234 lines
7.7 KiB
Python
234 lines
7.7 KiB
Python
import asyncio
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from typing import List, Union, Optional
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import databases
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import pytest
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import sqlalchemy
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import ormar
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from ormar.exceptions import ModelPersistenceError, NoMatch, RelationshipInstanceError
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from tests.settings import DATABASE_URL
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database = databases.Database(DATABASE_URL, force_rollback=True)
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metadata = sqlalchemy.MetaData()
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class Author(ormar.Model):
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class Meta:
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tablename = "authors"
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database = database
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metadata = metadata
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id: int = ormar.Integer(primary_key=True)
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first_name: str = ormar.String(max_length=80)
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last_name: str = ormar.String(max_length=80)
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class Category(ormar.Model):
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class Meta:
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tablename = "categories"
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database = database
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metadata = metadata
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id: int = ormar.Integer(primary_key=True)
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name: str = ormar.String(max_length=40)
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class PostCategory(ormar.Model):
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class Meta:
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tablename = "posts_categories"
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database = database
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metadata = metadata
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class Post(ormar.Model):
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class Meta:
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tablename = "posts"
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database = database
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metadata = metadata
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id: int = ormar.Integer(primary_key=True)
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title: str = ormar.String(max_length=200)
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categories: Optional[Union[Category, List[Category]]] = ormar.ManyToMany(
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Category, through=PostCategory
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)
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author: Optional[Author] = ormar.ForeignKey(Author)
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@pytest.fixture(scope="module")
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def event_loop():
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loop = asyncio.get_event_loop()
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yield loop
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loop.close()
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@pytest.fixture(autouse=True, scope="module")
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async def create_test_database():
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engine = sqlalchemy.create_engine(DATABASE_URL)
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metadata.create_all(engine)
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yield
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metadata.drop_all(engine)
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@pytest.fixture(scope="function")
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async def cleanup():
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yield
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async with database:
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await PostCategory.objects.delete(each=True)
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await Post.objects.delete(each=True)
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await Category.objects.delete(each=True)
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await Author.objects.delete(each=True)
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@pytest.mark.asyncio
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async def test_not_saved_raises_error(cleanup):
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async with database:
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guido = await Author(first_name="Guido", last_name="Van Rossum").save()
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post = await Post.objects.create(title="Hello, M2M", author=guido)
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news = Category(name="News")
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with pytest.raises(ModelPersistenceError):
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await post.categories.add(news)
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@pytest.mark.asyncio
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async def test_assigning_related_objects(cleanup):
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async with database:
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guido = await Author.objects.create(first_name="Guido", last_name="Van Rossum")
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post = await Post.objects.create(title="Hello, M2M", author=guido)
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news = await Category.objects.create(name="News")
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# Add a category to a post.
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await post.categories.add(news)
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# or from the other end:
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await news.posts.add(post)
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# Creating columns object from instance:
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await post.categories.create(name="Tips")
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assert len(post.categories) == 2
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post_categories = await post.categories.all()
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assert len(post_categories) == 2
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@pytest.mark.asyncio
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async def test_quering_of_the_m2m_models(cleanup):
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async with database:
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# orm can do this already.
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guido = await Author.objects.create(first_name="Guido", last_name="Van Rossum")
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post = await Post.objects.create(title="Hello, M2M", author=guido)
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news = await Category.objects.create(name="News")
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# tl;dr: `post.categories` exposes the QuerySet API.
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await post.categories.add(news)
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post_categories = await post.categories.all()
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assert len(post_categories) == 1
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assert news == await post.categories.get(name="News")
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num_posts = await news.posts.count()
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assert num_posts == 1
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posts_about_m2m = await news.posts.filter(title__contains="M2M").all()
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assert len(posts_about_m2m) == 1
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assert posts_about_m2m[0] == post
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posts_about_python = await Post.objects.filter(categories__name="python").all()
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assert len(posts_about_python) == 0
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# Traversal of relationships: which categories has Guido contributed to?
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category = await Category.objects.filter(posts__author=guido).get()
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assert category == news
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# or:
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category2 = await Category.objects.filter(
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posts__author__first_name="Guido"
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).get()
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assert category2 == news
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@pytest.mark.asyncio
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async def test_removal_of_the_relations(cleanup):
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async with database:
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guido = await Author.objects.create(first_name="Guido", last_name="Van Rossum")
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post = await Post.objects.create(title="Hello, M2M", author=guido)
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news = await Category.objects.create(name="News")
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await post.categories.add(news)
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assert len(await post.categories.all()) == 1
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await post.categories.remove(news)
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assert len(await post.categories.all()) == 0
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# or:
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await news.posts.add(post)
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assert len(await news.posts.all()) == 1
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await news.posts.remove(post)
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assert len(await news.posts.all()) == 0
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# Remove all columns objects:
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await post.categories.add(news)
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await post.categories.clear()
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assert len(await post.categories.all()) == 0
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# post would also lose 'news' category when running:
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await post.categories.add(news)
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await news.delete()
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assert len(await post.categories.all()) == 0
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@pytest.mark.asyncio
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async def test_selecting_related(cleanup):
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async with database:
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guido = await Author.objects.create(first_name="Guido", last_name="Van Rossum")
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post = await Post.objects.create(title="Hello, M2M", author=guido)
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news = await Category.objects.create(name="News")
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recent = await Category.objects.create(name="Recent")
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await post.categories.add(news)
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await post.categories.add(recent)
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assert len(await post.categories.all()) == 2
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# Loads categories and posts (2 queries) and perform the join in Python.
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categories = await Category.objects.select_related("posts").all()
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# No extra queries needed => no more `await`s required.
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for category in categories:
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assert category.posts[0] == post
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news_posts = await news.posts.select_related("author").all()
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assert news_posts[0].author == guido
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assert (await post.categories.limit(1).all())[0] == news
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assert (await post.categories.offset(1).limit(1).all())[0] == recent
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assert await post.categories.first() == news
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assert await post.categories.exists()
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@pytest.mark.asyncio
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async def test_selecting_related_fail_without_saving(cleanup):
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async with database:
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guido = await Author.objects.create(first_name="Guido", last_name="Van Rossum")
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post = Post(title="Hello, M2M", author=guido)
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with pytest.raises(RelationshipInstanceError):
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await post.categories.all()
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@pytest.mark.asyncio
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async def test_adding_unsaved_related(cleanup):
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async with database:
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guido = await Author.objects.create(first_name="Guido", last_name="Van Rossum")
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post = await Post.objects.create(title="Hello, M2M", author=guido)
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news = Category(name="News")
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with pytest.raises(ModelPersistenceError):
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await post.categories.add(news)
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await news.save()
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await post.categories.add(news)
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assert len(await post.categories.all()) == 1
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@pytest.mark.asyncio
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async def test_removing_unsaved_related(cleanup):
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async with database:
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guido = await Author.objects.create(first_name="Guido", last_name="Van Rossum")
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post = await Post.objects.create(title="Hello, M2M", author=guido)
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news = Category(name="News")
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with pytest.raises(NoMatch):
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await post.categories.remove(news)
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