Today I wanted to add some functionality to my Blog and fill in the tests, however, the first step in creating a test database would not pass, so I tried to solve the problem.
When running . / test, a database is first created for testing, and that's when I ran into a problem:
ValueError: Related model '' cannot be resolved
This error means that the Model in question cannot be resolved.
Then because . / test didn't print out any other useful information at all, and I didn't know where the error was occurring, I came up with the idea of trying to manually create a database, called test, and migrate it:
./ migrate --database test
Once I ran it, I finally got detailed output and located the specific Migration that was in error. it turned out to be a Model dependency for one of my Apps, but I couldn't find it. What is the reason for this?
I tried to move the order of telegrambot to the front in the INSTALLED_APPS, but that didn't work either. So I had to enable *.
It turns out that my dependencies for Migration for that App didn't depend on telegrambot, so naturally I wouldn't look for it.
So took the original, added a line for dependency, and tried . / test, problem solved.
class Migration():
dependencies = [
+ ('telegrambot', '0001_initial'),
('powernews', '0004_applenews'),
]
To summarize: Some command line tools will not have much useful output when they execute errors, so you can try to perform some operations manually.
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