def update_field_value():
Blog.objects.create(name=' '.join(fake.words(2)))
with count_queries():
blog = Blog.objects.get()
blog.likes = blog.likes + 1
blog.save()
def related_object_count__annotation():
create_blog_posts(300)
with count_queries():
for author in Author.objects.annotate(
blogpost_count=Count('blogpost')):
print(author.name, '||', author.blogpost_count)
def reuse_querysets():
create_blog_posts(1)
with count_queries():
if Blog.objects.all():
print('There are blogs!')
for blog in Blog.objects.all():
print(blog.name)
def reuse_querysets__reuse():
create_blog_posts(1)
with count_queries():
blogs = Blog.objects.all()
if blogs:
print('There are blogs!')
for blog in blogs:
print(blog.name)
def following_reverse_fk():
create_blog_posts(300)
with count_queries():
for author in Author.objects.all():
print(author.name)
for blog_post in author.blogpost_set.all():
print(blog_post.title, '||', blog_post.blog.name)
def bulk_create():
blog = Blog.objects.create(name=' '.join(fake.words(2)))
author = Author.objects.create(name=fake.name())
with count_queries():
for x in range(300):
BlogPost.objects.create(
title=' '.join(fake.words(5)),
blog=blog,
author=author,
)
def following_reverse_fk__prefetch_related__select_related():
create_blog_posts(300)
with count_queries():
authors = Author.objects.prefetch_related(
Prefetch(
'blogpost_set',
queryset=BlogPost.objects.select_related('blog'),
))
for author in authors:
print(author.name)
for blog_post in author.blogpost_set.all():
print(blog_post.title, '||', blog_post.blog.name)
def following_m2m__prefetch_related():
create_blog_posts(300)
with count_queries():
for blog_post in BlogPost.objects.prefetch_related('tags'):
print(', '.join((tag.name for tag in blog_post.tags.all())))
def following_foreignkeys__large__select_related():
create_blog_posts(300)
with count_queries():
for blog_post in BlogPost.objects.select_related('author'):
print(blog_post.author.name)
def following_foreignkeys__large():
create_blog_posts(300)
with count_queries():
for blog_post in BlogPost.objects.all():
print(blog_post.author.name)
def following_foreignkeys__small__select_related():
create_blog_posts(1)
with count_queries():
blog_post = BlogPost.objects.select_related('author').get()
print(blog_post.author.name)
def update_field_value__f():
blog = Blog.objects.create(name=' '.join(fake.words(2)))
with count_queries():
Blog.objects.filter(id=blog.id, ).update(likes=F('likes') + 1, )
def related_object_count():
create_blog_posts(300)
with count_queries():
for author in Author.objects.all():
print(author.name, '||', author.blogpost_set.count())
