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more doc work, try fix oracle CI
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doc/source/best_practices.rst

Whitespace-only changes.

doc/source/examples.rst

Lines changed: 17 additions & 16 deletions
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@@ -27,29 +27,30 @@ implement our style enumeration like so:
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.. code-block:: python
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import typing as t
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from django.db import models
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from django_enum import IntegerChoices, EnumField
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from enum_properties import p, s
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from django_enum import EnumField
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from enum_properties import IntEnumProperties, Symmetric
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class Map(models.Model):
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class MapBoxStyle(
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IntegerChoices,
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s('slug', case_fold=True),
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p('version')
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):
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class MapBoxStyle(IntEnumProperties):
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"""
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https://docs.mapbox.com/api/maps/styles/
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"""
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_symmetric_builtins_ = ['name', 'uri', 'label']
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_symmetric_builtins_ = ['name', 'uri']
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# name value label slug version
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STREETS = 1, 'Streets', 'streets', 11
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OUTDOORS = 2, 'Outdoors', 'outdoors', 11
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LIGHT = 3, 'Light', 'light', 10
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DARK = 4, 'Dark', 'dark', 10
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label: t.Annotated[str, Symmetric()]
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slug: t.Annotated[str, Symmetric(case_fold=True)]
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version: int
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# name value label slug version
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STREETS = 1, 'Streets', 'streets', 12
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OUTDOORS = 2, 'Outdoors', 'outdoors', 12
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LIGHT = 3, 'Light', 'light', 11
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DARK = 4, 'Dark', 'dark', 11
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SATELLITE = 5, 'Satellite', 'satellite', 9
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SATELLITE_STREETS = 6, 'Satellite Streets', 'satellite-streets', 11
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SATELLITE_STREETS = 6, 'Satellite Streets', 'satellite-streets', 12
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NAVIGATION_DAY = 7, 'Navigation Day', 'navigation-day', 1
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NAVIGATION_NIGHT = 8, 'Navigation Night', 'navigation-night', 1
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@@ -88,12 +89,12 @@ We can use our enumeration like so:
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map = Map.objects.create()
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map.style.uri == 'mapbox://styles/mapbox/streets-v11'
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assert map.style.uri == 'mapbox://styles/mapbox/streets-v11'
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# uri's are symmetric
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map.style = 'mapbox://styles/mapbox/light-v10'
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map.full_clean()
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assert map.style == Map.MapBoxStyle.LIGHT
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assert map.style is Map.MapBoxStyle.LIGHT
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assert map.style == 3
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assert map.style == 'light'
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doc/source/flag_enums.rst

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@@ -0,0 +1,11 @@
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.. include:: refs.rst
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.. _flags:
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======================
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Flag Enums (bit masks)
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======================
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Python Enum_ classes can also be used to represent
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`bit masks <https://en.wikipedia.org/wiki/Mask_(computing)>`_. These types inherit from the Flag_
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extension to Enum_. For example we can define a set of flags for a user's permissions:

doc/source/index.rst

Lines changed: 1 addition & 1 deletion
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@@ -7,7 +7,6 @@ Django Enum
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|MIT license| |Ruff| |PyPI version fury.io| |PyPI pyversions| |PyPi djversions| |PyPI status|
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|Documentation Status| |Code Cov| |Test Status|
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----
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|Postgres| |MySQL| |MariaDB| |SQLite| |Oracle|
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@@ -308,6 +307,7 @@ Please report bugs and discuss features on the
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:caption: Contents:
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usage
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flag_enums
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examples
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performance
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eccentric_enums

doc/source/performance.rst

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@@ -2,9 +2,9 @@
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.. _performance:
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5-
==========================
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Performance Considerations
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==========================
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===========
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Performance
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===========
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Enums
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=====
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Flags
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=====
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The typical flag-like data model is to use a separate boolean column for each
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flag. **Using a flag** ``EnumField`` **out performs boolean columns in both
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storage and query performance in all scenarios.**
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The usual advice for adding bit mask behavior to a database table is to add multiple boolean
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columns. These columns can be indexed together which can speed up certain kinds of queries.
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There is an obvious storage improvement when using a single column bit mask instead, but can
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we achieve better query performance as well? The following benchmarks compare storage and query
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performance between boolean columns and bit masks.
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**Using a flag** ``EnumField`` **out performs boolean columns in both
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storage and query performance in most scenarios.**
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.. note::
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@@ -45,7 +50,8 @@ storage and query performance in all scenarios.**
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tables with boolean columns have exactly the same mask values as the tables
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with bitmasks. 10 queries are performed and averaged at each check point.
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Each query generates a different random mask value to query and each table
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both boolean and bitmask are queried with the same mask value.
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both boolean and bitmask are queried with the same mask value. The benchmarks
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were run on an Apple M1 laptop with 16GB of RAM and a 1TB SSD.
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No Indexing
@@ -60,10 +66,10 @@ for each supported RDBMS. The oracle line shows extents which are allocated in
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.. figure:: plots/FlagSizeBenchmark.png
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:alt: Storage Efficiency improvement over boolean columns
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Storage efficiency improvement over boolean columns. The x-axis is the
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number of flags and the y-axis is the number of bytes saved per row by using
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a bitmask instead of a boolean column for each flag. The colored areas show
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the column type employed to store the bitmask given the number of flags.
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Storage efficiency improvement over boolean columns. The x-axis is the number of flags and the
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y-axis is the number of bytes saved per row by using a bitmask instead of a boolean column for
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each flag. The colored areas show the column type employed to store the bitmask given the number
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of flags.
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For example, using PostgreSQL a table with a 32-flag column will save ~25 bytes
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per row over an equivalent table with 32 boolean columns. *For a table with a

doc/source/reference.rst

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@@ -66,3 +66,21 @@ Serializer Fields
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:show-inheritance:
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:private-members:
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URLs
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----
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.. automodule:: django_enum.urls
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:members:
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:undoc-members:
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:show-inheritance:
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:private-members:
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utilities
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---------
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.. automodule:: django_enum.utils
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:members:
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:undoc-members:
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:show-inheritance:
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:private-members:

tests/test_flags.py

Lines changed: 7 additions & 1 deletion
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@@ -462,5 +462,11 @@ def test_extra_big_flags(self):
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self.assertTrue(obj.extra_big_neg is None)
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self.assertEqual(obj.extra_big_pos, 0)
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465-
self.assertEqual(obj, self.MODEL_CLASS.objects.get(extra_big_pos=0))
465+
if connection.vendor == "oracle":
466+
# TODO - possible to fix this?
467+
self.assertEqual(
468+
obj, self.MODEL_CLASS.objects.get(extra_big_pos__isnull=True)
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)
470+
else:
471+
self.assertEqual(obj, self.MODEL_CLASS.objects.get(extra_big_pos=0))
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self.assertEqual(obj, self.MODEL_CLASS.objects.get(extra_big_neg__isnull=True))

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