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django prefetch_related vs select_related

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notorious answered on May 12, 2021 Popularity 10/10 Helpfulness 4/10

answer django prefetch_related vs select_related

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related django select_related and prefetch_related

django prefetch_related vs select_related

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class ModelA(models.Model):
    pass

class ModelB(models.Model):
    a = ForeignKey(ModelA)

ModelB.objects.select_related('a').all() # Forward ForeignKey relationship
ModelA.objects.prefetch_related('modelb_set').all() # Reverse ForeignKey relationship

Popularity 10/10 Helpfulness 4/10 Language python

Source: stackoverflow.com

Tags: django python

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Contributed on Sep 07 2022

notorious

0 Answers Avg Quality 2/10

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django select_related and prefetch_related

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* django select_related and prefetch_related
* Prefetch_related and select_related functions in django
---------------------------------
select_related() “follows” foreign-key relationships,
selecting additional related-object data when it executes its query.

prefetch_related() does a separate lookup for each relationship, 
and does the “joining” in Python.
-------------------
Example

class A(models.Model):
pass

class B(models.Model):
a = ForeignKey(ModelA)
# Forward ForeignKey relationship
A.objects.select_related('a').all()
# Reverse ForeignKey relationship
A.objects.prefetch_related('modelb_set').all()

Popularity 10/10 Helpfulness 3/10 Language python

Source: www.geeksforgeeks.org

Tags: django dj

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Contributed on Apr 08 2022

ASHABB

0 Answers Avg Quality 2/10

prefetch_related list django

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# Use the magic syntax with "*" to expand the list
Knight.objects.all().prefetch_related(*selected_attributes)

Popularity 10/10 Helpfulness 2/10 Language python

Source: stackoverflow.com

Tags: django dj

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Contributed on Aug 11 2021

Thankful Teira

0 Answers Avg Quality 2/10

django select_related and prefetch_related

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django select_related and prefetch_related

select_related >> foreignkey
prefetch_related >> many to many
basically they are performance boosters ,used to avoid multiple unnecessary queries
Both methods achieve the same purpose, to forego unnecessary db queries. 
But they use different approaches for efficiency..

Popularity 10/10 Helpfulness 1/10 Language python

Source: Grepper

Tags: django dj

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Contributed on May 12 2021

Evil Eel

0 Answers Avg Quality 2/10

django prefetch_related vs select_related

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