Replaces can? :flag/:unflag by a helper function

app/helpers/flags_helper.rb

@@ -0,0 +1,23 @@
+module FlagsHelper
+  def show_flag_action?(flaggable)
+    current_user && !own_flaggable?(flaggable) && !flagged?(flaggable)
+  end
+
+  def show_unflag_action?(flaggable)
+    current_user && !own_flaggable?(flaggable) && flagged?(flaggable)
+  end
+
+  private
+
+  def flagged?(flaggable)
+    Flag.flagged?(current_user, flaggable)
+  end
+
+  def own_flaggable?(flaggable)
+    if flaggable.is_a? Comment
+      flaggable.user_id == current_user.id
+    else
+      flaggable.author_id == current_user.id
+    end
+  end
+end

app/views/comments/_flag_actions.html.erb

@@ -1,4 +1,4 @@
-<% if can? :flag, comment %>
+<% if show_flag_action? comment %>
   <span class="divider">&nbsp;|&nbsp;</span>
   <a id="flag-expand-comment-<%= comment.id %>" data-dropdown="flag-drop-comment-<%= comment.id %>" aria-controls="flag-drop-comment-<%= comment.id %>" aria-expanded="false" title="<%= t('shared.flag') %>">
     &nbsp;<i class="icon-flag flag-disable"></i>&nbsp;&nbsp;
@@ -10,7 +10,7 @@
   </ul>
 <% end %>
 
-<% if can? :unflag, comment %>
+<% if show_unflag_action? comment %>
   <span class="divider">&nbsp;|&nbsp;</span>
   <a id="unflag-expand-comment-<%= comment.id %>" data-dropdown="unflag-drop-comment-<%= comment.id %>" aria-controls="unflag-drop-comment-<%= comment.id %>" aria-expanded="false" title="<%= t('shared.unflag') %>">
     &nbsp;<i class="icon-flag flag-active"></i>&nbsp;&nbsp;

app/views/debates/_flag_actions.html.erb

@@ -1,4 +1,4 @@
-<% if can? :flag, debate %>
+<% if show_flag_action? debate %>
   <a id="flag-expand-debate-<%= debate.id %>" data-dropdown="flag-drop-debate-<%= debate.id %>" aria-controls="flag-drop-debate-<%= debate.id %>" aria-expanded="false" title="<%= t('shared.flag') %>">
     &nbsp;<i class="icon-flag flag-disable"></i>&nbsp;&nbsp;
   </a>
@@ -9,7 +9,7 @@
   </ul>
 <% end %>
 
-<% if can? :unflag, debate %>
+<% if show_unflag_action? debate %>
   <a id="unflag-expand-debate-<%= debate.id %>" data-dropdown="unflag-drop-debate-<%= debate.id %>" aria-controls="unflag-drop-debate-<%= debate.id %>" aria-expanded="false" title="<%= t('shared.unflag') %>">
     &nbsp;<i class="icon-flag flag-active"></i>&nbsp;&nbsp;
   </a>