Merge pull request #3116 from cds-astro/fix-xmatch-two-local-files

[XMatch] fix: upload of two local tables is now possible

CHANGES.rst

@@ -217,6 +217,12 @@ mpc
 - Rename ``MPC.get_mpc_object_endpoint`` to ``MPC._get_mpc_object_endpoint`` to
   indicate that it is a private method. [#3089]
 
+xmatch
+^^^^^^
+
+- Fix xmatch query for two local tables. The second table was written over the first one,
+  resulting in a confusing "missing cat1" error. [#3116]
+
 
 0.4.7 (2024-03-08)
 ==================

astroquery/xmatch/core.py

@@ -42,7 +42,7 @@ def query(self, cat1, cat2, max_distance, *,
             If the table is uploaded or accessed through a URL, it must be
             in VOTable or CSV format with the positions in J2000
             equatorial frame and as decimal degrees numbers.
-        cat2 : str or file
+        cat2 : str, file or `~astropy.table.Table`
             Identifier of the second table. Follows the same rules as *cat1*.
         max_distance : `~astropy.units.Quantity`
             Maximum distance to look for counterparts.
@@ -127,17 +127,22 @@ def _prepare_sending_table(self, cat_index, payload, kwargs, cat, colRA, colDec)
         catstr = 'cat{0}'.format(cat_index)
         if isinstance(cat, str):
             payload[catstr] = cat
-        elif isinstance(cat, Table):
-            # write the Table's content into a new, temporary CSV-file
-            # so that it can be pointed to via the `files` option
-            # file will be closed when garbage-collected
-            fp = StringIO()
-            cat.write(fp, format='ascii.csv')
-            fp.seek(0)
-            kwargs['files'] = {catstr: ('cat1.csv', fp.read())}
         else:
-            # assume it's a file-like object, support duck-typing
-            kwargs['files'] = {catstr: ('cat1.csv', cat.read())}
+            # create the dictionary of uploaded files
+            if "files" not in kwargs:
+                kwargs["files"] = {}
+            if isinstance(cat, Table):
+                # write the Table's content into a new, temporary CSV-file
+                # so that it can be pointed to via the `files` option
+                # file will be closed when garbage-collected
+
+                fp = StringIO()
+                cat.write(fp, format='ascii.csv')
+                fp.seek(0)
+                kwargs['files'].update({catstr: (f'cat{cat_index}.csv', fp.read())})
+            else:
+                # assume it's a file-like object, support duck-typing
+                kwargs['files'].update({catstr: (f'cat{cat_index}.csv', cat.read())})
 
         if not self.is_table_available(cat):
             if ((colRA is None) or (colDec is None)):

astroquery/xmatch/tests/test_xmatch.py

@@ -104,3 +104,13 @@ def test_xmatch_query_cat1_table_local(monkeypatch):
         'errHalfMaj', 'errHalfMin', 'errPosAng', 'Jmag', 'Hmag', 'Kmag',
         'e_Jmag', 'e_Hmag', 'e_Kmag', 'Qfl', 'Rfl', 'X', 'MeasureJD']
     assert len(table) == 11
+
+
+def test_two_local_tables():
+    table1 = Table({'a': [1], 'b': [1], 'c': [1]})
+    table2 = Table({'a': [1], 'b': [1], 'c': [1]})
+    payload = XMatch().query(cat1=table1, cat2=table2,
+                             colRA1="a", colDec1="b", colRA2="a", colDec2="b",
+                             max_distance=1 * arcsec,
+                             get_query_payload=True)
+    assert 'cat1' in payload[1]["files"] and 'cat2' in payload[1]["files"]