How to insert data on Grails 3 through REST API? - rest

Question

I've build a demo project on Grails 3.0.10
I can read the data with a REST request but I don't know how to insert data.
Here's how my project is built:
grails create-app bookstore
cd bookstore
grails create-domain-class bookstore.Book
edit file grails-app/domain/bookstore/Book.groovy :
package bookstore
class Book {
String title
String author
Date publicationDate
static constraints = {
}
}
Scaffold:
grails generate-all bookstore.Book
Run the app:
grails run-app
Browse:
http://localhost:8080
From here I can insert and list items from the browser ;o)
Now I want to use the REST API !
Reading data is OK:
curl -H "Accept: application/json" -i http://localhost:8080
/book.jsonHTTP/1.1 200 OK
Server: Apache-Coyote/1.1
X-Application-Context: application:development
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunked
Date: Mon, 14 Dec 2015 12:14:01 GMT
[{"class":"bookstore.Book","id":1,"author":"James","publicationDate":"2015-12-13T23:00:00Z","title":"Hello"}]
But when I try to insert data:
curl -i -X POST -H "Content-Type: application/json" -H "Accept: application/json" -d '{"title":"Test", "author":"Franck"}'
http://localhost:8080/book/create.jsonHTTP/1.1 200 OK
Server: Apache-Coyote/1.1
X-Application-Context: application:development
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunked
Date: Mon, 14 Dec 2015 12:16:03 GMT
{"class":"bookstore.Book","id":null,"author":null,"publicationDate":null,"title":null}
And nothing is inserted.

Answer 1

The default create action doesn't save anything. It is used to populate the initial form when creating an instance using a browser form. You probably want to be invoking the save action instead.
This isn't really related to your question but FYI... if you are building a REST interface, you should look at RestfulController and/or the #Resource annotation.