Ticket #4427: group_by_array.patch

activesupport/lib/active_support/core_ext/enumerable.rb

@@ -22 +22 @@
-  #   "2006-02-25 -> Transcript"
-  #   "2006-02-24 -> Transcript, Transcript"
-  #   "2006-02-23 -> Transcript"
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-end

activesupport/test/core_ext/enumerable_test.rb

@@ -26 +26 @@
-    objects.group_by {|object| object.name}.each do |name, group|
-      assert group.all? {|person| person.name == name}
-    end
+  end
+  
+  def test_group_by_array
+    Event = Struct.new(:title, :occurs_on)
+    events = [ 
+     Event.new("Cooking",["Mon","Tue"]),
+     Event.new("Skiing","Mon"),
+     Event.new("Surfing",["Tue","Wed","Thu"]),
+     Event.new("Knitting",nil), # doesn't occur
+     Event.new("Knitting 2","") # doesn't occur either
+    ]
+    
+    events.group_by { |event| event.occurs_on }.each do |day, events|
+      assert events.all? {|event| event.occurs_on == day || event.occurs_on.include?(day) }
+    end
-  end
-end