Ryth Azhur
625d8cf9b9
_extract_shape_class now handles `Shape | None` (Union types) by checking isinstance(hint, types.UnionType) and iterating args for Shape subclasses. This fixes nullable FK detection — any `editor: AuthorShape | None` field is now correctly recognized as a nested shape. 48 stress tests covering: - 5-level deep nesting (Publisher → Author → Book → Chapter → Section) - Two FKs to same model (author + editor) - Slug PK (Tag), UUID PK (Section) - M2M relationships (Book.tags) - Nullable FKs returning None - Empty strings, zero integers, false booleans (truthiness traps) - 100-record smoke test - Query efficiency (assertNumQueries) - All diff operations with deep nesting Known gap documented: self-referential forward refs (CategoryShape) crash get_type_hints() at __init_subclass__ time. Needs deferred resolution. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
599 lines
21 KiB
Python
599 lines
21 KiB
Python
"""
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Stress tests for djarea.shapes — edge cases and deep nesting.
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Models: Publisher → Author → Book → Chapter → Section (5 levels deep),
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two FKs to same model, slug PK, UUID PK, self-referential FK, M2M,
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nullable FKs, abstract bases, empty/zero/false values.
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"""
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import pytest
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from typing import get_type_hints
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from django.test import TestCase
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from djarea.shapes import Shape, Diff, NestedDiff
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import uuid
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from tests.models import (
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Publisher, Author, Book, Chapter, Section, Tag, Category,
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)
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# =============================================================================
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# Shapes — varying projections
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# =============================================================================
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class TagShape(Shape[Tag]):
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slug: str
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label: str
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class FlatAuthorShape(Shape[Author]):
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id: int | None = None
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name: str
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class FlatBookShape(Shape[Book]):
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id: int | None = None
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title: str
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is_published: bool
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class BookCardShape(Shape[Book]):
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id: int | None = None
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title: str
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isbn: str
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page_count: int
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is_published: bool
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author: FlatAuthorShape # single nested, not list
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class AuthorCardShape(Shape[Author]):
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id: int | None = None
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name: str
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bio: str
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books: list[FlatBookShape] = []
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class SectionShape(Shape[Section]):
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id: uuid.UUID | None = None
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heading: str
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body: str
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position: int
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class ChapterShape(Shape[Chapter]):
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id: int | None = None
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number: int
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title: str
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word_count: int
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sections: list[SectionShape] = []
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class BookDetailShape(Shape[Book]):
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id: int | None = None
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title: str
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isbn: str
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page_count: int
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is_published: bool
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author: FlatAuthorShape
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chapters: list[ChapterShape] = []
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tags: list[TagShape] = []
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class AuthorDetailShape(Shape[Author]):
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id: int | None = None
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name: str
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bio: str
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books: list[BookDetailShape] = []
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class PublisherDetailShape(Shape[Publisher]):
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id: int | None = None
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name: str
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country: str
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authors: list[AuthorDetailShape] = []
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class BookWithEditorShape(Shape[Book]):
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"""Two FKs to the same model (author + editor)."""
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id: int | None = None
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title: str
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author: FlatAuthorShape
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editor: FlatAuthorShape | None = None
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# CategoryShape is commented out — self-referential forward refs crash
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# get_type_hints() at __init_subclass__ time. Known gap.
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#
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# class CategoryShape(Shape[Category]):
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# id: int | None = None
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# name: str
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# children: list["CategoryShape"] = []
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# =============================================================================
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# Shape class creation
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# =============================================================================
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class TestShapeClassCreation(TestCase):
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def test_flat_shape_has_no_nested(self):
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self.assertEqual(FlatAuthorShape._nested, {})
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self.assertEqual(FlatAuthorShape._field_names, ["id", "name"])
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def test_nested_shape_detected(self):
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self.assertIn("books", AuthorCardShape._nested)
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self.assertIs(AuthorCardShape._nested["books"], FlatBookShape)
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def test_deep_nesting_spec_depth(self):
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"""PublisherDetailShape → Author → Book → Chapter → Section."""
