Merge pull request #31 from nhemsley/master

add eql? and hash methods to table object for using objects as hash keys

Author: sirupsen

lib/airrecord/table.rb

@@ -215,19 +215,25 @@ def serializable_fields(fields = self.fields)
           value = [ value ] unless value.is_a?(Enumerable)
           assocs = value.map { |assoc|
             assoc.respond_to?(:id) ? assoc.id : assoc
-          }               
+          }
           [key, assocs]
         else
           [key, value]
         end
         }]
     end
-    
+
     def ==(other)
       self.class == other.class &&
         serializable_fields == other.serializable_fields
     end
 
+    alias_method :eql?, :==
+
+    def hash
+      serializable_fields.hash
+    end
+
     protected
 
     def association(key)

test/table_test.rb

@@ -304,7 +304,7 @@ def test_comparison_different_classes
   end
 
   def test_association_accepts_non_enumerable
-    walrus = Walrus.new("Name" => "Wally")    
+    walrus = Walrus.new("Name" => "Wally")
     foot = Foot.new("Name" => "FrontRight", "walrus" => walrus)
 
     foot.serializable_fields
@@ -315,4 +315,32 @@ def test_dont_update_if_equal
     walrus["Name"] = "Wally"
     assert walrus.updated_keys.empty?
   end
+
+  def test_equivalent_records_are_eql?
+    walrus1 = Walrus.new("Name" => "Wally")
+    walrus2 = Walrus.new("Name" => "Wally")
+
+    assert walrus1.eql? walrus2
+  end
+
+  def test_non_equivalent_records_fail_eql?
+    walrus1 = Walrus.new("Name" => "Wally")
+    walrus2 = Walrus.new("Name" => "Wally2")
+
+    assert !walrus1.eql?(walrus2)
+  end
+
+  def test_equivalent_hash_equality
+    walrus1 = Walrus.new("Name" => "Wally")
+    walrus2 = Walrus.new("Name" => "Wally")
+
+    assert_equal walrus1.hash, walrus2.hash
+  end
+
+  def test_non_equivalent_hash_inequality
+    walrus1 = Walrus.new("Name" => "Wally")
+    walrus2 = Walrus.new("Name" => "Wally2")
+
+    assert walrus1.hash != walrus2.hash
+  end
 end