Merge branch 'GH3189'

* GH3189:
  BUG: DataFrame.to_records(index=True) doesn't work with MultiIndex GH3189
  TST: DataFrame.to_records(index=True) doesn't work with MultiIndex GH3189

Author: y-p

pandas/core/frame.py

@@ -1100,8 +1100,13 @@ def to_records(self, index=True, convert_datetime64=True):
             if com.is_datetime64_dtype(self.index) and convert_datetime64:
                 ix_vals = [self.index.to_pydatetime()]
             else:
-                ix_vals = [self.index.values]
-            arrays = ix_vals + [self[c].values for c in self.columns]
+                if isinstance(self.index, MultiIndex):
+                    # array of tuples to numpy cols. copy copy copy
+                    ix_vals = map(np.array,zip(*self.index.values))
+                else:
+                    ix_vals = [self.index.values]
+
+            arrays = ix_vals+ [self[c].values for c in self.columns]
 
             count = 0
             index_names = self.index.names

pandas/tests/test_frame.py

@@ -3303,6 +3303,16 @@ def test_to_records_dt64(self):
         rs = df.to_records(convert_datetime64=False)
         self.assert_(rs['index'][0] == df.index.values[0])
 
+    def test_to_records_with_multindex(self):
+        # GH3189
+        index = [['bar', 'bar', 'baz', 'baz', 'foo', 'foo', 'qux', 'qux'],
+                 ['one', 'two', 'one', 'two', 'one', 'two', 'one', 'two']]
+        data = np.zeros((8, 4))
+        df = DataFrame(data, index=index)
+        r = df.to_records(index=True)['level_0']
+        self.assertTrue('bar' in r)
+        self.assertTrue('one' not in r)
+
     def test_to_records_with_Mapping_type(self):
         import email
         from email.parser import Parser