How can I remove unique column laravel 5 - laravel

How can I dropUnique the column a_b from z table?
If it would be just column a, we can do this:
$table->dropUnique('z_a_unique');
I've tried:
$table->dropUnique('z_a_b_unique');
But obviously it didn't work.
Thanks for your help in advance!


dropUnqiue() will drop index, not the column. You need to use dropColumn() after dropUnique():
$table->dropColumn('a_b');


Actually, the answer is in the question, sorry guys, it works like this:
$table->dropUnique('z_a_b_unique');
And solved my problem

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