#73 copy with except

lib/fbe/copy.rb

@@ -29,11 +29,14 @@
 #
 # @param [Factbase::Fact] source The source
 # @param [Factbase::Fact] target The targer
-def Fbe.copy(source, target)
+# @param [Array<String>] except List of properties to NOT copy
+def Fbe.copy(source, target, except: [])
   raise 'The source is nil' if source.nil?
   raise 'The target is nil' if target.nil?
+  raise 'The except is nil' if except.nil?
   source.all_properties.each do |k|
     next unless target[k].nil?
+    next if except.include?(k)
     source[k].each do |v|
       target.send(:"#{k}=", v)
     end

test/fbe/test_copy.rb

@@ -43,4 +43,15 @@ def test_simple_copy
     assert_equal(2, f2._id)
     assert_equal(42, f2.foo)
   end
+
+  def test_with_except
+    fb = Factbase.new
+    f1 = fb.insert
+    f1._id = 1
+    f1.foo = 42
+    f2 = fb.insert
+    f2._id = 2
+    Fbe.copy(f1, f2, except: ['foo'])
+    assert(f2['foo'].nil?)
+  end
 end