query level delete and update

tests/test_queryset_level_methods.py

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+import databases
+import pytest
+import sqlalchemy
+
+import ormar
+from ormar.exceptions import QueryDefinitionError
+from tests.settings import DATABASE_URL
+
+database = databases.Database(DATABASE_URL, force_rollback=True)
+metadata = sqlalchemy.MetaData()
+
+
+class Book(ormar.Model):
+    class Meta:
+        tablename = "books"
+        metadata = metadata
+        database = database
+
+    id: ormar.Integer(primary_key=True)
+    title: ormar.String(max_length=200)
+    author: ormar.String(max_length=100)
+    genre: ormar.String(max_length=100, default='Fiction', choices=['Fiction', 'Adventure', 'Historic', 'Fantasy'])
+
+
+@pytest.fixture(autouse=True, scope="module")
+def create_test_database():
+    engine = sqlalchemy.create_engine(DATABASE_URL)
+    metadata.drop_all(engine)
+    metadata.create_all(engine)
+    yield
+    metadata.drop_all(engine)
+
+
+@pytest.mark.asyncio
+async def test_delete_and_update():
+    async with database:
+        async with database.transaction(force_rollback=True):
+            await Book.objects.create(title='Tom Sawyer', author="Twain, Mark", genre='Adventure')
+            await Book.objects.create(title='War and Peace', author="Tolstoy, Leo", genre='Fiction')
+            await Book.objects.create(title='Anna Karenina', author="Tolstoy, Leo", genre='Fiction')
+            await Book.objects.create(title='Harry Potter', author="Rowling, J.K.", genre='Fantasy')
+            await Book.objects.create(title='Lord of the Rings', author="Tolkien, J.R.", genre='Fantasy')
+
+            all_books = await Book.objects.all()
+            assert len(all_books) == 5
+
+            await Book.objects.filter(author="Tolstoy, Leo").update(author="Lenin, Vladimir")
+            all_books = await Book.objects.filter(author="Lenin, Vladimir").all()
+            assert len(all_books) == 2
+
+            historic_books = await Book.objects.filter(genre='Historic').all()
+            assert len(historic_books) == 0
+
+            with pytest.raises(QueryDefinitionError):
+                await Book.objects.update(genre='Historic')
+
+            await Book.objects.filter(author="Lenin, Vladimir").update(genre='Historic')
+
+            historic_books = await Book.objects.filter(genre='Historic').all()
+            assert len(historic_books) == 2
+
+            await Book.objects.delete(genre='Fantasy')
+            all_books = await Book.objects.all()
+            assert len(all_books) == 3
+
+            await Book.objects.update(each=True, genre='Fiction')
+            all_books = await Book.objects.filter(genre='Fiction').all()
+            assert len(all_books) == 3
+
+            with pytest.raises(QueryDefinitionError):
+                await Book.objects.delete()
+
+            await Book.objects.delete(each=True)
+            all_books = await Book.objects.all()
+            assert len(all_books) == 0