[Solved] What is wrong with this Django query?books = Book.objects.select_related('publisher').all()Assuming Book has no publisher foreign key field. | Django

Django - Caching

What is wrong with this Django query?

books = Book.objects.select_related('publisher').all()

Assuming Book has no publisher foreign key field.

AIt will run but ignore the 'publisher' argument

BIt will raise a FieldError because 'publisher' is not a valid related field

CIt will fetch all books and publishers anyway

DIt will cause a syntax error

Step-by-Step Solution

Solution:

Step 1: Check if 'publisher' is a related field on Book
Since Book has no publisher foreign key, this field does not exist.
Step 2: Understand select_related behavior with invalid fields
Using an invalid field name in select_related raises a FieldError.
Final Answer:
It will raise a FieldError because 'publisher' is not a valid related field -> Option B
Quick Check:
Invalid field in select_related = FieldError = B [OK]

Quick Trick: Check related field names exist before using select_related [OK]

Common Mistakes:

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