Merge pull request #34858 from albertoalmagro/make-rails-compatible-accross-ruby-versions

Make average compatible across ruby versions

activerecord/lib/active_record/relation/calculations.rb

@@ -401,7 +401,7 @@ def type_cast_calculated_value(value, type, operation = nil)
         case operation
         when "count"   then value.to_i
         when "sum"     then type.deserialize(value || 0)
-        when "average" then value.respond_to?(:to_d) ? value.to_d : value
+        when "average" then value&.respond_to?(:to_d) ? value.to_d : value
         else type.deserialize(value)
         end
       end

activerecord/test/cases/calculations_test.rb

@@ -57,12 +57,8 @@ def test_should_return_integer_average_if_db_returns_such
     assert_equal 3, value
   end
 
-  def test_should_return_nil_to_d_as_average
-    if nil.respond_to?(:to_d)
-      assert_equal BigDecimal(0), NumericData.average(:bank_balance)
-    else
-      assert_nil NumericData.average(:bank_balance)
-    end
+  def test_should_return_nil_as_average
+    assert_nil NumericData.average(:bank_balance)
   end
 
   def test_should_get_maximum_of_field