Let a grid have custom ajax data url

i.e. instead of assuming we should GET the current "partial" page, can use a
different URL altogether now

tailbone/grids/core.py

@@ -74,6 +74,7 @@ class Grid(object):
                  sortable=False, sorters={}, default_sortkey=None, default_sortdir='asc',
                  pageable=False, default_pagesize=20, default_page=1,
                  checkboxes=False, checked=None, main_actions=[], more_actions=[], delete_speedbump=False,
+                 ajax_data_url=None,
                  **kwargs):
 
         self.key = key
@@ -127,6 +128,13 @@ class Grid(object):
         self.more_actions = more_actions or []
         self.delete_speedbump = delete_speedbump
 
+        if ajax_data_url:
+            self.ajax_data_url = ajax_data_url
+        elif self.request:
+            self.ajax_data_url = self.request.current_route_url()
+        else:
+            self.ajax_data_url = ''
+
         self._whgrid_kwargs = kwargs
 
     def make_columns(self):

tailbone/static/js/tailbone.buefy.grid.js

@@ -46,7 +46,7 @@ let TailboneGrid = {
             }
 
             this.loading = true
-            this.$http.get(`?${params}`).then(({ data }) => {
+            this.$http.get(`${this.ajaxDataUrl}?${params}`).then(({ data }) => {
                 this.data = data.data
                 this.rowStatusMap = data.row_status_map
                 this.total = data.total_items

tailbone/templates/grids/buefy.mako

@@ -205,6 +205,7 @@
       loading: false,
       checkedRows: [],
       selectedFilter: null,
+      ajaxDataUrl: ${json.dumps(grid.ajax_data_url)|n},
 
       data: ${json.dumps(grid_data['data'])|n},
       rowStatusMap: ${json.dumps(grid_data['row_status_map'])|n},