Let's say you've just installed symposion for the first time, and
you're running the intial `./manage.py migrate`
In that circumstance, there isn't an auth_group table. Naturally this
means you get Some Errors when trying to look for a particular group.
This change handles that error and drives on.
Borrowed from the pyconau-2017 fork
To explain the impact of this - without this patch, if a user has
their invoice refunded, they are able to buy a new ticket; but
t-shirts, dinner tickets and so on do not become available to them
again because they are listed has already been in a cart for them.
Applying the patch now correctly checks to see if they currently have
a ticket.
From 731eee0a4c42a5013ee312b1ff50548e4d89a2ff Mon Sep 17 00:00:00 2001
From: Richard Jones <r1chardj0n3s@gmail.com>
Date: Sun, 4 Jun 2017 13:22:34 +1000
Subject: [PATCH] Fix query modification so that conditions are combined
Previously it was checking if the user has a product from the category
in a cart, and if there is no cart that is released (refunded).
Not *if the user has a product in a cart that is not released*.
This patch combines them. In the absence of a __ne operation in the
joining syntax, a double equality check is needed.
Signed-off-by: Richard Jones <r1chardj0n3s@gmail.com>
So django keeps strict synchronization between its code and migrations
so that it can help generating new migrations. These are the additional
suggested migrations. A lot of these are a null effect, some are things
like transforming an unsigned integer to a signed integer. So not super
urgent on a small scale, but worth doing to keep django happy.
