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/
>
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>
> http://www.sqlalchemy.org/
>
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> --
> 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. See http://stackoverflow.com/help/mcve for a full
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> --
> 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. See http://stackoverflow.com/help/mcve for a full
> description.
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--
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
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