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[英]Flask-SQLAlchemy: get column in parent table as child model attribute by one-to-many relationship
[英]Set an attribute inside the model of a one-to-many relationship in SQLAlchemy
我正在嘗試在父 model(文章)中設置關系屬性並返回 RelevantFlag 的最新 object。 Articles 和 RelevantFlag 模型是一對多的關系,因此我的模型如下所示:
class Article(db.Model):
id = db.Column(db.Integer, primary_key=True)
relevant_flag = db.relationship(
'RelevantFlag',
backref="Article",
lazy='dynamic'
)
# Get the latest RelevantFlag model object
def getLatestRelevance(self):
return Article.query.join(
RelevantFlag
).filter(
RelevantFlag.id == self.id
).order_by(
Article.id.desc()
).first()
def setRelevance(self, state):
# Set the boolean to what's passed in 'state'
def __repr__(self):
return '<Article {}>'.format(self.id)
class RelevantFlag(db.Model):
id = db.Column(db.Integer, primary_key=True)
article_id = db.Column(db.Integer, db.ForeignKey('article.id'))
state = db.Column(db.Boolean)
我的問題是,我如何編寫一個設置器來更改文章 model 內的 RelevantFlag 的 state 屬性?
如果我理解正確,您想通過訪問一對多關系來更改列值?
def setRelevance(self, state):
# Set the boolean to what's passed in 'state'
self.relevant_flag.state = state
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