Provide context, widget and fieldname for callable base queries in AT reference widgets (senaite#1914)

* Call base query callable with context, widget and fieldname

* Changelog updated

* Return the dereferenced base query

Author: ramonski

CHANGES.rst

@@ -4,6 +4,7 @@ Changelog
 2.2.0 (unreleased)
 ------------------
 
+- #1914 Provide context, widget and fieldname for callable base queries in AT reference widgets
 - #1912 Fixed typo in sample view
 - #1909 Allow to navigate and select with arrow keys in dexterity reference widget
 - #1908 Added searchable text querystring converter to catalog API

src/senaite/core/browser/widgets/referencewidget.py

@@ -120,7 +120,10 @@ def get_combogrid_options(self, context, fieldName):
     def get_base_query(self, context, fieldName):
         base_query = self.base_query
         if callable(base_query):
-            base_query = base_query()
+            try:
+                base_query = base_query(context, self, fieldName)
+            except TypeError:
+                base_query = base_query()
         if base_query and isinstance(base_query, six.string_types):
             base_query = json.loads(base_query)
 
@@ -136,7 +139,7 @@ def get_base_query(self, context, fieldName):
             if allowed_types \
             else self.portal_types
 
-        return json.dumps(self.base_query)
+        return json.dumps(base_query)
 
     def initial_uid_field_value(self, value):
         if type(value) in (list, tuple):