Fix bug that caused serialized FITS tables to be duplicated

CHANGES.rst

@@ -19,6 +19,9 @@
   ``tag_to_schema_resolver`` property for ``AsdfFile`` and
   ``AsdfExtensionList``. [#399]
 
+- Fix bug that caused serialized FITS tables to be duplicated in embedded ASDF
+  HDU. [#411]
+
 1.3.2 (unreleased)
 ------------------
 

asdf/fits_embed.py

@@ -95,7 +95,9 @@ def find_or_create_block_for_array(self, arr, ctx):
         if not isinstance(arr, ndarray.NDArrayType):
             base = util.get_array_base(arr)
             for hdu in self._hdulist:
-                if base is hdu.data:
+                if hdu.data is None:
+                    continue
+                if base is util.get_array_base(hdu.data):
                     return _FitsBlock(hdu)
 
         return super(

asdf/tests/test_fits_embed.py

@@ -13,6 +13,7 @@
 
 astropy = pytest.importorskip('astropy')
 from astropy.io import fits
+from astropy.table import Table
 from astropy.tests.helper import catch_warnings
 
 from .. import asdf
@@ -259,3 +260,21 @@ def test_version_mismatch_file():
         with fits_embed.AsdfInFits.open(testfile) as fits_handle:
             assert fits_handle.tree['a'] == complex(0j)
     assert len(w) == 0, display_warnings(w)
+
+def test_serialize_table(tmpdir):
+    tmpfile = str(tmpdir.join('table.fits'))
+
+    data = np.random.random((10, 10))
+    table = Table(data)
+
+    hdu = fits.BinTableHDU(table)
+    hdulist = fits.HDUList()
+    hdulist.append(hdu)
+
+    tree = {'my_table': hdulist[1].data}
+    with fits_embed.AsdfInFits(hdulist, tree) as ff:
+        ff.write_to(tmpfile)
+
+    with asdf.AsdfFile.open(tmpfile) as ff:
+        data = ff.tree['my_table']
+        assert data._source.startswith('fits:')