Add new view to display assignment on this project

app/controllers/assigns_controller.rb

 class AssignsController < ApplicationController
   #layout 'admin'
+
+  # put all feature switches here
+  FEATURE_SWITCH_ALREADY_ASSIGNED_VIEW = 1
+
   before_action :find_project_by_project_id
   include SPAssignmentManager
 
@@ -62,7 +66,7 @@ class AssignsController < ApplicationController
         @assignables = ServicePack.availables
         if @assignables.exists?
           @assignment = Assign.new
-          render -'not_assigned_yet' and return
+          render (defined?(FEATURE_SWITCH_ALREADY_ASSIGNED_VIEW) ? -'already_assigned' : -'not_assigned_yet') and return
         end
       end
       render -'unassignable'

app/views/assigns/_assignment_table.html.erb

+<%# service_pack, assign, unassign, rem, total %>
+<%# link to report %>
+
+<div class="generic-table--container">
+  <div class="generic-table--results-container">
+    <table class="generic-table">
+      <colgroup>
+        <col highlight-col><col highlight-col><col highlight-col><col highlight-col><col>
+      </colgroup>
+      <thead>
+        <tr>
+          <% [-'Service Pack', -'Assign Date', -'Expiration Date', -'Units'].each do |column_name| %>
+            <th><div class="generic-table--sort-header-outer"><div class="generic-table--sort-header"><span><%= column_name %></span></div></div></th>
+          <% end %>
+          <th><div class="generic-table--empty-header"></div></th>
+        </tr>
+      </thead>
+      <tbody>
+        <tr>
+          <%= content_tag :td, @assignment.service_pack.name %>
+          <%= content_tag :td, @assignment.assign_date %>
+          <%= content_tag :td, @assignment.unassign_date %>
+          <%= content_tag :td, "#{@assignment.service_pack.remained_units}/#{@assignment.service_pack.total_units}" %>
+          <%= content_tag :td, op_icon(-'icon icon-delete') %>
+        </tr>
+      </tbody>
+    </table>
+  </div>
+</div>
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app/views/assigns/already_assigned.html.erb

-<%= stylesheet_link_tag 'assigns', plugin: :openproject_service_packs %>
-
-<div id="sp-display">
-  <h2>Service Pack <%= @service_pack.name %> already assigned to <%= @project.name %></h2><hr/>
-  <strong>Assignment Date</strong>: <%= @assignment.assign_date %>
-  <strong>Valid Until</strong>: <%= @assignment.unassign_date %>
-  <strong>Remained:</strong> <%= @service_pack.remained_units %>/<%= @service_pack.total_units %>
-</div>
-<br/>
-<% if @can_unassign ||= User.current.allowed_to?(:unassign_service_packs, @project) %>
-  <%= link_to -'Unassign', assigns_unassign_path(@project), method: :post, class: -'button norm', data: { confirm: -'Are you sure?' }%>
-<% end %>
-<hr/>
-<p class='other-formats'>Report available in: <%= link_to -'CSV', {action: :report, format: :csv} %></p>
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+<h2>Assigned Service Packs</h2>
+<a class="button -alt-highlight float-right" href="#">
+  <i class="button--icon icon-add" aria-hidden="true"></i><span class="button--text">Assign</span>
+</a>
+<% if @assignment.new_record? %>
+  <div id="result-table">
+    <div class="generic-table--no-results-container">
+      <i class="icon-info1"></i>
+      <h3 class="generic-table--no-results-title">No Service Pack is assigned to this project.</h3>
+    </div>
+  </div>
+<% else %>
+  <%= render partial: -'assignment_table' %>
+<% end %>
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