# find all submissions made by the current user, group by the
# submission's :contest_year and :organization_id attributes:

<% current_user.submissions.group([:contest_year, :organization_id]).each do |contest| %>
  <h2><%= contest.contest_year %>: <%= contest.organization.name %></h2>

# here is where it fails, it is finding all the submissions made by the user
# instead of just the submissions that belong under the
# specified contest_year/organization_id heading from above.
# I know I need 'contest' involved in here

  <% current_user.submissions.in_groups_of(3, false).each do |group| %>
    <div class="row">
    <% group.each do |submission| %>
      <div class="col-md-4">
        # submission information here
      </div>
    <% end %>
  </div><br/>
  <% end %>
<% end %>

Submission.rb

  belongs_to :user
  belongs_to :organization

submissions_controller.rb

  def index
    @submissions = Submission.all
  end