Restfull in grails

Restfull for Grails :

grails create-app RestFullTest
cd RestFullTest
grails create-domain-class book
grails create-controller Book


You can add some code this /grails-app/conf/BootStrap.groovy file:

def init = { servletContext ->
    new Book(author:"S.M. Mahmudul Hasan",title:"Grails").save()
    new Book(author:"Shohan",title:"Restfull").save()
}

or U can insert value in db
or U can insert by programatically

Final project structure will be:




















RESTful server
We need to create controller that will be performing base CRUD operations and map its methods to REST style URLs.

Edit /grails-app/conf/UrlMappings.groovy:

class UrlMappings {

 static mappings = {
     "/$controller/$action?/$id?" {
         constraints {
             // apply constraints here
         }
     }

     "/"(view: "/index")
     "500"(view: '/error')
     "/book"(controller: "book") {
         action = [GET: "list", POST: "create"]
     }
     "/book/$id"(resource: "book")
}

Entry with /book maps GET and POST HTTP requests to this URL to list and create controller methods. Below we map URLs like /book/$id using default grails REST mapping:

• GET -> show
• PUT -> update
• POST -> save (used when you know ID of item you create - not our case;)
  
• DELETE -> delete

Implementation of our controller will use GORM for data storage and will communicate with client application using JSON format. Edit /grails-app/controllers/BookController.groovy:

import grails.converters.*

class BookController {
   def list = {
       response.setHeader("Cache-Control", "no-store")
       render Book.list(params) as JSON
   }  
 
   def show = {
       Book b=Book.get(params.id)
       render b as JSON
   }  
     
   def create = {
       def json = JSON.parse(request);
       def b = new Book(json)
       b.save()
       response.status = 201
       response.setHeader('Location', '/book/'+b.id)
       render b as JSON
   }
 
   def delete = {
       Book b=Book.get(params.id)
       b.delete()
       render(status: 200)
   }
}

Run this code with grails run-app and point your browser to http://localhost:8080/GrailsRestTest/book. You should get following response:

[{"class":"Book","id":1,"author":"S.M. Mahmudul Hasan","title":"Grails"},{"class":"Book","id":2,"author":"Shohan","title":"Restfull"}]

To get particular item try http://localhost:8080/GrailsRestTest/book/1 - response should be:

{"class":"Book","id":1,"author":"S.M. Mahmudul Hasan","title":"Grails"}