pundit: convert ip bans to pundit.

app/policies/ip_ban_policy.rb

@@ -0,0 +1,17 @@
+class IpBanPolicy < ApplicationPolicy
+  def create?
+    user.is_moderator?
+  end
+
+  def index?
+    user.is_moderator?
+  end
+
+  def destroy?
+    user.is_moderator?
+  end
+
+  def permitted_attributes
+    [:ip_addr, :reason]
+  end
+end