You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
107 lines
3.7 KiB
107 lines
3.7 KiB
from __future__ import annotations
|
|
|
|
import typing as t
|
|
|
|
import sqlalchemy as sa
|
|
import sqlalchemy.exc
|
|
import sqlalchemy.orm
|
|
from flask import abort
|
|
|
|
from .pagination import Pagination
|
|
from .pagination import QueryPagination
|
|
|
|
|
|
class Query(sa.orm.Query): # type: ignore[type-arg]
|
|
"""SQLAlchemy :class:`~sqlalchemy.orm.query.Query` subclass with some extra methods
|
|
useful for querying in a web application.
|
|
|
|
This is the default query class for :attr:`.Model.query`.
|
|
|
|
.. versionchanged:: 3.0
|
|
Renamed to ``Query`` from ``BaseQuery``.
|
|
"""
|
|
|
|
def get_or_404(self, ident: t.Any, description: str | None = None) -> t.Any:
|
|
"""Like :meth:`~sqlalchemy.orm.Query.get` but aborts with a ``404 Not Found``
|
|
error instead of returning ``None``.
|
|
|
|
:param ident: The primary key to query.
|
|
:param description: A custom message to show on the error page.
|
|
"""
|
|
rv = self.get(ident)
|
|
|
|
if rv is None:
|
|
abort(404, description=description)
|
|
|
|
return rv
|
|
|
|
def first_or_404(self, description: str | None = None) -> t.Any:
|
|
"""Like :meth:`~sqlalchemy.orm.Query.first` but aborts with a ``404 Not Found``
|
|
error instead of returning ``None``.
|
|
|
|
:param description: A custom message to show on the error page.
|
|
"""
|
|
rv = self.first()
|
|
|
|
if rv is None:
|
|
abort(404, description=description)
|
|
|
|
return rv
|
|
|
|
def one_or_404(self, description: str | None = None) -> t.Any:
|
|
"""Like :meth:`~sqlalchemy.orm.Query.one` but aborts with a ``404 Not Found``
|
|
error instead of raising ``NoResultFound`` or ``MultipleResultsFound``.
|
|
|
|
:param description: A custom message to show on the error page.
|
|
|
|
.. versionadded:: 3.0
|
|
"""
|
|
try:
|
|
return self.one()
|
|
except (sa.exc.NoResultFound, sa.exc.MultipleResultsFound):
|
|
abort(404, description=description)
|
|
|
|
def paginate(
|
|
self,
|
|
*,
|
|
page: int | None = None,
|
|
per_page: int | None = None,
|
|
max_per_page: int | None = None,
|
|
error_out: bool = True,
|
|
count: bool = True,
|
|
) -> Pagination:
|
|
"""Apply an offset and limit to the query based on the current page and number
|
|
of items per page, returning a :class:`.Pagination` object.
|
|
|
|
:param page: The current page, used to calculate the offset. Defaults to the
|
|
``page`` query arg during a request, or 1 otherwise.
|
|
:param per_page: The maximum number of items on a page, used to calculate the
|
|
offset and limit. Defaults to the ``per_page`` query arg during a request,
|
|
or 20 otherwise.
|
|
:param max_per_page: The maximum allowed value for ``per_page``, to limit a
|
|
user-provided value. Use ``None`` for no limit. Defaults to 100.
|
|
:param error_out: Abort with a ``404 Not Found`` error if no items are returned
|
|
and ``page`` is not 1, or if ``page`` or ``per_page`` is less than 1, or if
|
|
either are not ints.
|
|
:param count: Calculate the total number of values by issuing an extra count
|
|
query. For very complex queries this may be inaccurate or slow, so it can be
|
|
disabled and set manually if necessary.
|
|
|
|
.. versionchanged:: 3.0
|
|
All parameters are keyword-only.
|
|
|
|
.. versionchanged:: 3.0
|
|
The ``count`` query is more efficient.
|
|
|
|
.. versionchanged:: 3.0
|
|
``max_per_page`` defaults to 100.
|
|
"""
|
|
return QueryPagination(
|
|
query=self,
|
|
page=page,
|
|
per_page=per_page,
|
|
max_per_page=max_per_page,
|
|
error_out=error_out,
|
|
count=count,
|
|
)
|