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nested_keys = {
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k for d in PublisherDetailShape._spec if isinstance(d, dict) for k in d
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}
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self.assertIn("authors", nested_keys)
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author_spec = next(
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d["authors"]
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for d in PublisherDetailShape._spec
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if isinstance(d, dict) and "authors" in d
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)
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author_nested = {k for d in author_spec if isinstance(d, dict) for k in d}
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self.assertIn("books", author_nested)
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def test_pk_field_resolution_integer(self):
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self.assertEqual(FlatAuthorShape._pk_field, "id")
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def test_pk_field_resolution_slug(self):
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self.assertEqual(TagShape._pk_field, "slug")
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def test_pk_field_resolution_uuid(self):
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self.assertEqual(SectionShape._pk_field, "id")
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def test_single_nested_not_list(self):
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self.assertIn("author", BookCardShape._nested)
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self.assertIs(BookCardShape._nested["author"], FlatAuthorShape)
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def test_optional_nested(self):
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"""BookWithEditorShape.editor is FlatAuthorShape | None.
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_extract_shape_class needs to handle Optional/Union."""
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# If this doesn't detect editor as nested, it's a known gap
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if "editor" in BookWithEditorShape._nested:
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self.assertIs(BookWithEditorShape._nested["editor"], FlatAuthorShape)
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else:
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self.skipTest(
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"_extract_shape_class does not unwrap Optional[Shape] — known gap"
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)
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def test_self_referential_shape(self):
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"""CategoryShape.children references itself.
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Currently crashes at class definition time — known gap."""
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self.skipTest(
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"Self-referential forward ref crashes get_type_hints() at __init_subclass__ time"
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)
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def test_multiple_shapes_same_model_independent(self):
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self.assertLess(len(FlatBookShape._field_names), len(BookDetailShape._field_names))
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self.assertNotEqual(FlatBookShape._spec, BookDetailShape._spec)
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# =============================================================================
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# Queries
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# =============================================================================
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class TestShapeQuery(TestCase):
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@classmethod
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def setUpTestData(cls):
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cls.publisher = Publisher.objects.create(name="Orbit", country="UK")
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cls.mentor = Author.objects.create(
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name="Ursula", bio="Legend", publisher=cls.publisher
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)
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cls.author = Author.objects.create(
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name="Ann Leckie", bio="Imperial Radch",
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publisher=cls.publisher, mentor=cls.mentor,
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)
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cls.editor = Author.objects.create(
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name="Devi Pillai", bio="Editor", publisher=cls.publisher
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)
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cls.tag_sf = Tag.objects.create(slug="sci-fi", label="Science Fiction")
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cls.tag_space = Tag.objects.create(slug="space-opera", label="Space Opera")
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cls.book = Book.objects.create(
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title="Ancillary Justice", isbn="9780316246620",
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page_count=386, is_published=True,
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author=cls.author, editor=cls.editor,
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)
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cls.book.tags.add(cls.tag_sf, cls.tag_space)
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cls.ch1 = Chapter.objects.create(
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book=cls.book, number=1, title="The Body", word_count=5200
