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devicehub-teal/ereuse_devicehub/db.py

47 lines
1.5 KiB
Python

import citext
from sqlalchemy import event
from sqlalchemy.dialects import postgresql
from sqlalchemy.sql import expression
from sqlalchemy_utils import view
from teal.db import SchemaSQLAlchemy
class SQLAlchemy(SchemaSQLAlchemy):
"""
Superuser must create the required extensions in the public
schema of the database, as it is in the `search_path`
defined in teal.
"""
# todo add here all types of columns used so we don't have to
# manually import them all the time
UUID = postgresql.UUID
CIText = citext.CIText
def drop_all(self, bind='__all__', app=None):
"""A faster nuke-like option to drop everything."""
self.drop_schema()
self.drop_schema(schema='common')
def create_view(name, selectable):
"""Creates a view.
This is an adaptation from sqlalchemy_utils.view. See
`the test on sqlalchemy-utils <https://github.com/kvesteri/
sqlalchemy-utils/blob/master/tests/test_views.py>`_ for an
example on how to use.
"""
table = view.create_table_from_selectable(name, selectable)
# We need to ensure views are created / destroyed before / after
# SchemaSQLAlchemy's listeners execute
# That is why insert=True in 'after_create'
event.listen(db.metadata, 'after_create', view.CreateView(name, selectable), insert=True)
event.listen(db.metadata, 'before_drop', view.DropView(name))
return table
db = SQLAlchemy(session_options={'autoflush': False})
f = db.func
exp = expression