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

Posted by Ngqabutho Moyo
Ngqabutho Moyo
2,538 Points

How do I use the 'where' clause?

How do I design my query if 'Challenge' has no attribute 'where' (i.e. Challenge.where() is giving a syntax error)

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):
    search = Challenge.select()
    return search where(name==name, language==language)

1 Answer

Megan Amendola
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STAFF
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Megan Amendola
Treehouse Teacher
Megan Amendola
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Megan Amendola
Treehouse Teacher

At about 6:54 in the video before is where he talks about .where().

.where() can either attached on to the end of Challenge.select().where(logic here) or since you hade it a variable, you can use the variable search.where(logic here).

Here are some examples from the documentation as well: http://docs.peewee-orm.com/en/latest/peewee/querying.html#filtering-records

Ngqabutho Moyo
Ngqabutho Moyo
2,538 Points

I've corrected my query (I used 'return Challenge.select().where(Challenge.name==name, Challenge.language==language)') but the error states that the line did not return the correct number of records

Megan Amendola
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Megan Amendola
Treehouse Teacher
Megan Amendola
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Megan Amendola
Treehouse Teacher

The challenge is asking for where the name field contains name argument. Right now you are checking for when the field is equal == to the name argument. Call .contains(name) on Challenge.name to check if it contains the name argument instead.