How to pass object as JSON to a POST or PUT request in grails - rest

Question

I am using restful service in grails. I have 2 classes Person
import grails.rest.Resource
#Resource(formats=['json', 'xml'])
class Person {
String name
Address address
static constraints = {
}
}
and Address as
import grails.rest.Resource
#Resource(formats=['json', 'xml'])
class Address {
String house
static constraints = {
}
}
and in bootstrap I could create new person entry as follows
new Person(name:"John" , address: new Address(house:"John Villa").save()).save();
but the problem is I want to do the same thing using a POST request with JSON data.
I set the UrlMappings.Groovy like
"/app/person"(resources: "person", includes: ['index', 'show', 'save', 'update', 'delete', 'create', 'patch'])
"/app/address"(resources: "address", includes: ['index', 'show', 'save', 'update', 'delete', 'create', 'patch'])
then I tried using POSTMAN rest client by sending a POST request to '/app/person' with JSON data
{
"name":"john" ,
"address": "{'house' :'sample address' }"
}
but it gives error 422 unprocessable entity.
How can I do the same using JSON ? I want to do both insertion and updation using POST and PUT methods.

Answer 1

The issue is with the JSON you are sending. While it's valid JSON it's not the correct representation for your resource. Your JSON should be:
{
"name":"john",
"address":
{
"house":"sample address"
}
}
As you can see from the above that the address property is actually a nested object and not a String like you are sending.

Answer 2

Moreover did you check guides on http://grails.github.io/grails-doc/latest/guide/webServices.html ?
Especially I would like you to check section:
grails.mime.types = [
…
json: ['application/json', 'text/json'],
…
xml: ['text/xml', 'application/xml']
]
Remember that when you process '/app/person' with PersonInstance, you in fact execute '/app/person/index/' with PersonInstance (so debug it's source if needed).
Also double check 'id' column in your classes.