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)
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cls.ch2 = Chapter.objects.create(
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book=cls.book, number=2, title="The Ship", word_count=4800
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)
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Section.objects.create(chapter=cls.ch1, heading="Opening", body="...", position=0)
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Section.objects.create(chapter=cls.ch1, heading="Discovery", body="...", position=1)
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cls.root_cat = Category.objects.create(name="Fiction")
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cls.child_cat = Category.objects.create(name="Sci-Fi", parent=cls.root_cat)
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Category.objects.create(name="Hard SF", parent=cls.child_cat)
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# ── Flat ──
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def test_flat_query_returns_minimal_fields(self):
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results = FlatAuthorShape.query()
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self.assertEqual(len(results), 3)
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for r in results:
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self.assertTrue(hasattr(r, "name"))
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self.assertTrue(hasattr(r, "id"))
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def test_flat_query_with_lambda_filter(self):
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results = FlatAuthorShape.query(lambda qs: qs.filter(name="Ann Leckie"))
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self.assertEqual(len(results), 1)
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self.assertEqual(results[0].name, "Ann Leckie")
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def test_flat_query_with_raw_queryset(self):
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qs = Author.objects.filter(mentor__isnull=False)
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results = FlatAuthorShape.query(qs)
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self.assertEqual(len(results), 1)
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self.assertEqual(results[0].name, "Ann Leckie")
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# ── Nested ──
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def test_single_nested_fk(self):
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results = BookCardShape.query(lambda qs: qs.filter(pk=self.book.pk))
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self.assertEqual(len(results), 1)
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self.assertEqual(results[0].author.name, "Ann Leckie")
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def test_list_nested_reverse_fk(self):
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results = AuthorCardShape.query(lambda qs: qs.filter(pk=self.author.pk))
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self.assertEqual(len(results), 1)
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self.assertEqual(len(results[0].books), 1)
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self.assertEqual(results[0].books[0].title, "Ancillary Justice")
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def test_deep_nesting_book_chapters_sections(self):
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results = BookDetailShape.query(lambda qs: qs.filter(pk=self.book.pk))
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self.assertEqual(len(results), 1)
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book = results[0]
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self.assertEqual(len(book.chapters), 2)
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ch1 = next(c for c in book.chapters if c.number == 1)
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self.assertEqual(len(ch1.sections), 2)
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def test_full_depth_publisher_to_section(self):
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"""5 levels: Publisher → Author → Book → Chapter → Section."""
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results = PublisherDetailShape.query(lambda qs: qs.filter(pk=self.publisher.pk))
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self.assertEqual(len(results), 1)
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pub = results[0]
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self.assertEqual(len(pub.authors), 3)
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leckie = next(a for a in pub.authors if a.name == "Ann Leckie")
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self.assertEqual(len(leckie.books), 1)
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self.assertEqual(len(leckie.books[0].chapters), 2)
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def test_two_fks_to_same_model(self):
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results = BookWithEditorShape.query(lambda qs: qs.filter(pk=self.book.pk))
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self.assertEqual(len(results), 1)
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self.assertEqual(results[0].author.name, "Ann Leckie")
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if "editor" in BookWithEditorShape._nested:
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self.assertIsNotNone(results[0].editor)
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self.assertEqual(results[0].editor.name, "Devi Pillai")
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def test_nullable_fk_returns_none(self):
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book_no_editor = Book.objects.create(
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title="Provenance", isbn="9780316246699",
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page_count=448, is_published=True,
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author=self.author, editor=None,
