72 lines
2.6 KiB
Python
72 lines
2.6 KiB
Python
import citext
|
||
from sqlalchemy import event
|
||
from sqlalchemy.dialects import postgresql
|
||
from sqlalchemy.orm import sessionmaker
|
||
from sqlalchemy.sql import expression
|
||
from sqlalchemy_utils import view
|
||
from teal.db import SchemaSQLAlchemy, SchemaSession
|
||
|
||
|
||
class DhSession(SchemaSession):
|
||
def final_flush(self):
|
||
"""A regular flush that performs expensive final operations
|
||
through Devicehub (like saving searches), so it is thought
|
||
to be used once in each request, at the very end before
|
||
a commit.
|
||
"""
|
||
# This was done before with an ``before_commit`` sqlalchemy action
|
||
# however it is too fragile –it does not detect previously-flushed
|
||
# things
|
||
# This solution makes this more aware to the user, although
|
||
# has the same problem. This is not final solution.
|
||
# todo a solution would be for this session to save, on every
|
||
# flush, all the new / dirty interesting things in a variable
|
||
# until DeviceSearch is executed
|
||
from ereuse_devicehub.resources.device.search import DeviceSearch
|
||
DeviceSearch.update_modified_devices(session=self)
|
||
|
||
|
||
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
|
||
PSQL_INT_MAX = 2147483648
|
||
|
||
def drop_all(self, bind='__all__', app=None, common_schema=True):
|
||
"""A faster nuke-like option to drop everything."""
|
||
self.drop_schema()
|
||
if common_schema:
|
||
self.drop_schema(schema='common')
|
||
|
||
def create_session(self, options):
|
||
return sessionmaker(class_=DhSession, db=self, **options)
|
||
|
||
|
||
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
|