I'm assuming you want if
@admin.save then a render or
#correct,i assuming here i want input data to db with defference name.
#means:if i have field name with value "cow" on db, i not want not have
two "cow" name on table Box,because that i use @n as checker,are there
name with 'cow'.'quotes'(i want make sign up with manual but here i
assuming def create as login for my ask today).
What you're looking for is probably uniqueness check, either at model
level (validates_uniqueness_of) and/or database (unique index).
Here, @n will always be true because you have:
@n = Box.where(name: params[:name])
which always return trueish value even when there's no result. You need
either call `take` or use `find_by` instead or do it properly as I wrote
#i am using hp,i hope you understand that has give.
( my english less)
Try learning English (for example, using https://id.duolingo.com/ ).