Add Mongoid support

ipaddress.gemspec

@@ -32,9 +32,11 @@ Gem::Specification.new do |s|
     "lib/ipaddress/ipv4.rb",
     "lib/ipaddress/ipv6.rb",
     "lib/ipaddress/prefix.rb",
+    "lib/ipaddress/mongoid.rb",
     "test/ipaddress/ipv4_test.rb",
     "test/ipaddress/ipv6_test.rb",
     "test/ipaddress/prefix_test.rb",
+    "test/ipaddress/mongoid_test.rb",
     "test/ipaddress_test.rb",
     "test/test_helper.rb"
   ]

lib/ipaddress.rb

@@ -14,6 +14,7 @@
 
 require 'ipaddress/ipv4'
 require 'ipaddress/ipv6'
+require 'ipaddress/mongoid' if defined?(Mongoid)
 
 module IPAddress
 

lib/ipaddress/mongoid.rb

+module IPAddress
+
+  #
+  # Mongoid field serialization
+  #
+  # IPAddress objects are converted to String
+  #
+  #   IPAddress.mongoize IPAddress.parse("172.16.10.1")
+  #     #=> "172.16.10.1"
+  #
+  # Prefix will be removed from host adresses
+  #
+  #   IPAddress.mongoize "172.16.10.1/32"
+  #     #=> "172.16.10.1"
+  #
+  # Prefix will be kept for network addresses
+  #
+  #   IPAddress.mongoize "172.16.10.1/24"
+  #     #=> "172.16.10.1/24"
+  #
+  # IPv6 addresses will be stored uncompressed to ease DB search and sorting
+  #
+  #   IPAddress.mongoize "2001:db8::8:800:200c:417a"
+  #     #=> "2001:0db8:0000:0000:0008:0800:200c:417a"
+  #   IPAddress.mongoize "2001:db8::8:800:200c:417a/64"
+  #     #=> "2001:0db8:0000:0000:0008:0800:200c:417a/64"
+  #
+  # Invalid addresses will be serialized as nil
+  #
+  #   IPAddress.mongoize "invalid"
+  #     #=> nil
+  #   IPAddress.mongoize ""
+  #     #=> nil
+  #   IPAddress.mongoize 1
+  #     #=> nil
+  #   IPAddress.mongoize nil
+  #     #=> nil
+  #
+  def self.mongoize(ipaddress)
+    ipaddress = self.parse(ipaddress) unless ipaddress.is_a?(IPAddress)
+    if ipaddress.bits.length == ipaddress.prefix
+      ipaddress.address
+    elsif ipaddress.is_a?(IPAddress::IPv6)
+      ipaddress.to_string_uncompressed
+    else
+      ipaddress.to_string
+    end
+  rescue ArgumentError
+    nil
+  end
+
+  #
+  # Mongoid field deserialization
+  #
+  def self.demongoize(string)
+    parse(string)
+  rescue ArgumentError
+    nil
+  end
+
+  #
+  # Delegates to IPAddress.mongoize
+  #
+  def self.evolve(ipaddress)
+    mongoize(ipaddress)
+  end
+
+  #
+  # Sends self object to IPAddress#mongoize
+  #
+  def mongoize
+    IPAddress.mongoize(self)
+  end
+
+end
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test/ipaddress/mongoid_test.rb

+require 'test_helper'
+require 'ipaddress/mongoid'
+ 
+class MongoidTest < Test::Unit::TestCase
+
+  def setup
+    @valid_host4               = "172.16.10.1"
+    @valid_host6               = "2001:0db8:0000:0000:0008:0800:200c:417a"
+    @valid_host6_compressed    = IPAddress::IPv6.compress(@valid_host6)
+    @valid_network4            = "#{@valid_host4}/24"
+    @valid_network6            = "#{@valid_host6}/96"
+    @valid_network6_compressed = "#{@valid_host6_compressed}/96"
+    @host4                     = IPAddress.parse(@valid_host4)
+    @host6                     = IPAddress.parse(@valid_host6)
+    @network4                  = IPAddress.parse(@valid_network4)
+    @network6                  = IPAddress.parse(@valid_network6)
+    @invalid_values            = [nil, "", 1, "invalid"]
+  end
+
+  def test_mongoize
+    # Instance method should be delegated to class method
+    assert_equal @host4.mongoize,    IPAddress.mongoize(@host4)
+    assert_equal @network4.mongoize, IPAddress.mongoize(@network4)
+
+    # Hosts addresses should be stored without prefix
+    assert_equal @valid_host4, IPAddress.mongoize(@host4)
+    assert_equal @valid_host6, IPAddress.mongoize(@host6)
+    assert_equal @valid_host4, IPAddress.mongoize("#{@host4}/32")
+    assert_equal @valid_host6, IPAddress.mongoize("#{@host6}/128")
+
+    # Network addresses should be stored with their prefix
+    assert_equal @valid_network4, IPAddress.mongoize(@network4)
+    assert_equal @valid_network6, IPAddress.mongoize(@network6)
+
+    # IPv6 addresses should always be stored uncompressed
+    assert_equal @valid_host6,    IPAddress.mongoize(@valid_host6_compressed)
+    assert_equal @valid_network6, IPAddress.mongoize(@valid_network6_compressed)
+
+    @invalid_values.each do |invalid_value|
+      # Invalid address should not raise error
+      assert_nothing_raised {IPAddress.mongoize(invalid_value)}
+      
+      # Invalid addresses should serialize to nil
+      assert_equal nil, IPAddress.mongoize(invalid_value)
+    end
+  end
+
+  def test_demongoize
+    # Valid stored values should be loaded with expected IPAddress type
+    assert_instance_of IPAddress::IPv4, IPAddress.demongoize(@valid_host4)
+    assert_instance_of IPAddress::IPv6, IPAddress.demongoize(@valid_host6)
+    assert_instance_of IPAddress::IPv4, IPAddress.demongoize(@valid_network4)
+    assert_instance_of IPAddress::IPv6, IPAddress.demongoize(@valid_network6)
+
+    # Valid stored values should be loaded as the original IPAddress object
+    assert_equal @host4,    IPAddress.demongoize(@valid_host4)
+    assert_equal @host6,    IPAddress.demongoize(@valid_host6)
+    assert_equal @network4, IPAddress.demongoize(@valid_network4)
+    assert_equal @network6, IPAddress.demongoize(@valid_network6)
+
+    @invalid_values.each do |invalid_value|
+      # Invalid stored values should not raise error
+      assert_nothing_raised {IPAddress.demongoize(invalid_value)}
+
+      # Invalid stored value should be loaded as nil
+      assert_equal nil, IPAddress.demongoize(invalid_value)
+    end
+  end
+
+  def test_evolve
+    # evolve should delegate to mongoize
+    assert_equal IPAddress.mongoize(@valid_host4),    IPAddress.evolve(@valid_host4)
+    assert_equal IPAddress.mongoize(@valid_network4), IPAddress.evolve(@valid_network4)
+  end
+
+end
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