<% define_content :link do -%>
  <%= polymorphic_url([asset.submission.assignment.context, asset.submission.assignment, :submission], id: asset.submission.user) %>
<% end -%>
<%= t :tweet, "Canvas Alert - Comment: %{author} for %{assignment}, %{user}, %{context}.",
        :author => submission_comment_author(asset, user),
        :assignment => asset.submission.assignment.title,
        :user => submission_comment_submittor(asset, user),
        :context => asset.submission.assignment.context.name %>