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test_ltree.py
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test_ltree.py
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import pytest
from django.db import IntegrityError
from demo.categories.models import Category
pytestmark = pytest.mark.django_db
def test_create_category():
category = Category.objects.create(name='Foo', code='bar')
# we need to do a full refresh to get the value of the path
category.refresh_from_db()
assert category.id > 0
assert category.name == 'Foo'
assert category.code == 'bar'
assert category.path == 'bar'
def test_direct_children():
top = Category.objects.create(code='top')
science = Category.objects.create(code='science', parent=top)
sport = Category.objects.create(code='sport', parent=top)
news = Category.objects.create(code='news', parent=top)
Category.objects.create(code='politics', parent=news)
# we can acess direct children using the `children` property
assert list(top.children.order_by('code')) == [news, science, sport]
def test_descendants():
top = Category.objects.create(code='top')
top.refresh_from_db()
science = Category.objects.create(code='science', parent=top)
Category.objects.create(code='maths', parent=science)
biology = Category.objects.create(code='biology', parent=science)
Category.objects.create(code='genetics', parent=biology)
Category.objects.create(code='neuroscience', parent=biology)
sport = Category.objects.create(code='sport', parent=top)
Category.objects.create(code='rugby', parent=sport)
football = Category.objects.create(code='football', parent=sport)
Category.objects.create(code='champions_league', parent=football)
Category.objects.create(code='world_cup', parent=football)
# we can get all the ancestors of a category (including itself)
assert list(
Category.objects
.filter(path__descendant=top.path)
.values_list('path', flat=True)
.order_by('path')
) == [
'top',
'top.science',
'top.science.biology',
'top.science.biology.genetics',
'top.science.biology.neuroscience',
'top.science.maths',
'top.sport',
'top.sport.football',
'top.sport.football.champions_league',
'top.sport.football.world_cup',
'top.sport.rugby',
]
def test_ancestors():
top = Category.objects.create(code='top')
top.refresh_from_db()
Category.objects.create(code='sport', parent=top)
science = Category.objects.create(code='science', parent=top)
Category.objects.create(code='maths', parent=science)
biology = Category.objects.create(code='biology', parent=science)
Category.objects.create(code='genetics', parent=biology)
neuroscience = Category.objects.create(code='neuroscience', parent=biology)
neuroscience.refresh_from_db()
# we can get all the ancestors of a category (including itself)
assert list(
Category.objects
.filter(path__ancestor=neuroscience.path)
.values_list('path', flat=True)
.order_by('path')
) == [
'top',
'top.science',
'top.science.biology',
'top.science.biology.neuroscience',
]
def test_update_code():
top = Category.objects.create(code='top')
top.refresh_from_db()
Category.objects.create(code='sport', parent=top)
science = Category.objects.create(code='science', parent=top)
biology = Category.objects.create(code='biology', parent=science)
Category.objects.create(code='genetics', parent=biology)
Category.objects.create(code='neuroscience', parent=biology)
# update the code of a category, it should update its path as well as
# the path of all of its descendants
science.code = 'magic'
science.save()
assert list(
Category.objects
.filter(path__descendant=top.path)
.values_list('path', flat=True)
.order_by('path')
) == [
'top',
'top.magic',
'top.magic.biology',
'top.magic.biology.genetics',
'top.magic.biology.neuroscience',
'top.sport',
]
def test_update_parent():
top = Category.objects.create(code='top')
top.refresh_from_db()
Category.objects.create(code='sport', parent=top)
science = Category.objects.create(code='science', parent=top)
biology = Category.objects.create(code='biology', parent=science)
Category.objects.create(code='genetics', parent=biology)
Category.objects.create(code='neuroscience', parent=biology)
# update the parent of a category, it should update its path as well as
# the path of all of its descendants
biology.parent = top
biology.save()
assert list(
Category.objects
.filter(path__descendant=top.path)
.values_list('path', flat=True)
.order_by('path')
) == [
'top',
'top.biology',
'top.biology.genetics',
'top.biology.neuroscience',
'top.science',
'top.sport',
]
def test_simple_recursion():
foo = Category.objects.create(code='foo')
# we cannot be our own parent...
foo.parent = foo
with pytest.raises(IntegrityError):
foo.save()
def test_nested_recursion():
foo = Category.objects.create(code='foo')
bar = Category.objects.create(code='bar', parent=foo)
baz = Category.objects.create(code='baz', parent=bar)
# we cannot be the descendant of one of our parent
foo.parent = baz
with pytest.raises(IntegrityError):
foo.save()