%= title -%></h1>
</legend>
<% if @user.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>
<ul>
<% @user.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="form-group">
<%= f.label :name, 'Navn', class: 'col-lg-2 control-label' %>
<div class="col-lg-10">
<%= f.text_field :name, class: 'form-control' %>
</div>
</div>
<div class="form-group">
<%= f.label :room, 'Værelse', class: 'col-lg-2 control-label' %>
<div class="col-lg-10">
<%= f.text_field :room, class: 'form-control' %>
</div>
</div>
<div class="form-group">
<div class="col-lg-offset-2 col-lg-10">
<div class="checkbox">
<label>
<%= f.check_box :visible %> Synlig
</label>
</div>
</div>
</div>
<div class="form-group">
<div class="col-lg-offset-2 col-lg-10">
<%= f.submit title, class: 'btn btn-success btn-sm' %>
<%= link_to 'Tilbage', users_path, class: 'btn btn-link btn-sm' %>
</div>
</div>
</fieldset>
<% end %>