78 lines
2.6 KiB
Python
78 lines
2.6 KiB
Python
import citext
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from sqlalchemy import event
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from sqlalchemy.dialects import postgresql
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from sqlalchemy.orm import sessionmaker
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from sqlalchemy.sql import expression
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from sqlalchemy_utils import view
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from ereuse_devicehub.teal.db import SchemaSession, SchemaSQLAlchemy
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class DhSession(SchemaSession):
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def final_flush(self):
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"""A regular flush that performs expensive final operations
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through Devicehub (like saving searches), so it is thought
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to be used once in each request, at the very end before
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a commit.
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"""
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# This was done before with an ``before_commit`` sqlalchemy action
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# however it is too fragile –it does not detect previously-flushed
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# things
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# This solution makes this more aware to the user, although
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# has the same problem. This is not final solution.
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# todo a solution would be for this session to save, on every
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# flush, all the new / dirty interesting things in a variable
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# until DeviceSearch is executed
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from ereuse_devicehub.resources.device.search import DeviceSearch
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DeviceSearch.update_modified_devices(session=self)
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class SQLAlchemy(SchemaSQLAlchemy):
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"""Superuser must create the required extensions in the public
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schema of the database, as it is in the `search_path`
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defined in teal.
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"""
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# todo add here all types of columns used so we don't have to
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# manually import them all the time
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UUID = postgresql.UUID
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CIText = citext.CIText
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PSQL_INT_MAX = 2147483648
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def drop_all(self, bind='__all__', app=None, common_schema=True):
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"""A faster nuke-like option to drop everything."""
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self.drop_schema()
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if common_schema:
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self.drop_schema(schema='common')
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def create_session(self, options):
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return sessionmaker(class_=DhSession, db=self, **options)
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def create_view(name, selectable):
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"""Creates a view.
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This is an adaptation from sqlalchemy_utils.view. See
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`the test on sqlalchemy-utils <https://github.com/kvesteri/
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sqlalchemy-utils/blob/master/tests/test_views.py>`_ for an
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example on how to use.
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"""
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table = view.create_table_from_selectable(name, selectable)
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# We need to ensure views are created / destroyed before / after
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# SchemaSQLAlchemy's listeners execute
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# That is why insert=True in 'after_create'
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event.listen(
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db.metadata, 'after_create', view.CreateView(name, selectable), insert=True
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)
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event.listen(db.metadata, 'before_drop', view.DropView(name))
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return table
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db = SQLAlchemy(
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session_options={'autoflush': False},
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)
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f = db.func
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exp = expression
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