Thank you very much, Jonathan Vanasco. I have not considered backrefs, I
will take a look.
but, Is there a way to not use backref but directly used these edges
(edge_1 and edge_2) to get node_1 and node_3?
On Wednesday, February 7, 2018 at 1:42:26 PM UTC-6, Jonathan Vanasco wrote:
>
> actually
actually, you'd be constraining the join against the edge elements since
the base is a node. (edge is the more common name for your usage/link)
if you're searching for node2, then you'd constrain the query by joining
the edge items like this:
result = session.query(node_2)\
.join(edge_1, node
What is the efficient way to generalize such joins, If I am parsing a graph
and get the joins dynamically?
On Wednesday, February 7, 2018 at 1:09:42 PM UTC-6, madhusud...@gmail.com
wrote:
>
> Thank you, Could you elaborate on how would I "constrain the selection
> with joins to node1 and node3
Thank you, Could you elaborate on how would I "constrain the selection with
joins to node1 and node3"?
I am still not clear on that part.
On Wednesday, February 7, 2018 at 12:57:59 PM UTC-6, Jonathan Vanasco wrote:
>
> I do a lot with graphs in SqlAlchemy, and I think you'd have a easier time
>
I do a lot with graphs in SqlAlchemy, and I think you'd have a easier time
writing these queries if you flipped your search so that you're querying a
single identified object.
For example, on use-case-1, you can query for the "Usage", and join the
nodes.
> result = session.query(Usage)\
> .joi
Hi Mike,
I am creating a graph structure using the ORM below and am able to do
inserts.
Base = declarative_base()
class Link(Base):
__tablename__ = 'base_link'
_constraints = ['first_id', 'second_id']
__table_args__ = (UniqueConstraint(*_constraints, name =
'link_constraint'), {"schema":"my_
On Wed, Feb 7, 2018 at 6:01 AM, Jeremy Flowers
wrote:
> Hi
> I've recently used sqlacodegen
>
> When I try and run against the generated code it get this message that I've
> been unable to fix:
>
> Could not determine join condition between parent/child tables on
> relationship Workgrp.usrmst - t
On Wed, Feb 7, 2018 at 7:16 AM, tonthon wrote:
> Hi,
>
> I'd like to setup bidirectionnal data synchornization between the lastname
> attribute of two related models
>
> class User(Base):
> __tablename__ = 'users'
> id = Column(Integer, primary_key=True)
> lastname = Column(String(50))
>
Hallo everyone,
I am trying to run all the pytest of sqlalchemy. But I always get the error
- SQLAlchemy requires Mock as of version 0.8.2. I already have the mock
library installed. Could somebody please help me to solve the problem.
Thanks in advance,
Greetings,
S
--
SQLAlchemy -
The Pyt
Thank you Mike.
I'll try that :-) I'll keep you informed.
--
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 ful
Hello Gaston,
In deed, there is no mistakes in my example. That was just here in order to
illustrate my explanations.
I tried to reproduce the problem, without success. If the problem is
vicious, I could spend a huge amount of time trying to reproduce it.
This is why I have thought It could b
On Feb 7, 2018 6:09 AM, "Sven" wrote:
Hello everybody,
Today, I have a strange problem regarding relationships.
My project contains already several relationships and until now, I never
had any problem with these. But now, when I try to add a new relationship
between two classes, the entire prog
Hi,
There's nothing that could cause the problem you describe in the example
you provide maybe the guilty lines where not included.
The easier way to go should be to step by step reproduce your model
structure until you face the problem you describe and then post an
example code : http://stackov
Hi,
When SQALchemy can't guess the join condition to use for a relationship,
you have to use the primaryjoin parameter :
ursmst = relationship('Usrmst',
primaryjoin="Workgrp.workgrp_owner==Usrmst.id")
Hope this helps.
Regards
Gaston
Le 07/02/2018 à 12:01, Jeremy Flowers a écrit :
> Hi
> I've
Hi,
I'd like to setup bidirectionnal data synchornization between the
lastname attribute of two related models
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
lastname = Column(String(50))
userdatas = relationship('UserDatas',
primaryjoin='User.id=
Hello everybody,
Today, I have a strange problem regarding relationships.
My project contains already several relationships and until now, I never
had any problem with these. But now, when I try to add a new relationship
between two classes, the entire program suddenly crashes without displayin
Hi
I've recently used sqlacodegen
When I try and run against the generated code it get this message that
I've been unable to fix:
Could not determine join condition between parent/child tables on
relationship Workgrp.usrmst - there are multiple foreign key paths linking
the tables. Specify th
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