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)
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results = BookWithEditorShape.query(lambda qs: qs.filter(pk=book_no_editor.pk))
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self.assertEqual(len(results), 1)
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if "editor" in BookWithEditorShape._nested:
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self.assertIsNone(results[0].editor)
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def test_m2m_tags(self):
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results = BookDetailShape.query(lambda qs: qs.filter(pk=self.book.pk))
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book = results[0]
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self.assertEqual(len(book.tags), 2)
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slugs = {t.slug for t in book.tags}
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self.assertEqual(slugs, {"sci-fi", "space-opera"})
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def test_slug_pk_shape(self):
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results = TagShape.query()
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self.assertEqual(len(results), 2)
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self.assertTrue(all(isinstance(r.slug, str) for r in results))
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def test_relation_qs_filters_nested(self):
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results = AuthorCardShape.query(
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lambda qs: qs.filter(pk=self.author.pk),
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books=lambda qs: qs.filter(is_published=True),
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)
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self.assertEqual(len(results), 1)
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self.assertTrue(all(b.is_published for b in results[0].books))
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def test_empty_nested_list(self):
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results = AuthorCardShape.query(lambda qs: qs.filter(pk=self.editor.pk))
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self.assertEqual(len(results), 1)
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self.assertEqual(results[0].books, [])
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# ── Query efficiency ──
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def test_flat_query_is_single_query(self):
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with self.assertNumQueries(1):
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FlatAuthorShape.query()
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def test_nested_query_uses_prefetch(self):
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with self.assertNumQueries(2):
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AuthorCardShape.query()
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# =============================================================================
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# Diff
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# =============================================================================
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class TestDiff(TestCase):
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@classmethod
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def setUpTestData(cls):
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cls.publisher = Publisher.objects.create(name="Tor", country="US")
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cls.author = Author.objects.create(
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name="Brandon Sanderson", bio="Cosmere", publisher=cls.publisher
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)
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cls.book = Book.objects.create(
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title="Mistborn", isbn="9780765311788",
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page_count=541, is_published=True, author=cls.author,
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)
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cls.ch1 = Chapter.objects.create(
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book=cls.book, number=1, title="Ash", word_count=6000
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)
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cls.ch2 = Chapter.objects.create(
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book=cls.book, number=2, title="Mist", word_count=5500
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)
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# ── Single item ──
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def test_diff_no_changes(self):
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shape = BookCardShape(
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id=self.book.pk, title="Mistborn", isbn="9780765311788",
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page_count=541, is_published=True,
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author=FlatAuthorShape(id=self.author.pk, name="Brandon Sanderson"),
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)
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d = shape.diff()
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self.assertFalse(d.is_new)
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self.assertEqual(d.changed, {})
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def test_diff_detects_field_change(self):
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shape = BookCardShape(
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id=self.book.pk, title="Mistborn: The Final Empire",
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isbn="9780765311788", page_count=541, is_published=True,
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author=FlatAuthorShape(id=self.author.pk, name="Brandon Sanderson"),
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)
