Legacy implementations of a few direct methods

src/calibre/db/legacy.py

@@ -58,6 +58,9 @@ class LibraryDatabase(object):
             setattr(self, prop, partial(self.get_property,
                     loc=self.FIELD_MAP[fm]))
 
+        for meth in ('get_next_series_num_for', 'has_book', 'author_sort_from_authors'):
+            setattr(self, meth, getattr(self.new_api, meth))
+
         self.last_update_check = self.last_modified()
 
     def close(self):

src/calibre/db/tests/legacy.py

@@ -103,6 +103,22 @@ class LegacyTest(BaseTest):
 
     # }}}
 
+    def test_legacy_direct(self):  # {{{
+        'Test methods that are directly equivalent in the old and new interface'
+        from calibre.ebooks.metadata.book.base import Metadata
+        ndb = self.init_legacy()
+        db = self.init_old()
+        for meth, args in {
+            'get_next_series_num_for': [('A Series One',)],
+            'author_sort_from_authors': [(['Author One', 'Author Two', 'Unknown'],)],
+            'has_book':[(Metadata('title one'),), (Metadata('xxxx1111'),)],
+        }.iteritems():
+            for a in args:
+                self.assertEqual(getattr(db, meth)(*a), getattr(ndb, meth)(*a),
+                                 'The method: %s() returned different results for argument %s' % (meth, a))
+        db.close()
+        # }}}
+
     def test_legacy_coverage(self):  # {{{
         ' Check that the emulation of the legacy interface is (almost) total '
         cl = self.cloned_library