ruby hash comparison starts with comparing hash values

mongomapper · Apr 24, 2013 · 208c7c9 · 208c7c9
1 parent 6fd55a6
commit 208c7c9
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Showing 2 changed files with 13 additions and 1 deletion.
diff --git a/lib/plucky/extensions/symbol.rb b/lib/plucky/extensions/symbol.rb
@@ -73,6 +73,10 @@ def <=>(other)
       field.to_s <=> other.field.to_s
     end
   end
+
+  def hash
+    field.hash + operator.hash
+  end
 
   def ==(other)
     other.class == self.class && field == other.field && operator == other.operator

diff --git a/spec/symbol_operator_spec.rb b/spec/symbol_operator_spec.rb
@@ -34,7 +34,15 @@
         SymbolOperator.new(:foo, 'in').should_not == 'foo.in'
       end
     end
-
+
+    context "hash" do
+
+      it 'returns sum of operator and hash field' do
+        SymbolOperator.new(:foo, 'in').hash.should == :foo.hash + 'in'.hash
+      end
+
+    end
+
     context "<=>" do
       it "returns string comparison of operator for same field, different operator" do
         (SymbolOperator.new(:foo, 'in') <=> SymbolOperator.new(:foo, 'all')).should ==  1