Difference between null: false and required: true in rails -

in rails migrations difference between null: false , required: true?

for eg. if write:

t.string      :phone_number,      required: true

is same as:

t.string      :phone_number,      null: false

if both different how differ?

thanks in advance:)

required:true doesn't in migrations. perhaps getting confused active record validations?

tl;dr: use null:false.

O9