a, thank you so much for your detail explaination anthony. it's work fine 
now by add :

db.category.parent.requires=IS_IN_DB(db, 'category.category')

btw, with this, i still have a problem for input the parent category. 
because in form there is not allowed to put an empty value. i have 2 ideas 
for this problem :
1. put the parent category directly to database via database input command
2. create the root category above parent category :
for example
root category
|
parent category
| 
child category

do you have better idea or suggestion about this?

thanks a lot before

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