init() got an unexpected keyword argument 'author' for one to many

Question

So, im trying to reference a users post ? and i keep getting this error

error

>>> from app import db, models
>>> u = models.User.query.get(2)
>>> p = models.Post(title='barn owl', body='thompson', author=u)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: __init__() got an unexpected keyword argument 'author'

I’m trying to reference posts by users.

Models.py

from app import app, db, bcrypt, slugify, flask_whooshalchemy, JWT, jwt_required, current_identity, safe_str_cmp
from sqlalchemy import Column, Integer, DateTime, func
from app import (TimedJSONWebSignatureSerializer
                          as Serializer, BadSignature, SignatureExpired)

import datetime


class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True)
    password = db.Column(db.String(20), unique=True)
    posts = db.relationship('Post', backref='author', lazy='dynamic')
    
    def __init__(self, username, password):
        self.username = username
        self.password = bcrypt.generate_password_hash(password, 9)
    
    def is_authenticated(self):
        return True
    
    def is_active(self):
        return True
        
    def is_anonymous(self):
        return False
        
    def get_id(self):
        return  (self.id)
        
    def __repr__(self):
        return '<User %r>' % self.username

    
class Post(db.Model):
    __tablename__ = "posts"
            
    id = db.Column(db.Integer,  primary_key=True)
    title = db.Column(db.String(80))
    body = db.Column(db.Text)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    # slug = db.Column(db.String(80), index=True, nullable=True)
    
    time_created = Column(DateTime(timezone=True), server_default=func.now())
    time_updated = Column(DateTime(timezone=True), onupdate=func.now())
                    
    def __init__(self, title, body):
        self.title = title
        self.body = body

        # self.slug = slugify(title).lower()

I’m pretty confused, i have been referencing the flask mega tutorial im not really having success, does anyone have any suggestions, im about to go nuts

Asked By: BARNOWL

||

Source

Answer 1

What you need is:

p = models.Post(title='barn owl', body='thompson', user_id=u.id)
#                                                  ^^^^^^^ ^ ^^

And as Kyle mentioned, add the user_id argument to the __init__ of Post:

def __init__(self, title, body, user_id):
    ...
    self.body = body
    self.user_id = user_id
    ...

Because your post contains a user_id, not an author:

class Post(db.Model):
    ...
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    ...

and your user has an id:

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    ...

Answered By: Bahrom

Answer 2

Or just add author as a relationship and add author as a parameter to the __init__ method

# inside Post definition
author = db.relationship("User")

def __init__(self,title,body,author):
    self.author = author

Answered By: Kyle Roux

init() got an unexpected keyword argument 'author' for one to many

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__init__() got an unexpected keyword argument 'author' for one to many

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init() got an unexpected keyword argument 'author' for one to many