On Thu, Jul 20, 2017 at 1:34 PM, Jinghui Niu <niujing...@gmail.com> wrote:
> I've been studying sqlalchemy's self referential table. I've read the
> documentation many times and still have difficulties understanding the
> concept of remote_side. Could someone please draw a diagram or use an
> analogy to help explain this concept? I think visualizing is a better way
> but anything helps would be appreciated. Thanks.
>
>
> By the way, in my opinion the word remote is a little vague, as it can be
> interpreted from different angles. Like the word left and rigt, it really
> depends on which direction you are facing, my right could be your left.
it's more specific than "left" and "right", because if you have:
Node.relationship(remote_side=something) -> Node
the "remote_side" refers specifically to the columns that are not
local to the Node that has the .relationship.
That is:
Node.col1
Node.col2
Node.relationship:
name='foo'
local_side=Node.col1
remote_side=Node.col2
You then know that:
query(Node).join(Node.foo, aliased=True)
will emit the equivalent of:
SELECT * FROM node JOIN node AS node_remote ON node.col1 = node_remote.col2
I'm
> not really confident in this but I would guess chaing the name from
> remote_side to many_side may help? Correct me if I'm wrong here.
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> 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 description.
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