edits

Author: timgraham

django_mongodb/compiler.py

@@ -257,7 +257,7 @@ def pre_sql_setup(self, with_col_aliases=False):
                 having = self.having.replace_expressions(all_replacements).as_mql(
                     self, self.connection
                 )
-                # Add having subqueries.
+                # Add HAVING subqueries.
                 for query in self.subqueries or ():
                     pipeline.extend(query.get_pipeline())
                 # Clean added subqueries.
@@ -685,7 +685,9 @@ def execute_sql(self, result_type=MULTI):
     def check_query(self):
         super().check_query()
         if not self.single_alias:
-            raise NotSupportedError("Cannot use QuerySet.delete() when a subquery is required.")
+            raise NotSupportedError(
+                "Cannot use QuerySet.delete() when querying across multiple collections on MongoDB."
+            )
 
     def get_where(self):
         return self.query.where

django_mongodb/query_utils.py

@@ -34,8 +34,9 @@ def process_rhs(node, compiler, connection):
             value = rhs.as_mql(compiler, connection)
     else:
         _, value = node.process_rhs(compiler, connection)
+        lookup_name = node.lookup_name
         # Undo Lookup.get_db_prep_lookup() putting params in a list.
-        if node.lookup_name not in ("in", "range"):
+        if lookup_name not in ("in", "range"):
             value = value[0]
     if hasattr(node, "prep_lookup_value_mongo"):
         value = node.prep_lookup_value_mongo(value)