document_page: improve link using menu

document_page/models/document_page.py

@@ -107,11 +107,20 @@ class DocumentPage(models.Model):
         compute='_compute_backend_url',
     )
 
-    @api.depends()
+    @api.depends('menu_id', 'parent_id.menu_id')
     def _compute_backend_url(self):
         tmpl = '/web#id={}&model=document.page&view_type=form'
         for rec in self:
-            rec.backend_url = tmpl.format(rec.id)
+            url = tmpl.format(rec.id)
+            # retrieve action
+            action = None
+            parent = rec
+            while not action and parent:
+                action = parent.menu_id.action
+                parent = parent.parent_id
+            if action:
+                url += '&action={}'.format(action.id)
+            rec.backend_url = url
 
     @api.constrains('parent_id')
     def _check_parent_id(self):
@@ -128,11 +137,9 @@ class DocumentPage(models.Model):
         r = ''
         if link:
             r = '<a href="{}">{}</a>'.format(self.backend_url, self.name)
-
         if index:
             r += "<ul>" + "".join(index) + "</ul>"
         return r
-        
 
     @api.multi
     @api.depends('history_head')