bugfixes, policies, errors now have a link to the submissions

app/policies/comment_policy.rb

@@ -0,0 +1,22 @@
+class CommentPolicy < ApplicationPolicy
+  def author?
+    @user == @record.author
+  end
+  private :author?
+
+  def create?
+    everyone
+  end
+
+  [:new?, :show?, :destroy?].each do |action|
+    define_method(action) { admin? || author? }
+  end
+
+  def edit?
+    admin?
+  end
+
+  def index?
+    everyone
+  end
+end