Using text field instead of ObjectIdField.

Author: WaVEV

django_mongodb/fields/__init__.py

@@ -1,9 +1,8 @@
 from .auto import ObjectIdAutoField
 from .duration import register_duration_field
 from .json import register_json_field
-from .object_id import ObjectIdField
 
-__all__ = ["register_fields", "ObjectIdAutoField", "ObjectIdField"]
+__all__ = ["register_fields", "ObjectIdAutoField"]
 
 
 def register_fields():

django_mongodb/fields/object_id.py

@@ -115,7 +115,7 @@ def join(self, compiler, connection):
                 # The pipeline variables to be matched in the pipeline's
                 # expression.
                 "let": {
-                    f"{parent_template}{i}": parent_field
+                    f"{parent_template}{i}": {"$toString": parent_field}
                     for i, parent_field in enumerate(lhs_fields)
                 },
                 "pipeline": [
@@ -129,7 +129,7 @@ def join(self, compiler, connection):
                         "$match": {
                             "$expr": {
                                 "$and": [
-                                    {"$eq": [f"$${parent_template}{i}", field]}
+                                    {"$eq": [f"$${parent_template}{i}", {"$toString": field}]}
                                     for i, field in enumerate(rhs_fields)
                                 ]
                             }