Fixes for postgresql inet columns in Rails 4. They're backed by an IPAddr class now, which breaks sql parameter marker support, and automatically sets the attribute to nil when trying to assign an invalid ip address.

Gemfile_rails4.lock

@@ -23,7 +23,7 @@ GIT
 
 GIT
   remote: git://github.com/rails/rails.git
-  revision: 0785008a64f4af8d09379683303d49d160cd444d
+  revision: 81432139a9ca5bf90f08273d88e6e4f583c4189b
   branch: 4-0-stable
   specs:
     actionmailer (4.0.0)
@@ -434,7 +434,7 @@ GEM
       multi_json (~> 1.0)
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)
-    sprockets-rails (2.0.0)
+    sprockets-rails (2.0.1)
       actionpack (>= 3.0)
       activesupport (>= 3.0)
       sprockets (~> 2.8)

app/models/screened_ip_address.rb

@@ -21,7 +21,7 @@ class ScreenedIpAddress < ActiveRecord::Base
     #
     #   http://www.postgresql.org/docs/9.1/static/datatype-net-types.html
     #   http://www.postgresql.org/docs/9.1/static/functions-net.html
-    where('? <<= ip_address', ip_address).first
+    where("'#{ip_address.to_s}' <<= ip_address").first
   end
 
   def self.should_block?(ip_address)

app/services/staff_action_logger.rb

@@ -11,7 +11,7 @@ class StaffActionLogger
       action: UserHistory.actions[:delete_user],
       target_user_id: deleted_user.id,
       email: deleted_user.email,
-      ip_address: deleted_user.ip_address,
+      ip_address: deleted_user.ip_address.to_s,
       details: [:id, :username, :name, :created_at, :trust_level, :last_seen_at, :last_emailed_at].map { |x| "#{x}: #{deleted_user.send(x)}" }.join(', ')
     }))
   end

lib/validators/ip_address_format_validator.rb

@@ -3,9 +3,17 @@
 class IpAddressFormatValidator < ActiveModel::EachValidator
 
   def validate_each(record, attribute, value)
-    unless record.ip_address.nil? or record.ip_address.split('/').first =~ Resolv::AddressRegex
+    if rails4?
+      # In Rails 4, ip_address will be nil if an invalid IP address was assigned.
+      # https://github.com/jetthoughts/rails/commit/0aa95a71b04f2893921c58a7c1d9fca60dbdcbc2
+      if record.ip_address.nil?
         record.errors.add(attribute, :invalid)
       end
+    else
+      unless !record.ip_address.nil? and record.ip_address.to_s.split('/').first =~ Resolv::AddressRegex
+        record.errors.add(attribute, :invalid)
+      end
+    end
   end
 
 end

spec/components/validators/ip_address_format_validator_spec.rb

@@ -6,7 +6,7 @@ describe IpAddressFormatValidator do
   let(:validator) { described_class.new({attributes: :ip_address}) }
   subject(:validate) { validator.validate_each(record, :ip_address, record.ip_address) }
 
-  [nil, '99.232.23.123', '99.232.0.0/16', 'fd12:db8::ff00:42:8329', 'fc00::/7'].each do |arg|
+  ['99.232.23.123', '99.232.0.0/16', 'fd12:db8::ff00:42:8329', 'fc00::/7'].each do |arg|
     it "should not add an error for #{arg}" do
       record.ip_address = arg
       validate
@@ -14,6 +14,12 @@ describe IpAddressFormatValidator do
     end
   end
 
+  it 'should add an error for nil IP address' do
+    record.ip_address = nil
+    validate
+    record.errors[:ip_address].should be_present
+  end
+
   it 'should add an error for invalid IP address' do
     record.ip_address = '99.99.99'
     validate