fix: More work on typing support; add black and ruff

.github/workflows/test.yml

@@ -32,15 +32,24 @@ jobs:
           - 27017:27017
     steps:
       - uses: actions/checkout@v3
+      - name: Install poetry
+        run: pipx install poetry
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python }}
+          cache: 'poetry'
+      - name: Cache virtualenv
+        uses: actions/cache@v3
+        with:
+          key: venv-${{ runner.os }}-${{ steps.setup_python.outputs.python-version}}-${{ hashFiles('poetry.lock') }}
+          path: .venv
       - name: Set up env
         run: |
-          python -m pip install -U -q poetry pip
           poetry install -q
           poetry run pip install -q "${{ matrix.django }}"
       - name: Run tests
         run: |
+          poetry run ruff .
+          poetry run black --check .
           poetry run python -m pytest

Makefile

@@ -12,3 +12,8 @@ publish:
 
 test:
 	poetry run python -m pytest
+
+codegen:
+	python codegen.py
+	black django_mongoengine/fields/__init__.py
+	ruff django_mongoengine/ --fix  # It doesn't work with filename.

codegen.py

@@ -0,0 +1,31 @@
+def generate_fields():
+    """
+    Typing support cannot handle monkey-patching at runtime, so we need to generate fields explicitly.
+    """
+    from mongoengine import fields
+    from django_mongoengine.fields import djangoflavor as mixins
+
+    fields_code = str(_fields)
+    for fname in fields.__all__:
+        mixin_name = fname if hasattr(mixins, fname) else "DjangoField"
+        fields_code += f"class {fname}(_mixins.{mixin_name}, _fields.{fname}):\n    pass\n"
+
+    return fields_code
+
+
+_fields = """
+from mongoengine import fields as _fields
+from . import djangoflavor as _mixins
+from django_mongoengine.utils.monkey import patch_mongoengine_field
+
+for f in ["StringField", "ObjectIdField"]:
+    patch_mongoengine_field(f)
+
+"""
+
+if __name__ == "__main__":
+    fname = "django_mongoengine/fields/__init__.py"
+    # This content required, because otherwise mixins import does not work.
+    open(fname, "w").write("from mongoengine.fields import *")
+    content = generate_fields()
+    open(fname, "w").write(content)

django_mongoengine/document.py

@@ -2,7 +2,7 @@
 from __future__ import annotations
 
 from functools import partial
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING
 
 from bson.objectid import ObjectId
 from django.db.models import Model
@@ -11,11 +11,15 @@
 from mongoengine import document as me
 from mongoengine.base import metaclasses as mtc
 from mongoengine.errors import FieldDoesNotExist
+from typing_extensions import Self
 
 from .fields import ObjectIdField
 from .forms.document_options import DocumentMetaWrapper
 from .queryset import QuerySetManager
 
+if TYPE_CHECKING:
+    from mongoengine.fields import StringField
+
 # TopLevelDocumentMetaclass is using ObjectIdField to create default pk field,
 # if one's not set explicitly.
 # We need to know it's not editable and auto_created.
@@ -43,11 +47,11 @@ def __new__(cls, name, bases, attrs):
 
 
 class DjangoFlavor:
-    id: Any
-    objects: Any = QuerySetManager()
-    _meta: DocumentMetaWrapper
-    _default_manager: Any = QuerySetManager()
+    id: StringField
+    objects = QuerySetManager[Self]()
+    _default_manager = QuerySetManager[Self]()
     _get_pk_val = Model.__dict__["_get_pk_val"]
+    _meta: DocumentMetaWrapper
     DoesNotExist: type[DoesNotExist]
 
     def __init__(self, *args, **kwargs):
@@ -115,7 +119,7 @@ class DynamicDocument(DjangoFlavor, me.DynamicDocument):
         ...
 
     class EmbeddedDocument(DjangoFlavor, me.EmbeddedDocument):
-        ...
+        _instance: Document
 
     class DynamicEmbeddedDocument(DjangoFlavor, me.DynamicEmbeddedDocument):
         ...

django_mongoengine/fields/__init__.py

@@ -1,43 +1,182 @@
-from . import djangoflavor
+from mongoengine import fields as _fields
+from . import djangoflavor as _mixins
+from django_mongoengine.utils.monkey import patch_mongoengine_field
 
+for f in ["StringField", "ObjectIdField"]:
+    patch_mongoengine_field(f)
 
-def init_module():
-    """
-    Create classes with Django-flavor mixins,
-    use DjangoField mixin as default
-    """
-    import sys
 
-    from mongoengine import fields
+class StringField(_mixins.StringField, _fields.StringField):
+    pass
 
-    current_module = sys.modules[__name__]
-    current_module.__all__ = fields.__all__
 
-    for name in fields.__all__:
-        fieldcls = getattr(fields, name)
-        mixin = getattr(djangoflavor, name, djangoflavor.DjangoField)
-        setattr(
-            current_module,
-            name,
-            type(name, (mixin, fieldcls), {}),
-        )
+class URLField(_mixins.URLField, _fields.URLField):
+    pass
 
 
-def patch_mongoengine_field(field_name):
-    """
-    patch mongoengine.[field_name] for comparison support
-    becouse it's required in django.forms.models.fields_for_model
-    importing using mongoengine internal import cache
-    """
-    from mongoengine import common
+class EmailField(_mixins.EmailField, _fields.EmailField):
+    pass
 