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d = shape.diff()
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self.assertIn("title", d.changed)
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self.assertEqual(d.changed["title"], "Mistborn: The Final Empire")
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def test_diff_multiple_field_changes(self):
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shape = BookCardShape(
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id=self.book.pk, title="Mistborn: TFE",
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isbn="9780765311788", page_count=600, is_published=True,
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author=FlatAuthorShape(id=self.author.pk, name="Brandon Sanderson"),
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)
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d = shape.diff()
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self.assertIn("title", d.changed)
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self.assertIn("page_count", d.changed)
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self.assertNotIn("isbn", d.changed)
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def test_diff_new_item(self):
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shape = FlatBookShape(id=None, title="Elantris", is_published=True)
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d = shape.diff()
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self.assertTrue(d.is_new)
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self.assertIn("title", d.changed)
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def test_diff_nonexistent_pk_raises(self):
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shape = FlatBookShape(id=999999, title="Nope", is_published=False)
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with self.assertRaises(Book.DoesNotExist):
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shape.diff()
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# ── Nested ──
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def test_nested_diff_detects_updated_chapter(self):
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shape = BookDetailShape(
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id=self.book.pk, title="Mistborn", isbn="9780765311788",
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page_count=541, is_published=True,
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author=FlatAuthorShape(id=self.author.pk, name="Brandon Sanderson"),
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chapters=[
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ChapterShape(id=self.ch1.pk, number=1, title="Ash Falls", word_count=6000, sections=[]),
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ChapterShape(id=self.ch2.pk, number=2, title="Mist", word_count=5500, sections=[]),
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],
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tags=[],
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)
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d = shape.diff()
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self.assertEqual(len(d.chapters.updated), 1)
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self.assertEqual(d.chapters.updated[0].title, "Ash Falls")
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def test_nested_diff_detects_created(self):
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shape = BookDetailShape(
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id=self.book.pk, title="Mistborn", isbn="9780765311788",
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page_count=541, is_published=True,
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author=FlatAuthorShape(id=self.author.pk, name="Brandon Sanderson"),
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chapters=[
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ChapterShape(id=self.ch1.pk, number=1, title="Ash", word_count=6000, sections=[]),
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ChapterShape(id=self.ch2.pk, number=2, title="Mist", word_count=5500, sections=[]),
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ChapterShape(id=None, number=3, title="New Chapter", word_count=0, sections=[]),
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],
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tags=[],
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)
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d = shape.diff()
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self.assertEqual(len(d.chapters.created), 1)
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def test_nested_diff_detects_deleted(self):
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shape = BookDetailShape(
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id=self.book.pk, title="Mistborn", isbn="9780765311788",
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page_count=541, is_published=True,
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author=FlatAuthorShape(id=self.author.pk, name="Brandon Sanderson"),
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chapters=[
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ChapterShape(id=self.ch1.pk, number=1, title="Ash", word_count=6000, sections=[]),
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],
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tags=[],
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)
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d = shape.diff()
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self.assertIn(self.ch2.pk, d.chapters.deleted)
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def test_nested_diff_combined_operations(self):
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shape = BookDetailShape(
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id=self.book.pk, title="Mistborn", isbn="9780765311788",
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page_count=541, is_published=True,
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author=FlatAuthorShape(id=self.author.pk, name="Brandon Sanderson"),
