Re: [Django] #31019: The database backend specific checks could be bypassed when using multiple databases with one empty default database.

[Django]

#31019: The database backend specific checks could be bypassed when using 
multiple
databases with one empty default database.
-------------------------------------+-------------------------------------
     Reporter:  Shipeng Feng         |                    Owner:  nobody
         Type:  Bug                  |                   Status:  new
    Component:  Core (System         |                  Version:  master
  checks)                            |
     Severity:  Normal               |               Resolution:
     Keywords:                       |             Triage Stage:
                                     |  Unreviewed
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------
Description changed by Shipeng Feng:

Old description:

> Here is the settings:
>
> {{{
> #!python
> DATABASES = {
>     'default': {},
>     'users': {
>         'NAME': 'user_data',
>         'ENGINE': 'django.db.backends.mysql',
>         'USER': 'mysql_user',
>         'PASSWORD': 'superS3cret'
>     },
>     'customers': {
>         'NAME': 'customer_data',
>         'ENGINE': 'django.db.backends.mysql',
>         'USER': 'mysql_cust',
>         'PASSWORD': 'veryPriv@ate'
>     }
> }
> }}}
>
> Here is the related source code:
> https://github.com/django/django/blob/f97a6123c07de5099fdf8b7d00ef7d20ed354e07/django/db/models/fields/__init__.py#L340
>
> We only run checks for the first db, and the behavior of the first is
> undetermined (the first entry of a dictionary),
> if the first db is `default`, then we would only run dummy backend
> checks, mysql checks are bypassed.

New description:

 Here is the settings:

 {{{
 #!python
 DATABASES = {
     'default': {},
     'users': {
         'NAME': 'user_data',
         'ENGINE': 'django.db.backends.mysql',
         'USER': 'mysql_user',
         'PASSWORD': 'superS3cret'
     },
 }
 }}}

 Here is the related source code:
 
https://github.com/django/django/blob/f97a6123c07de5099fdf8b7d00ef7d20ed354e07/django/db/models/fields/__init__.py#L340

 We only run checks for the first db, and the behavior of the first is
 undetermined (the first entry of a dictionary),
 if the first db is `default`, then we would only run dummy backend checks,
 mysql checks are bypassed.

--

-- 
Ticket URL: <https://code.djangoproject.com/ticket/31019#comment:1>
Django <https://code.djangoproject.com/>
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