Many to many using Flask-SQLAlchemy returns raw sql instead of executed
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28-05-2021 - |
Вопрос
Im using the python framework flask with sqlalchemy.
My many-to-many looks like this:
collections_questions = db.Table('collections_questions',
db.Column('question_id',db.Integer,db.ForeignKey('question.id')),
db.Column('collection_id',db.Integer,db.ForeignKey('collection.id'))
)
class Collection(db.Model):
id = db.Column(db.Integer,primary_key=True)
title = db.Column(db.String)
lang = db.Column(db.Integer)
questions = db.relationship('Question',secondary=collections_questions,backref=db.backref('collections'),lazy='dynamic')
def __init__(self,title,lang=0):
self.title = title
self.lang = lang
class Question(db.Model):
id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.String)
question = db.Column(db.String)
lang = db.Column(db.Integer)
type = db.Column(db.Integer)
def __init__(self,title,question,lang=0,type=0):
self.title = title
self.question = question
self.lang = lang
self.type = type
Now if i do
collection = db.session.query(Collection).get(1)
collection.questions does not return a list of questions, instead it returns the following query.
SELECT question.id AS question_id, question.title AS question_title, question.question AS question_question, question.lang AS question_lang, question.type AS question_type
FROM question, collections_questions
WHERE :param_1 = collections_questions.collection_id AND question.id = collections_questions.question_id
Any help would be greatly apprecieted!
Thanks
Решение
you're using lazy="dynamic", so collection.questions is a Query object. You need to iterate over it to emit SQL and get the contents:
list(collection.questions)
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