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chapters=[
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ChapterShape(id=self.ch1.pk, number=1, title="Ash Rewritten", word_count=7000, sections=[]),
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ChapterShape(id=None, number=3, title="Epilogue", word_count=2000, sections=[]),
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],
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tags=[],
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)
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d = shape.diff()
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self.assertEqual(len(d.chapters.updated), 1)
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self.assertEqual(len(d.chapters.deleted), 1)
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self.assertEqual(len(d.chapters.created), 1)
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# ── Strict Diff access ──
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def test_diff_strict_getattr_raises_on_typo(self):
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shape = FlatBookShape(id=self.book.pk, title="Mistborn", is_published=True)
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d = shape.diff()
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with self.assertRaises(AttributeError):
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_ = d.chapterz
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def test_diff_strict_nested_raises_on_typo(self):
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shape = FlatBookShape(id=self.book.pk, title="Mistborn", is_published=True)
|
|
d = shape.diff()
|
|
with self.assertRaises(KeyError):
|
|
d.nested("chapterz")
|
|
|
|
def test_diff_strict_shows_valid_names(self):
|
|
shape = BookDetailShape(
|
|
id=self.book.pk, title="Mistborn", isbn="9780765311788",
|
|
page_count=541, is_published=True,
|
|
author=FlatAuthorShape(id=self.author.pk, name="Brandon Sanderson"),
|
|
chapters=[], tags=[],
|
|
)
|
|
d = shape.diff()
|
|
with self.assertRaises(AttributeError) as ctx:
|
|
_ = d.bogus
|
|
self.assertIn("chapters", str(ctx.exception))
|
|
|
|
# ── diff_many ──
|
|
|
|
def test_diff_many_single_query_for_existing(self):
|
|
items = [FlatBookShape(id=self.book.pk, title="Renamed", is_published=True)]
|
|
results = FlatBookShape.diff_many(items)
|
|
self.assertEqual(len(results), 1)
|
|
_, d = results[0]
|
|
self.assertIn("title", d.changed)
|
|
|
|
def test_diff_many_mixed_new_and_existing(self):
|
|
items = [
|
|
FlatBookShape(id=self.book.pk, title="Mistborn", is_published=True),
|
|
FlatBookShape(id=None, title="New Book", is_published=False),
|
|
]
|
|
results = FlatBookShape.diff_many(items)
|
|
new = [d for _, d in results if d.is_new]
|
|
existing = [d for _, d in results if not d.is_new]
|
|
self.assertEqual(len(new), 1)
|
|
self.assertEqual(len(existing), 1)
|
|
|
|
def test_diff_many_nonexistent_raises(self):
|
|
items = [FlatBookShape(id=999999, title="Ghost", is_published=False)]
|
|
with self.assertRaises(Book.DoesNotExist):
|
|
FlatBookShape.diff_many(items)
|
|
|
|
def test_diff_many_batched_query(self):
|
|
book2 = Book.objects.create(
|
|
title="Warbreaker", isbn="9780765320308",
|
|
page_count=592, is_published=True, author=self.author,
|
|
)
|
|
items = [
|
|
FlatBookShape(id=self.book.pk, title="Mistborn", is_published=True),
|
|
FlatBookShape(id=book2.pk, title="Warbreaker Updated", is_published=True),
|
|
]
|
|
with self.assertNumQueries(1):
|
|
FlatBookShape.diff_many(items)
|
|
|
|
def test_diff_many_empty(self):
|
|
self.assertEqual(FlatBookShape.diff_many([]), [])
|
|
|
|
|
|
# =============================================================================
|
|
# Edge cases
|
|
# =============================================================================
|
|
|
|
|
|
class TestEdgeCases(TestCase):
|
|
|
|
@classmethod
|
|
def setUpTestData(cls):
|
|
cls.publisher = Publisher.objects.create(name="Edge Cases Ltd", country="XX")
|
|
cls.author = Author.objects.create(
|
|
name="Edge Author", bio="", publisher=cls.publisher
|
|
)
|
|
|
|
def test_empty_table_returns_empty_list(self):
|
|
Tag.objects.all().delete()
|
|
results = TagShape.query()
|
|
self.assertEqual(results, [])
|
|
|
|
def test_empty_string_fields(self):
|
|
results = AuthorCardShape.query(lambda qs: qs.filter(pk=self.author.pk))
|
|
self.assertEqual(results[0].bio, "")
|
|
|
|
def test_boolean_false_is_not_missing(self):
|
|
book = Book.objects.create(
|
|
title="Unpublished", isbn="0000000000000",
|
|
page_count=0, is_published=False, author=self.author,
|
|
)
|
|
results = FlatBookShape.query(lambda qs: qs.filter(pk=book.pk))
|
|
self.assertIs(results[0].is_published, False)
|
|
|
|
def test_zero_integer_is_not_missing(self):
|
|
book = Book.objects.create(
|
|
title="Empty", isbn="0000000000001",
|
|
page_count=0, is_published=False, author=self.author,
|
|
)
|
|
results = BookCardShape.query(lambda qs: qs.filter(pk=book.pk))
|
|
self.assertEqual(results[0].page_count, 0)
|
|
|
|
def test_large_queryset(self):
|
|
books = [
|
|
Book(
|
|
title=f"Book {i}", isbn=f"{i:013d}",
|
|
page_count=i * 10, is_published=i % 2 == 0,
|
|
author=self.author,
|
|
)
|
|
for i in range(100)
|
|
]
|
|
Book.objects.bulk_create(books)
|
|
results = FlatBookShape.query(lambda qs: qs.filter(author=self.author))
|
|
self.assertGreaterEqual(len(results), 100)
|
|
|
|
def test_diff_on_boolean_change(self):
|
|
book = Book.objects.create(
|
|
title="Toggle", isbn="1111111111111",
|
|
page_count=100, is_published=False, author=self.author,
|
|
)
|
|
shape = FlatBookShape(id=book.pk, title="Toggle", is_published=True)
|
|
d = shape.diff()
|
|
self.assertIn("is_published", d.changed)
|
|
self.assertIs(d.changed["is_published"], True)
|
|
|
|
def test_diff_unchanged_returns_empty(self):
|
|
book = Book.objects.create(
|
|
title="Same", isbn="2222222222222",
|
|
page_count=200, is_published=True, author=self.author,
|
|
)
|
|
shape = FlatBookShape(id=book.pk, title="Same", is_published=True)
|
|
d = shape.diff()
|
|
self.assertEqual(d.changed, {})
|
|
self.assertFalse(d.is_new)
|