app/views/student_comments/_form.html.erb
<% if @student_comment.errors.any? %>
<div id="error_explanation">
<h2>
<%= pluralize(@student_comment.errors.count, "error") %> prohibited
this student from being saved:
</h2>
<ul>
<% @student_comment.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<form role="form">
<div class="row">
<%= f.hidden_field :student_id, value: @student.id %>
<div class="col-md-12">
<%= f.input :content, required: false, as: :text %>
</div>
</div>
<%= f.button :submit %>
</form>