On Fri, Mar 22, 2019 at 10:53 AM Konstantin Naumov <naumo...@gmail.com> wrote: > > Great, thank you! > > I thought that I can use a field of relationship() - “invited_by" in User > model for emitting the similar query, but I'm getting an empty list.
take a look at SQL being emitted with echo=True > > > On Mar 20, 2019, at 12:55 AM, Mike Bayer <mike...@zzzcomputing.com> wrote: > > On Tue, Mar 19, 2019 at 10:23 AM kosta <naumo...@gmail.com> wrote: > > > Hello Mike, > Thank you for your response! > > > First of all, I'm apologize, I have lack knowledge in sql. I guess my SQL > should be as: > Get all users invited by specific user: > > SELECT u.name AS "sender", i.name AS "invitee" > FROM invitation inv > LEFT JOIN user u ON inv.sender_id=u.id > LEFT JOIN user i ON inv.invitee_id=i.id > WHERE inv.sender_id=?; > > Get user who invited specific user: > > SELECT u.name AS "invited_by", i.name AS "invitee" > FROM invitation inv > LEFT JOIN user u ON inv.sender_id=u.id > LEFT JOIN user i ON inv.invitee_id=i.id > WHERE inv.invitee_id=?; > > > here's the form of the first one and the second is basically the same idea: > > from sqlalchemy.orm import aliased > > u = aliased(User, "u") > i = aliased(User, "i") > > q = session.query( > u.name.label("sender"), > i.name.label("invitee") > ).select_from(Invitation).\ > outerjoin(u, Invitation.sender).\ > outerjoin(i, Invitation.invitee).\ > filter(Invitation.sender_id=5) > > > > понедельник, 18 марта 2019 г., 17:48:26 UTC+3 пользователь Mike Bayer написал: > > > On Sat, Mar 16, 2019 at 9:33 AM kosta <naum...@gmail.com> wrote: > > > Hello everyone! > > I've designed invitation model > class User(Base): > __tablename__ = 'user' > > id = Column(Integer, primary_key=True) > name = Column(String(64)) > email = Column(String(64)) > class Invitation(Base): > __tablename__ = 'invitation' > > id = Column(Integer, primary_key=True) > sender_id = Column(Integer, ForeignKey('user.id')) > invitee_id = Column(Integer, ForeignKey('user.id'), unique=True) > sender = relationship('User', foreign_keys=[sender_id], backref='invite_list') > invitee = relationship('User', foreign_keys=[invitee_id], > backref='invited_by', uselist=False) > > email = Column(String) > phone = Column(String) > token = Column(String) > > My logic is: > > 1. Create a new record in Invitation table: sender_id - current user, email > or phone and unique generated token. > 2. Create a new record in User table keep received token, commit it. > 3. Find a record in Invitation table by filter token and update filed > invitee_id == new_user.id > > > My problem is backref return value for invited_by - return (of course) > Invitation record. > My question is whether I've possibility return for invited_by User record via > Invitation table or not? > > > you can find any record via anything, what SQL would you like to emit please ? > > > > > > -- > SQLAlchemy - > The Python SQL Toolkit and Object Relational Mapper > > http://www.sqlalchemy.org/ > > To post example code, please provide an MCVE: Minimal, Complete, and > Verifiable Example. 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