TypeError when autoincrementing column in sqlalchemy

Question

I have the following table definition

class User(Base):
    __tablename__ = 'users'

    id = Column(Integer, primary_key=True, autoincrement=True)
    email = Column(String(256), unique=True)
    is_admin = Column(Boolean, nullable=False)

    def __init__(self, id, email, is_admin):
        self.id = id
        self.email = email
        self.is_admin = is_admin

When I add a user I only call it with two arguments because I would like the id to be autoincremented and hence not passed by my call:

u = User(email=email, is_admin=admin)

but I get the following error:

TypeError: __init__() missing 1 required positional argument

How do I define a primary_key column without the need to pass it as an argument?

Asked By: Sabina Orazem

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Source

Answer 1

You do not need this __init__ definition, inheriting from Base creates one for you, which accepts only keyword arguments, not positional which is causing the issue with missing id in your question.

class User(Base):
    __tablename__ = 'users'

    id = Column(Integer, primary_key=True, autoincrement=True)
    email = Column(String(256), unique=True)
    is_admin = Column(Boolean, nullable=False)

u = User(email=email, is_admin=admin)  # OK

Answered By: ljmc

TypeError when autoincrementing column in sqlalchemy

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