Mark exportable invoice as deleted, instead of actually deleting

and allow bulk-delete, but prevent edit

tailbone_quickbooks/views/quickbooks/invoices.py

@@ -54,6 +54,8 @@ class ExportableInvoiceView(MasterView):
     model_class = QuickbooksExportableInvoice
     route_prefix = 'quickbooks.exportable_invoices'
     url_prefix = '/quickbooks/exportable-invoices'
+    editable = False
+    bulk_deletable = True
     has_versions = True
 
     labels = {
@@ -171,6 +173,8 @@ class ExportableInvoiceView(MasterView):
             g.check_all_handler = 'allChecked'
 
     def grid_extra_class(self, invoice, i):
+        if invoice.deleted:
+            return 'warning'
         if not self.exportable(invoice):
             if invoice.status_code in (invoice.STATUS_DEPTS_IGNORED,
                                        invoice.STATUS_EXPORTED,
@@ -203,6 +207,22 @@ class ExportableInvoiceView(MasterView):
         """
         return invoice.status_code == invoice.STATUS_EXPORTABLE
 
+    def deletable_instance(self, invoice):
+        if invoice.deleted:
+            return False
+        if invoice.exported:
+            return False
+        return True
+
+    def delete_instance(self, invoice):
+        app = self.get_rattail_app()
+        session = app.get_session(invoice)
+        invoice.deleted = app.make_utc()
+        # nb. when bulk-deleting, user is in different session
+        invoice.deleted_by = session.merge(self.request.user)
+        invoice.status_code = invoice.STATUS_DELETED
+        session.flush()
+
     def configure_form(self, f):
         super(ExportableInvoiceView, self).configure_form(f)
         model = self.model