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About "create" method

 
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Greeting all:
Thank you for all help. I just get some troubles that I misunderstand something.
My document about booking a hotel� room, that a field was named �Customer holding this record�. The comment said that: The id value of the customer who has booked this. If this field is all blanks, the record is available for sale.
If I want to coding create method that either I creating a new record to the database or update the �Customer holding this record� field, it�s mean some customer booking this room.
Well, how can I choice it, dear friends, please help me.
 
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