Use sqlalchemy-filters package for REST API collection_get

just sorting and pagination so far though, no actual filters yet

setup.py

@@ -88,6 +88,7 @@ requires = [
     'pyramid_tm',                       # 0.3
     'rattail[db,bouncer]',              # 0.5.0
     'six',                              # 1.10.0
+    'sqlalchemy-filters',               # 0.8.0
     'transaction',                      # 1.2.0
     'waitress',                         # 0.8.1
     'WebHelpers2',                      # 2.0

tailbone/api/master.py

@@ -26,7 +26,7 @@ Tailbone Web API - Master View
 
 from __future__ import unicode_literals, absolute_import
 
-from paginate_sqlalchemy import SqlalchemyOrmPage
+from sqlalchemy_filters import apply_sort, apply_pagination
 
 from tailbone.api import APIView, api
 from tailbone.db import Session
@@ -67,26 +67,51 @@ class APIMasterView(APIView):
 
     def _collection_get(self):
         cls = self.get_model_class()
-        objects = self.Session.query(cls)
+        query = self.Session.query(cls)
+        context = {}
 
+        # TODO: should vuetable (etc.) be sending us valid sort_spec directly?
         sort = self.request.params.get('sort')
         if sort:
             # TODO: this is fragile, but what to do if bad params?
             sortkey, sortdir = sort.split('|')
-            sortkey = getattr(cls, sortkey)
-            objects = objects.order_by(getattr(sortkey, sortdir)())
+            if sortdir != 'desc':
+                sortdir = 'asc'
 
-            # NOTE: we only page results if sorting is in effect, otherwise
+            sort_spec = [
+                {
+                    # 'model': self.model_class.__name__,
+                    'field': sortkey,
+                    'direction': sortdir,
+                },
+            ]
+            query = apply_sort(query, sort_spec)
+
+            # NOTE: we only paginate results if sorting is in effect, otherwise
             # record sequence is "non-determinant" (is that the word?)
             page = self.request.params.get('page')
             per_page = self.request.params.get('per_page')
             if page.isdigit() and per_page.isdigit():
                 page = int(page)
                 per_page = int(per_page)
-                objects = SqlalchemyOrmPage(objects, items_per_page=per_page, page=page)
+                query, pagination = apply_pagination(query, page_number=page, page_size=per_page)
 
-        objects = [self.normalize(obj) for obj in objects]
-        return {self.get_collection_key(): objects}
+                # these pagination values are based on 'vuetable-2'
+                # https://www.vuetable.com/guide/pagination.html#how-the-pagination-component-works
+                context['total'] = pagination.total_results
+                context['per_page'] = pagination.page_size
+                context['current_page'] = pagination.page_number
+                context['last_page'] = pagination.num_pages
+                context['from'] = pagination.page_size * (pagination.page_number - 1) + 1
+                to = pagination.page_size * (pagination.page_number - 1) + pagination.page_size
+                if to > pagination.total_results:
+                    context['to'] = pagination.total_results
+                else:
+                    context['to'] = to
+
+        objects = [self.normalize(obj) for obj in query]
+        context[self.get_collection_key()] = objects
+        return context
 
     def _get(self):
         uuid = self.request.matchdict['uuid']