rubyonrailsin

how do I change the column in a table to allow null?

I have

change_column :docs, :orga, :null

in my migration file but I get an error:

Mysql::Error: You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to
use near 'null DEFAULT '' NOT NULL' at line 1: ALTER TABLE `docs`
CHANGE `orga` `orga null DEFAULT '' NOT NULL

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