app/views/observation_matrix_columns/show.html.erb
<%= content_for :associated do -%>
<h3> Observations </h3>
<ul>
<% @observation_matrix_column.observations.each do |o| -%>
<%= content_tag(:li, observation_tag(o)) %>
<% end %>
</ul>
<% end %>
<%= render(partial: 'shared/data/project/show', locals: {object: @observation_matrix_column}) -%>