????(Scaffolding)

?????? ?????

????? ???? ??? ?????? ?? ??????? ?? ??? ? ????. ???? ???? ??? ??? ????:

• ??? ??
• ??/??/??/??(CRUD)? ???? ????

???? ?? ??

????? ???? ?? ??? ??? "scaffold" ??? ?? ????. "Book" ??? ???? ?? ????? ????? ????? "scaffold"?? ??? ??? ?? true? ???? ???:

class BookController {
   def scaffold = true
}

def scaffold = Author.class

• list
• show
• edit
• delete
• create
• save
• update

??? ??? Java? ??? ?? ??? ????? ??? ??? ??? ??? ? ?? "scaffold" ??? ???? ????? ???.

?? ????

Grails? ???? ??? ?? ???? ???? ?? ??? ??? ??? ??? ????? ?? ??? ???? ?????? ??? ??? ??? ?? ????. ?? ?? ?? ????? ???? ??? changeAuthor ???? ?? ????? ?? ???? show ???? ?????? ?? ????:

class BookController {
   def scaffold = Book.class
   def changeAuthor = {
        def b = Book.get( params["id"] )
        b.author = Auhtor.get( params["author.id"] )
        b.save()
        // redirect to a scaffolded action
        redirect(action:show)
   }
}

class BookController {
   def scaffold = Book.class
   // over rides scaffolded action to return both authors and books
   def list = {
         [ "books" : Book.list(), "authors": Author.list() ]
   }
}

????? ? ????

???? ??? ?? ???? ??? ?? ????? ??? ?? ??? ??? ????. ??? ??? ??? Grails??? ????? ????? ?? ??? ???? ??? ?????. ????? ????? ????? ?? ??? ?????:

grails generate-controller

grails generate-views

grails generate-all

??? ?? ?????? ??

Grails? ?? ???? ?? ??? ????? ??? ? ????. ?? ?? ??? ??? ???? ??? ???? ??? constrains ???? ??? ??? ???? ?? ???:

def constraints = {
      title()
      releaseDate()
}

def constraints = {
      title()
      category(inList:["Fiction", "Non-fiction", "Biography"])
      releaseDate()
}

def constraints = {
        age(range:18..65)
}

def constraints = {
        name(length:0..30)
}

def constraints = {
        description(widget:'textarea')
}

??? ????

??? ??? Java? ???? ?? Hibernate? ???? ?? ???? ??? Grails? ???? ????? ??? ? ????. ? ??? ???? Grails? Hibernate ??? ??? ??? ?????? ?? GORM ? ?? ?? ???? ???????. ?? ??? ??, Hibernate? ??? ?? ??? ???? ?? ????? ??? ?? ?????? ?? ???? ?????? ?? ???:

import com.books.HibernateBook
class BookController {
     def scaffold = HibernateBook.class
}

Grails? ?? ????? ???? ?? ?????? ????? ??? ????? ????? ??? ??? ?? ??(naming convention)? ??? "Constaints"? ??? ??? Groovy ????? ?????. ?? ?? ??? ??? "HibernateBook" ???? ?? "com/books/HibernateBookConstraints.groovy" ????? HibernateBook ???? ?? ???? ?????. ???? ???? GORM?? ? ? ?? constraints? ????? ???. ? ? ??? ?? @Property? ?? ????:

constraints = {
      title(length:5..15)
      desc(blank:false)
}