Add better support for "make import batch from file" pattern

tailbone/views/master.py

@@ -89,6 +89,7 @@ class MasterView(View):
     execute_progress_template = None
     execute_progress_initial_msg = None
     supports_prev_next = False
+    supports_import_batch_from_file = False
 
     supports_mobile = False
     mobile_creatable = False
@@ -705,7 +706,11 @@ class MasterView(View):
             if isinstance(node.typ, deform.FileData):
                 if skip and node.name in skip:
                     continue
-                filedict = self.form_deserialized.get(node.name)
+                # TODO: does form ever *not* have 'validated' attr here?
+                if hasattr(form, 'validated'):
+                    filedict = form.validated.get(node.name)
+                else:
+                    filedict = self.form_deserialized.get(node.name)
                 if filedict:
                     tempdir = tempfile.mkdtemp()
                     filepath = os.path.join(tempdir, filedict['filename'])
@@ -722,6 +727,38 @@ class MasterView(View):
     def process_uploads(self, obj, form, uploads):
         pass
 
+    def import_batch_from_file(self, handler_factory, model_name,
+                               delete=False, schema=None, importer_host_title=None):
+
+        handler = handler_factory(self.rattail_config)
+
+        if not schema:
+            schema = forms.SimpleFileImport().bind(request=self.request)
+        form = forms.Form(schema=schema, request=self.request)
+        form.save_label = "Upload"
+        form.cancel_url = self.get_index_url()
+        if form.validate(newstyle=True):
+
+            uploads = self.normalize_uploads(form)
+            filepath = uploads['filename']['temp_path']
+            batches = handler.make_batches(model_name,
+                                           delete=delete,
+                                           # tdc_input_path=filepath,
+                                           # source_csv_path=filepath,
+                                           source_data_path=filepath,
+                                           runas_user=self.request.user)
+            batch = batches[0]
+            return self.redirect(self.request.route_url('batch.importer.view', uuid=batch.uuid))
+
+        if not importer_host_title:
+            importer_host_title = handler.host_title
+
+        return self.render_to_response('import_file', {
+            'form': form,
+            'dform': form.make_deform_form(),
+            'importer_host_title': importer_host_title,
+        })
+
     def render_product_key_value(self, obj):
         """
         Render the "canonical" product key value for the given object.
@@ -3087,6 +3124,11 @@ class MasterView(View):
             config.add_tailbone_permission(permission_prefix, '{0}.delete'.format(permission_prefix),
                                            "Delete {0}".format(model_title))
 
+        # import batch from file
+        if cls.supports_import_batch_from_file:
+            config.add_tailbone_permission(permission_prefix, '{}.import_file'.format(permission_prefix),
+                                           "Create a new import batch from data file")
+
         ### sub-rows stuff follows
 
         # download row results as CSV