[laravel] Migration: Cannot add foreign key constraint

In my case, the issue was that the main table already had records in it and I was forcing the new column to not be NULL. So adding a ->nullable() to the new column did the trick. In the question's example would be something like this:

$table->integer('user_id')->unsigned()->nullable();

or:

$table->unsignedInteger('user_id')->nullable();

Hope this helps somebody!

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