-    field = common._import_class(field_name)
-    for k in ["__eq__", "__lt__", "__hash__", "attname", "get_internal_type"]:
-        if k not in field.__dict__:
-            setattr(field, k, djangoflavor.DjangoField.__dict__[k])
 
+class IntField(_mixins.IntField, _fields.IntField):
+    pass
 
-init_module()
 
-for f in ["StringField", "ObjectIdField"]:
-    patch_mongoengine_field(f)
+class LongField(_mixins.DjangoField, _fields.LongField):
+    pass
+
+
+class FloatField(_mixins.FloatField, _fields.FloatField):
+    pass
+
+
+class DecimalField(_mixins.DecimalField, _fields.DecimalField):
+    pass
+
+
+class BooleanField(_mixins.BooleanField, _fields.BooleanField):
+    pass
+
+
+class DateTimeField(_mixins.DateTimeField, _fields.DateTimeField):
+    pass
+
+
+class DateField(_mixins.DjangoField, _fields.DateField):
+    pass
+
+
+class ComplexDateTimeField(_mixins.DjangoField, _fields.ComplexDateTimeField):
+    pass
+
+
+class EmbeddedDocumentField(_mixins.EmbeddedDocumentField, _fields.EmbeddedDocumentField):
+    pass
+
+
+class ObjectIdField(_mixins.DjangoField, _fields.ObjectIdField):
+    pass
+
+
+class GenericEmbeddedDocumentField(_mixins.DjangoField, _fields.GenericEmbeddedDocumentField):
+    pass
+
+
+class DynamicField(_mixins.DjangoField, _fields.DynamicField):
+    pass
+
+
+class ListField(_mixins.ListField, _fields.ListField):
+    pass
+
+
+class SortedListField(_mixins.DjangoField, _fields.SortedListField):
+    pass
+
+
+class EmbeddedDocumentListField(_mixins.DjangoField, _fields.EmbeddedDocumentListField):
+    pass
+
+
+class DictField(_mixins.DictField, _fields.DictField):
+    pass
+
+
+class MapField(_mixins.DjangoField, _fields.MapField):
+    pass
+
+
+class ReferenceField(_mixins.ReferenceField, _fields.ReferenceField):
+    pass
+
+
+class CachedReferenceField(_mixins.DjangoField, _fields.CachedReferenceField):
+    pass
+
+
+class LazyReferenceField(_mixins.DjangoField, _fields.LazyReferenceField):
+    pass
+
+
+class GenericLazyReferenceField(_mixins.DjangoField, _fields.GenericLazyReferenceField):
+    pass
+
+
+class GenericReferenceField(_mixins.DjangoField, _fields.GenericReferenceField):
+    pass
+
+
+class BinaryField(_mixins.DjangoField, _fields.BinaryField):
+    pass
+
+
+class GridFSError(_mixins.DjangoField, _fields.GridFSError):
+    pass
+
+
+class GridFSProxy(_mixins.DjangoField, _fields.GridFSProxy):
+    pass
+
+
+class FileField(_mixins.FileField, _fields.FileField):
+    pass
+
+
+class ImageGridFsProxy(_mixins.DjangoField, _fields.ImageGridFsProxy):
+    pass
+
+
+class ImproperlyConfigured(_mixins.ImproperlyConfigured, _fields.ImproperlyConfigured):
+    pass
+
+
+class ImageField(_mixins.ImageField, _fields.ImageField):
+    pass
+
+
+class GeoPointField(_mixins.DjangoField, _fields.GeoPointField):
+    pass
+
+
+class PointField(_mixins.DjangoField, _fields.PointField):
+    pass
+
+
+class LineStringField(_mixins.DjangoField, _fields.LineStringField):
+    pass
+
+
+class PolygonField(_mixins.DjangoField, _fields.PolygonField):
+    pass
+
+
+class SequenceField(_mixins.DjangoField, _fields.SequenceField):
+    pass
+
+
+class UUIDField(_mixins.DjangoField, _fields.UUIDField):
+    pass
+
+
+class EnumField(_mixins.DjangoField, _fields.EnumField):
+    pass
+
+
+class MultiPointField(_mixins.DjangoField, _fields.MultiPointField):
+    pass
+
+
+class MultiLineStringField(_mixins.DjangoField, _fields.MultiLineStringField):
+    pass
+
+
+class MultiPolygonField(_mixins.DjangoField, _fields.MultiPolygonField):
+    pass
+
+
+class GeoJsonBaseField(_mixins.DjangoField, _fields.GeoJsonBaseField):
+    pass
+
+
+class Decimal128Field(_mixins.DjangoField, _fields.Decimal128Field):
+    pass

django_mongoengine/forms/fields.py

@@ -107,7 +107,7 @@ def __init__(self, form, *args, **kwargs):
         kwargs['widget'] = EmbeddedFieldWidget(self.form.fields)
         kwargs['initial'] = [f.initial for f in self.form.fields.values()]
         kwargs['require_all_fields'] = False
-        super().__init__(fields=tuple([f for f in self.form.fields.values()]), *args, **kwargs)
+        super().__init__(fields=tuple(self.form.fields.values()), *args, **kwargs)
 
     def bound_data(self, data, initial):
         return data