Question

Edit I found the answer and it’s not related to how the model is setup. I was trying to pass the request.form from flask to a function that actually creates the address. Apparently converting that to kwargs causes a problem. Manually specifying each of the arguments made everything work correctly.

I’m new to SQLAlchemy and things have been going pretty well so far but I’ve hit a problem and I’m completely stumped so I’m hoping someone here knows what i’m doing wrong!

I have an address model and i’m trying to select from it. The model looks like this:

class Address(Base):
    __tablename__ = 'address'

    id = Column(Integer, primary_key=True)
    comment = Column(String(255))
    address1 = Column(String(100))
    address2 = Column(String(100))
    city = Column(String(45))
    state = Column(String(2))
    zip = Column(String(5))
    zip4 = Column(String(4))
    lat = Column(Float)
    lon = Column(Float)

I’m trying to match elements of an address entered through my application to see if I can find the lat and longitude without geocoding. I’ve used filter_by in other queries that worked so I am trying the same thing here: (the address dict comes from post parameters to my application)

matched_address = session.query(Address).filter_by(
    address1=address['address1'],
    city=address['city'],
    state=address['state'],
    zip=address['zip']
).one()

Unfortunately this is failing with a SQL Error:

ProgrammingError: (ProgrammingError) (1064, 'You have an error in your SQL syntax; 
check the manual that corresponds to your MySQL server version for the right 
syntax to use near \') AND address.state = ("\'XX\'",) AND address.zip = 
("\'XXXXX\'",) AND address.city \' at line 3')

This looks very very ugly! Where are the extra () come from? I turned on echo=True in my call to create_engine() and it prints a query that seems correct (I tried it in the mysql client with no problems):

SELECT address.id AS address_id, address.comment AS address_comment, 
    address.address1 AS address_address1, address.address2 AS address_address2, 
    address.city AS address_city, address.state AS address_state, 
    address.zip AS address_zip, address.zip4 AS address_zip4, 
    address.lat AS address_lat, address.lon AS address_lon 
FROM address 
WHERE address.address1 = %s AND address.state = %s AND address.zip = %s AND 
    address.city = %s 
LIMIT %s

But the parameters it says it’s outputting seems a little odd, though I’m not sure if this is just the python object or if it’s really going to MySQL this way: (note the X characters are just replacements for my real address)

([u'1111 XXXXXX St'], [u'XX'], [u'XXXXX'], [u'XXXXX'], 1)

Just for fun I tried using filter() instead of filter_by() but I get the same errors:

matched_address = database.session.query(Address).filter(
    and_(Address.address1==address['address1'], Address.city==address['city'],    
    Address.state==address['state'],Address.zip==address['zip'])).one()

Sorry if this is a basic question. Thanks in advance for any help!

Answer 1

I found the answer and it’s not related to how the model is setup. I was trying to pass the request.form from flask to a function that actually creates the address. Apparently converting that to kwargs causes a problem. Manually specifying each of the arguments made everything work correctly.