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import pytest
import sqlalchemy as sa
import sqlalchemy.orm
from sqlalchemy_utils import (
create_materialized_view,
create_view,
refresh_materialized_view
)
from sqlalchemy_utils.compat import _select_args
from sqlalchemy_utils.view import CreateView
@pytest.fixture
def Article(Base, User):
class Article(Base):
__tablename__ = 'article'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.String(128))
author_id = sa.Column(sa.Integer, sa.ForeignKey(User.id))
author = sa.orm.relationship(User)
return Article
@pytest.fixture
def User(Base):
class User(Base):
__tablename__ = 'user'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.String(128))
return User
@pytest.fixture
def ArticleMV(Base, Article, User):
class ArticleMV(Base):
__table__ = create_materialized_view(
name='article-mv',
selectable=sa.select(
*_select_args(
Article.id,
Article.name,
User.id.label('author_id'),
User.name.label('author_name'),
)
).select_from(
Article.__table__.join(User, Article.author_id == User.id)
),
aliases={'name': 'article_name'},
metadata=Base.metadata,
indexes=[sa.Index('article-mv_id_idx', 'id')]
)
return ArticleMV
@pytest.fixture
def ArticleView(Base, Article, User):
class ArticleView(Base):
__table__ = create_view(
name='article-view',
selectable=sa.select(
*_select_args(
Article.id,
Article.name,
User.id.label('author_id'),
User.name.label('author_name'),
)
).select_from(
Article.__table__.join(User, Article.author_id == User.id)
),
metadata=Base.metadata
)
return ArticleView
@pytest.fixture
def init_models(ArticleMV, ArticleView):
pass
@pytest.mark.usefixtures('postgresql_dsn')
class TestMaterializedViews:
def test_refresh_materialized_view(
self,
session,
Article,
User,
ArticleMV
):
article = Article(
name='Some article',
author=User(name='Some user')
)
session.add(article)
session.commit()
refresh_materialized_view(session, 'article-mv')
materialized = session.query(ArticleMV).first()
assert materialized.article_name == 'Some article'
assert materialized.author_name == 'Some user'
def test_querying_view(
self,
session,
Article,
User,
ArticleView
):
article = Article(
name='Some article',
author=User(name='Some user')
)
session.add(article)
session.commit()
row = session.query(ArticleView).first()
assert row.name == 'Some article'
assert row.author_name == 'Some user'
class TrivialViewTestCases:
def life_cycle(
self,
engine,
metadata,
column,
cascade_on_drop,
replace=False,
):
create_view(
name='trivial_view',
selectable=sa.select(*_select_args(column)),
metadata=metadata,
cascade_on_drop=cascade_on_drop,
replace=replace,
)
metadata.create_all(engine)
metadata.drop_all(engine)
class SupportsCascade(TrivialViewTestCases):
def test_life_cycle_cascade(
self,
connection,
engine,
Base,
User
):
self.life_cycle(engine, Base.metadata, User.id, cascade_on_drop=True)
class DoesntSupportCascade(SupportsCascade):
@pytest.mark.xfail
def test_life_cycle_cascade(self, *args, **kwargs):
super().test_life_cycle_cascade(
*args,
**kwargs
)
class SupportsNoCascade(TrivialViewTestCases):
def test_life_cycle_no_cascade(
self,
connection,
engine,
Base,
User
):
self.life_cycle(engine, Base.metadata, User.id, cascade_on_drop=False)
class SupportsReplace(TrivialViewTestCases):
def test_life_cycle_replace(
self,
connection,
engine,
Base,
User
):
self.life_cycle(
engine,
Base.metadata,
User.id,
cascade_on_drop=False,
replace=True,
)
def test_life_cycle_replace_existing(
self,
connection,
engine,
Base,
User
):
create_view(
name='trivial_view',
selectable=sa.select(*_select_args(User.id)),
metadata=Base.metadata,
)
Base.metadata.create_all(engine)
view = CreateView(
name='trivial_view',
selectable=sa.select(*_select_args(User.id)),
replace=True,
)
with connection.begin():
connection.execute(view)
Base.metadata.drop_all(engine)
def test_replace_materialized(
self,
connection,
engine,
Base,
User
):
with pytest.raises(ValueError):
CreateView(
name='trivial_view',
selectable=sa.select(*_select_args(User.id)),
materialized=True,
replace=True,
)
@pytest.mark.usefixtures('postgresql_dsn')
class TestPostgresTrivialView(SupportsCascade, SupportsNoCascade, SupportsReplace):
pass
@pytest.mark.usefixtures('mysql_dsn')
class TestMySqlTrivialView(SupportsCascade, SupportsNoCascade, SupportsReplace):
pass
@pytest.mark.usefixtures('sqlite_none_database_dsn')
class TestSqliteTrivialView(DoesntSupportCascade, SupportsNoCascade):
pass
|
