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Python Using Databases in Python Gettin' CRUD-y With It CRUD: Search Function

Y B
Y B
14,136 Points
Posted by Y B
Y B
14,136 Points

peewee multiple where filters

I can't get past the peewee challenge where it asks for multiple where filters. I'm not sure of the syntax - so that may be causing the issue?

crud.py 
from models import Challenge


def create_challenge(name, language, steps=1):
    Challenge.create(name=name,
                     language=language,
                     steps=steps)

def search_challenges(name, language):
    Challenge.select().where(name==name, language==language)
Y B
Y B
14,136 Points
Y B
Y B
14,136 Points

The challenge question is: Create a function named search_challenges that takes two arguments, name and language. Return all Challenges where the name field contains name argument and the language field is equal to the language argument. Use == for equality. You don't need boolean and or binary & for this, just put both conditions in your where().

1 Answer

Y B
Y B
14,136 Points
Y B
Y B
14,136 Points

The answer from the next challenge provided the answer, but I'm not exactly sure why this works. Specifically what is Challenge.language==language doing?

def search_challenges(name, language):
    return Challenge.select().where(
        Challenge.name.contains(name),
        Challenge.language==language
    )
Dan Johnson
Dan Johnson
40,532 Points
Dan Johnson
Dan Johnson
40,532 Points

The field objects of peewee have overloaded the equality operator and they return a peewee.Expression instead of a boolean. I assume these are used to assemble the actual query.