PeeWee：忽略外键约束

Question

Job.select().where(Job.user == current_user.id and Job.status == "Running")

Keeps returning the wrong row from the wrong user. It seems to ignore the statement Job.user == current_user.id altogether.

I also tried

Job.select().join(User).where(Job.status == "Running")

same thing, it won't return the correct Job belonging to the current user.

Answer 1

The problem here is that and doesn't translate to SQL AND .

In fact, it can't do anything like that, in any library. The and operator can't be overloaded, it short-circuits (doesn't evaluate the second argument) if the first isn't truthy, and it always returns the last thing it evaluated.

So, since Job.user == current_user.id returns a non-empty query object, which is truthy, Job.user == current_user.id and Job.status == "Running" returns Job.status == "Running" . Which is why it's ignoring the current_user.id .

Use the & operator, or the bin_and method, as the docs say.

Also, remember that & doesn't have the same precedence as and , so you will need parens around each comparison.

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As for your second attempt, that join works fine—it just means that each row in Job is joined up with the columns from the corresponding row in User . You haven't even tried to tell it what user you want restrict it to, and it can't read your mind.