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Python Using Databases in Python Meet Peewee Queries Are Your Friend

Jeremy Kerrigan
Jeremy Kerrigan
12,002 Points

If I change the number of points for a username, it doesn't update my database to the highest points holder.

The database holds onto the highest points holder when I created the database. When I created the database jeremy was the highest points holder. Then I changed my list of dictionaries to have steve have the highest points total. Though the database still says jeremy is the highest points holder. I saved the file and restarted the console as well. Still no fix. Thanks

from peewee import *

db = SqliteDatabase('students.db')

class Student(Model):
    username = CharField(max_length=255, unique=True)
    points = IntegerField(default=0)

    class Meta:
        database = db

students = [
   {'username': 'jeremy',
    'points': 1400},
    {'username': 'matt',
    'points': 11912},
    {'username': 'kevin',
     'points': 7363},
    {'username': 'annie',
     'points': 4079},
    {'username': 'steve',
     'points': 14717}
]        

def add_students():
    for student in students:
        try:
            Student.create(username = student['username'],
                          points = student['points'])
        except IntegrityError:
            student_record = Student.get(username = student['username'])
            student_record_points = student['points']
            student_record.save()

def top_student():
    student = Student.select().order_by(Student.points.desc()).get()
    return student

if __name__ == '__main__':
    db.connect()
    db.create_tables([Student], safe=True)
    add_students()
    print("Our top student right now is: {0.username}.".format(top_student()))

treehouse:~/workspace$ python students.py
Our top student right now is: jeremy.
treehouse:~/workspace$

treehouse:~/workspace$ python students.py
Our top student right now is: jeremy.
treehouse:~/workspace

1 Answer

Seth Kroger
Seth Kroger
56,412 Points

When the student record already exists and you are trying to update the points you're assigning to student_record_points which is creating a new variable, not updating the points property in the Student object. You should use student_record.points instead.

        except IntegrityError:
            student_record = Student.get(username = student['username'])
            student_record.points = student['points']
            student_record.save()
Jeremy Kerrigan
Jeremy Kerrigan
12,002 Points

Ohh my gosh. Thanks soo much Seth Kroger