diff --git a/src/calibre/db/__init__.py b/src/calibre/db/__init__.py
index eded760cde..781e886567 100644
--- a/src/calibre/db/__init__.py
+++ b/src/calibre/db/__init__.py
@@ -114,4 +114,7 @@ Various things that require other things before they can be migrated:
     3. From refresh in the legacy interface: Rember to flush the composite
     column template cache.
     4. Replace the metadatabackup thread with the new implementation when using the new backend.
+    5. In the new API refresh() does not re-read from disk. That might break a
+    few things, for example content server reloading on db change as well as
+    dump/restore of db?
 '''
diff --git a/src/calibre/db/legacy.py b/src/calibre/db/legacy.py
index 6128d6a09a..83392d6d16 100644
--- a/src/calibre/db/legacy.py
+++ b/src/calibre/db/legacy.py
@@ -402,6 +402,13 @@ class LibraryDatabase(object):
     def delete_conversion_options(self, book_id, fmt, commit=True):
         self.new_api.delete_conversion_options((book_id,), fmt=fmt)
 
+    def set(self, index, field, val, allow_case_change=False):
+        book_id = self.data.index_to_id(index)
+        try:
+            return self.new_api.set_field(field, {book_id:val}, allow_case_change=allow_case_change)
+        finally:
+            self.notify('metadata', [book_id])
+
     # Private interface {{{
     def __iter__(self):
         for row in self.data.iterall():
diff --git a/src/calibre/db/tests/legacy.py b/src/calibre/db/tests/legacy.py
index 76deaea792..037f972010 100644
--- a/src/calibre/db/tests/legacy.py
+++ b/src/calibre/db/tests/legacy.py
@@ -40,6 +40,19 @@ def compare_argspecs(old, new, attr):
     if not ok:
         raise AssertionError('The argspec for %s does not match. %r != %r' % (attr, old, new))
 
+def run_funcs(self, db, ndb, funcs):
+    for func in funcs:
+        meth, args = func[0], func[1:]
+        if callable(meth):
+            meth(*args)
+        else:
+            fmt = lambda x:x
+            if meth[0] in {'!', '@', '#'}:
+                fmt = {'!':dict, '@':frozenset, '#':lambda x:set((x or '').split(','))}[meth[0]]
+                meth = meth[1:]
+            self.assertEqual(fmt(getattr(db, meth)(*args)), fmt(getattr(ndb, meth)(*args)),
+                                'The method: %s() returned different results for argument %s' % (meth, args))
+
 class LegacyTest(BaseTest):
 
     ''' Test the emulation of the legacy interface. '''
@@ -137,8 +150,9 @@ 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()
+        ndb = self.init_legacy(self.cloned_library)
         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'],)],
@@ -221,19 +235,13 @@ class LegacyTest(BaseTest):
         t = next(tmap.iterkeys())
         pmap = cache.get_id_map('publisher')
         p = next(pmap.iterkeys())
-        for x in (
+        run_funcs(self, db, ndb, (
             ('delete_tag_using_id', t),
             ('delete_publisher_using_id', p),
             (db.refresh,),
             ('all_tag_names',), ('tags', 0), ('tags', 1), ('tags', 2),
             ('all_publisher_names',), ('publisher', 0), ('publisher', 1), ('publisher', 2),
-        ):
-            meth, args = x[0], x[1:]
-            if callable(meth):
-                meth(*args)
-            else:
-                self.assertEqual((getattr(db, meth)(*args)), (getattr(ndb, meth)(*args)),
-                                 'The method: %s() returned different results for argument %s' % (meth, args))
+        ))
         db.close()
     # }}}
 
@@ -387,3 +395,24 @@ class LegacyTest(BaseTest):
         old.close()
     # }}}
 
+    def test_legacy_setters(self):  # {{{
+        'Test methods that are directly equivalent in the old and new interface'
+        ndb = self.init_legacy(self.cloned_library)
+        db = self.init_old(self.cloned_library)
+
+        run_funcs(self, db, ndb, (
+            ('set', 0, 'title', 'newtitle'),
+            ('set', 0, 'tags', 't1,t2,tag one', True),
+            ('set', 0, 'authors', 'author one & Author Two', True),
+            ('set', 0, 'rating', 3.2),
+            ('set', 0, 'publisher', 'publisher one', True),
+            (db.refresh,),
+            ('title', 0),
+            ('rating', 0),
+            ('#tags', 0), ('#tags', 1), ('#tags', 2),
+            ('authors', 0), ('authors', 1), ('authors', 2),
+            ('publisher', 0), ('publisher', 1), ('publisher', 2),
+        ))
+        db.close()
+
+    # }}}
diff --git a/src/calibre/db/write.py b/src/calibre/db/write.py
index 9bae3e6abb..a257788a60 100644
--- a/src/calibre/db/write.py
+++ b/src/calibre/db/write.py
@@ -142,7 +142,7 @@ def get_adapter(name, metadata):
     elif dt == 'comments':
         ans = single_text
     elif dt == 'rating':
-        ans = lambda x: None if x in {None, 0} else min(10., max(0., adapt_number(float, x)))
+        ans = lambda x: None if x in {None, 0} else min(10, max(0, adapt_number(int, x)))
     elif dt == 'enumeration':
         ans = single_text
     elif dt == 'composite':
diff --git a/src/calibre/library/database2.py b/src/calibre/library/database2.py
index d23633e433..00c6fb057f 100644
--- a/src/calibre/library/database2.py
+++ b/src/calibre/library/database2.py
@@ -2212,7 +2212,7 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
         id = self.data[row][0]
         col = self.FIELD_MAP[column]
 
-        books_to_refresh = set()
+        books_to_refresh = {id}
         set_args = (row, col, val)
         if column == 'authors':
             val = string_to_authors(val)