mirrors/django
1
0
Fork 0
mirror of https://github.com/django/django.git synced 2025-10-24 06:06:09 +00:00
Code Issues 32 Releases Wiki Activity

Fixed #34140 -- Reformatted code blocks in docs with blacken-docs.

Browse Source
This commit is contained in:
django-bot
2023-02-28 20:53:28 +01:00
committed by Mariusz Felisiak
parent 6015bab80e
commit 14459f80ee
193 changed files with 5797 additions and 4481 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
docs/ref/contrib/postgres/constraints.txt
View File

@@ -47,9 +47,9 @@ second element is an SQL operator represented as a string. To avoid typos, you
may use :class:`~django.contrib.postgres.fields.RangeOperators` which maps the
operators with strings. For example::
expressions=[
('timespan', RangeOperators.ADJACENT_TO),
(F('room'), RangeOperators.EQUAL),
expressions = [
("timespan", RangeOperators.ADJACENT_TO),
(F("room"), RangeOperators.EQUAL),
]
.. admonition:: Restrictions on operators.
@@ -60,8 +60,8 @@ The :class:`OpClass() <django.contrib.postgres.indexes.OpClass>` expression can
be used to specify a custom `operator class`_ for the constraint expressions.
For example::
expressions=[
(OpClass('circle', name='circle_ops'), RangeOperators.OVERLAPS),
expressions = [
(OpClass("circle", name="circle_ops"), RangeOperators.OVERLAPS),
]
creates an exclusion constraint on ``circle`` using ``circle_ops``.
@@ -103,9 +103,9 @@ are ``Deferrable.DEFERRED`` or ``Deferrable.IMMEDIATE``. For example::
ExclusionConstraint(
name='exclude_overlapping_deferred',
name="exclude_overlapping_deferred",
expressions=[
('timespan', RangeOperators.OVERLAPS),
("timespan", RangeOperators.OVERLAPS),
],
deferrable=Deferrable.DEFERRED,
)
@@ -161,22 +161,23 @@ taking canceled reservations into account::
from django.db import models
from django.db.models import Q
class Room(models.Model):
number = models.IntegerField()
class Reservation(models.Model):
room = models.ForeignKey('Room', on_delete=models.CASCADE)
room = models.ForeignKey("Room", on_delete=models.CASCADE)
timespan = DateTimeRangeField()
cancelled = models.BooleanField(default=False)
class Meta:
constraints = [
ExclusionConstraint(
name='exclude_overlapping_reservations',
name="exclude_overlapping_reservations",
expressions=[
('timespan', RangeOperators.OVERLAPS),
('room', RangeOperators.EQUAL),
("timespan", RangeOperators.OVERLAPS),
("room", RangeOperators.EQUAL),
],
condition=Q(cancelled=False),
),
@@ -202,12 +203,12 @@ current/rangetypes.html#RANGETYPES-INCLUSIVITY>`_. For example::
class TsTzRange(Func):
function = 'TSTZRANGE'
function = "TSTZRANGE"
output_field = DateTimeRangeField()
class Reservation(models.Model):
room = models.ForeignKey('Room', on_delete=models.CASCADE)
room = models.ForeignKey("Room", on_delete=models.CASCADE)
start = models.DateTimeField()
end = models.DateTimeField()
cancelled = models.BooleanField(default=False)
@@ -215,10 +216,13 @@ current/rangetypes.html#RANGETYPES-INCLUSIVITY>`_. For example::
class Meta:
constraints = [
ExclusionConstraint(
name='exclude_overlapping_reservations',
name="exclude_overlapping_reservations",
expressions=[
(TsTzRange('start', 'end', RangeBoundary()), RangeOperators.OVERLAPS),
('room', RangeOperators.EQUAL),
(
TsTzRange("start", "end", RangeBoundary()),
RangeOperators.OVERLAPS,
),
("room", RangeOperators.EQUAL),
],
condition=Q(cancelled=False),
),