Laravel Foreign Key can't find Primary Key of another table through constrained() if id is named manually

Question

So. I have searched for this problem in depth and haven't found a solution, but I solved it by mistake.

table users:

$table->id('user_id'); // I want it to be named like that specifically let's say I'm a maniac.

table whatever:

$table->foreignId('user_id')->constrained('users');

//now this should work, but it doesn't, the error seems to be that it is looking in "users" table for id instead of user_id.

What I've done is this: constrained('users', 'user_id')

//now I can't seem to find any documentation on this, to know exactly if it's OK, but it works.

I want to add that I'm a novice in programming, so the question is, is this ok to leave like this? or should I do it the old way: ->references('user_id')->on('users') ?