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Jassim Alhatem
20,883 PointsSomething wrong with sqlalchemy querying and filtering question?
I don't know what I'm doing wrong. I watched the video twice, read the docs and I'm still stuck. I'm stuck on task 1.
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
engine = create_engine(‘sqlite:///movies.db’, echo=False)
Session = sessionmaker(bind=engine)
session = Session()
Base = declarative_base()
class Movie(Base):
__tablename__ = ‘movies’
id = Column(Integer, primary_key=True)
movie_title = Column(String)
genre = Column(String)
# Write your code below
romance_movies = session.query(Movie).filter_by(Movie.genre=="romance")
for movie in romance_movies:
print(movie)
1 Answer
Chris Freeman
Treehouse Moderator 68,457 PointsYou are very close. The challenge checker wants genre= instead of Movie.genre==, and "Romance" instead of "romance"
Note the difference in the cases below (from the docs). One uses filter, the other uses filter_by:
# filtering results, which is accomplished either with filter_by(), which uses keyword arguments:
sql
>>> for name, in session.query(User.name).\
... filter_by(fullname='Ed Jones'):
... print(name)
ed
# …or filter(), which uses more flexible SQL expression language constructs.
# These allow you to use regular Python operators with the class-level attributes on your mapped class:
sql
>>> for name, in session.query(User.name).\
... filter(User.fullname=='Ed Jones'):
... print(name)
ed
Check back if you need more help. Good luck!!
Jassim Alhatem
20,883 PointsThank you so much, Chris, you're a lifesaver. I thought filter and fliter_by were the same because when the challenge returned an "error" the message said "use filter or filter_by" and I understood it as either of them.
Chris Freeman
Treehouse Moderator 68,457 PointsChris Freeman
Treehouse Moderator 68,457 PointsWhat I don't know is why the checker allows both
filterandfilter_byas found in the regexfilter[_by]*, but does not allow theMovie.genreformat allowed when usingfilter. Flagging for feedback from developers.