Fix inconsistencies with Time{WithZone}#{hash,eql?}

Author: marcandre

activesupport/lib/active_support/core_ext/time/calculations.rb

@@ -312,4 +312,14 @@ def compare_with_coercion(other)
   end
   alias_method :compare_without_coercion, :<=>
   alias_method :<=>, :compare_with_coercion
+
+  # Layers additional behavior on Time#eql? so that ActiveSupport::TimeWithZone instances
+  # can be eql? to an equivalent Time
+  def eql_with_coercion(other)
+    # if other is an ActiveSupport::TimeWithZone, coerce a Time instance from it so we can do eql? comparison
+    other = other.comparable_time if other.respond_to?(:comparable_time)
+    eql_without_coercion(other)
+  end
+  alias_method :eql_without_coercion, :eql?
+  alias_method :eql?, :eql_with_coercion
 end

activesupport/lib/active_support/time_with_zone.rb

@@ -203,7 +203,11 @@ def future?
     end
 
     def eql?(other)
-      utc == other
+      utc.eql?(other)
+    end
+
+    def hash
+      utc.hash
     end
 
     def +(other)
@@ -277,7 +281,6 @@ def to_f
     def to_i
       utc.to_i
     end
-    alias_method :hash, :to_i
     alias_method :tv_sec, :to_i
 
     # A TimeWithZone acts like a Time, so just return +self+.

activesupport/test/core_ext/time_ext_test.rb

@@ -744,6 +744,12 @@ def test_compare_with_time_with_zone
     assert_equal(-1, Time.utc(2000) <=> ActiveSupport::TimeWithZone.new( Time.utc(2000, 1, 1, 0, 0, 1), ActiveSupport::TimeZone['UTC'] ))
   end
 
+  def test_eql?
+    assert_equal true, Time.utc(2000).eql?( ActiveSupport::TimeWithZone.new(Time.utc(2000), ActiveSupport::TimeZone['UTC']) )
+    assert_equal true, Time.utc(2000).eql?( ActiveSupport::TimeWithZone.new(Time.utc(2000), ActiveSupport::TimeZone["Hawaii"]) )
+    assert_equal false,Time.utc(2000, 1, 1, 0, 0, 1).eql?( ActiveSupport::TimeWithZone.new(Time.utc(2000), ActiveSupport::TimeZone['UTC']) )
+  end
+
   def test_minus_with_time_with_zone
     assert_equal  86_400.0, Time.utc(2000, 1, 2) - ActiveSupport::TimeWithZone.new( Time.utc(2000, 1, 1), ActiveSupport::TimeZone['UTC'] )
   end

activesupport/test/core_ext/time_with_zone_test.rb

@@ -200,8 +200,15 @@ def future_with_time_current_as_time_with_zone
   end
 
   def test_eql?
-    assert @twz.eql?(Time.utc(2000))
-    assert @twz.eql?( ActiveSupport::TimeWithZone.new(Time.utc(2000), ActiveSupport::TimeZone["Hawaii"]) )
+    assert_equal true, @twz.eql?(Time.utc(2000))
+    assert_equal true, @twz.eql?( ActiveSupport::TimeWithZone.new(Time.utc(2000), ActiveSupport::TimeZone["Hawaii"]) )
+    assert_equal false, @twz.eql?( Time.utc(2000, 1, 1, 0, 0, 1) )
+    assert_equal false, @twz.eql?( DateTime.civil(1999, 12, 31, 23, 59, 59) )
+  end
+
+  def test_hash
+    assert_equal Time.utc(2000).hash, @twz.hash
+    assert_equal Time.utc(2000).hash, ActiveSupport::TimeWithZone.new(Time.utc(2000), ActiveSupport::TimeZone["Hawaii"]).hash
   end
 
   def test_plus_with_integer