*) Don't apply filter if the term is empty

   see https://github.com/mrjoes/flask-admin/pull/535

flask_admin/contrib/mongoengine/ajax.py

@@ -50,17 +50,18 @@ class QueryAjaxModelLoader(AjaxModelLoader):
     def get_list(self, term, offset=0, limit=DEFAULT_PAGE_SIZE):
         query = self.model.objects
 
-        criteria = None
+        if len(term) > 0:
+            criteria = None
 
-        for field in self._cached_fields:
-            flt = {u'%s__icontains' % field.name: term}
+            for field in self._cached_fields:
+                flt = {u'%s__icontains' % field.name: term}
 
-            if not criteria:
-                criteria = mongoengine.Q(**flt)
-            else:
-                criteria |= mongoengine.Q(**flt)
+                if not criteria:
+                    criteria = mongoengine.Q(**flt)
+                else:
+                    criteria |= mongoengine.Q(**flt)
 
-        query = query.filter(criteria)
+            query = query.filter(criteria)
 
         if offset:
             query = query.skip(offset)

flask_admin/contrib/peewee/ajax.py

@@ -52,16 +52,17 @@ class QueryAjaxModelLoader(AjaxModelLoader):
     def get_list(self, term, offset=0, limit=DEFAULT_PAGE_SIZE):
         query = self.model.select()
 
-        stmt = None
-        for field in self._cached_fields:
-            q = field ** (u'%%%s%%' % term)
+        if len(term) > 0:
+            stmt = None
+            for field in self._cached_fields:
+                q = field ** (u'%%%s%%' % term)
 
-            if stmt is None:
-                stmt = q
-            else:
-                stmt |= q
+                if stmt is None:
+                    stmt = q
+                else:
+                    stmt |= q
 
-        query = query.where(stmt)
+            query = query.where(stmt)
 
         if offset:
             query = query.offset(offset)

flask_admin/contrib/sqla/ajax.py

@@ -58,8 +58,9 @@ class QueryAjaxModelLoader(AjaxModelLoader):
     def get_list(self, term, offset=0, limit=DEFAULT_PAGE_SIZE):
         query = self.session.query(self.model)
 
-        filters = (field.like(u'%%%s%%' % term) for field in self._cached_fields)
-        query = query.filter(or_(*filters))
+        if len(term) > 0:
+            filters = (field.like(u'%%%s%%' % term) for field in self._cached_fields)
+            query = query.filter(or_(*filters))
 
         return query.offset(offset).limit(limit).all()