Merge pull request #877 from rinmu/master

RUBY-1223 Ignore lastWrite when comparing server descriptions

Author: estolfo

lib/mongo/server/description.rb

@@ -157,7 +157,7 @@ class Description
       # Fields to exclude when comparing two descriptions.
       #
       # @since 2.0.6
-      EXCLUDE_FOR_COMPARISON = [ LOCAL_TIME ].freeze
+      EXCLUDE_FOR_COMPARISON = [ LOCAL_TIME, LAST_WRITE ].freeze
 
       # @return [ Address ] address The server's address.
       attr_reader :address

spec/mongo/server/description_spec.rb

@@ -23,6 +23,7 @@
       'maxWireVersion' => 2,
       'minWireVersion' => 0,
       'localTime' => Time.now,
+      'lastWrite' => { 'lastWriteDate' => Time.now },
       'ok' => 1
     }
   end
@@ -838,7 +839,10 @@
     end
 
     let(:other) do
-      described_class.new(address, replica.merge('localTime' => 1))
+      described_class.new(address, replica.merge(
+        'localTime' => 1,
+        'lastWrite' => { 'lastWriteDate' => 1 }
+      ))
     end
 
     it 'excludes certain fields' do