[Solved] Given this repository method in Flask:def get_user_by_id(self, user_id): return User.query.filter_by(id=user_id).first()What will repo.get_user_by_id(5) return if no user with ID 5 exists? | Flask

Flask - Ecosystem and Patterns

Given this repository method in Flask:

def get_user_by_id(self, user_id):
    return User.query.filter_by(id=user_id).first()

What will repo.get_user_by_id(5) return if no user with ID 5 exists?

ANone

BRaises an exception

CAn empty list []

DA User object with id 5

Step-by-Step Solution

Solution:

Step 1: Understand SQLAlchemy filter_by().first() behavior
The first() method returns the first matching record or None if no match is found.
Step 2: Apply to user_id 5 with no matching user
Since no user with ID 5 exists, the method returns None, not a list or exception.
Final Answer:
None -> Option A
Quick Check:
filter_by().first() returns None if no match [OK]

Quick Trick: filter_by().first() returns None if no record found [OK]

Common Mistakes:

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