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使用db模型获取此错误。任何想法可能是什么问题?Python烧瓶上的外键
InvalidRequestError: When initializing mapper Mapper|Stand|stand, expression 'Stand.item_code_name==item_id' failed to locate a name ("name 'item_id' is not defined"). If this is a class name, consider adding this relationship() to the <class 'app.models.Stand'> class after both dependent classes have been defined.
class Stand(db.Model):
stand_id = db.Column(db.String(10), primary_key = True)
stand_name = db.Column(db.String(24), index = True, unique = True)
item_code_name =db.Column(db.String, db.ForeignKey('item_codes.item_id'))
item_codes= db.relationship('Item_codes', primaryjoin = "Stand.item_code_name==item_id")
class Item_codes(db.Model):
item_id = db.Column(db.String(10), primary_key = True)
item_name = db.Column(db.String(100), index = True, unique = True)
combi = db.Column(db.String(140))
请问清楚。 – emeth
您必须在声明主要联接的同时提及该模型。试试这个 - 'primaryjoin =“Stand.item_code_name == Item_codes.item_id”'。 – vivekagr