guarillamail:

I have a working blog system. I want to add it to comment system. I completed migrations with post model with id, title and body.

Now I add comments and create new model named Comment. When I run migrations:

INFO [alembic.runtime.migration] Context impl MySQLImpl.

INFO [alembic.runtime.migration] Will assume non-transactional DDL.

INFO [alembic.env] No changes in schema detected.

from run import db

class Post(db.Model):
    __tablename__ = 'blog.post'
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String, nullable=False)
    body = db.Column(db.Text, nullable=False)

    comments = db.relationship('Comment', backref='blog.post')


from run import db


class Comment(db.Model):   
    __tablename__ = 'blog.comment'
    id = db.Column(db.Integer, primary_key=True)
    body = db.Column(db.Text, nullable=False)

    post_id = db.Column(db.Integer, db.ForeignKey('blog.post.id'), nullable=False)

I dont know what is wrong with my code. I get relationship from documentation and edit it. There aren't any comment table in db before.