<% if transaction.transaction_type == 'request' %>
  <%= link_to transaction.request.requester.first_name, user_path(request.requester) %> has made a request.
<% elsif transaction.transaction_type == 'response' %>
  <%= link_to transaction.request.responder.first_name, user_path(request.responder) %> has responded to <%= link_to transaction.request.requester.first_name, user_path(request.requester) %>'s request!
<% elsif transaction.transaction_type == 'fulfillment' %>
  <%= link_to transaction.request.responder.first_name, user_path(request.responder) %> has fulfilled <%= link_to transaction.request.requester.first_name, user_path(request.requester) %>'s request!
<% else %>
  Poop
<% end %>

<% if transaction.transaction_type == 'request' %>
  <%= link_to transaction.request.requester.first_name, user_path(transaction.request.requester) %> has made a request.
<% elsif transaction.transaction_type == 'response' %>
  <%= link_to transaction.request.responder.first_name, user_path(transaction.request.responder) %> has responded to <%= link_to transaction.request.requester.first_name, user_path(transaction.request.requester) %>'s request!
<% elsif transaction.transaction_type == 'fulfillment' %>
  <%= link_to transaction.request.responder.first_name, user_path(transaction.request.responder) %> has fulfilled <%= link_to transaction.request.requester.first_name, user_path(transaction.request.requester) %>'s request!
<% else %>
  Poop
<% end %>

Add transaction.- prepended to get proper association
Add transaction.- prepended to get proper association
