Grails - Initiating domain class using JSON

问题

I have this simple domain class:

class Settings {
static constraints = {
    uid(nullable: false, unique: true)
    person()
}

String uid
Map person
}

and a web UI that update the data using a json request:

{"uid":1234 , person:{"first_name" : "jhon" , "last_name" : "doe"}}

in the controller code:

def json = request.JSON;
def s = new Settings(json);

it seems that s.uid is being set however the s.person Map remains empty. What am I missing?

回答1:

You can do something like the following in your controller:

def json = request.JSON;
def s = new Settings(json);
s.person = json.person;

it's ugly, but the data binding doesn't seem to handle nested json

回答2:

If you want that to work you need to convert your structure to this:

{"uid":1234 , "person.first_name": "jhon" , "person.last_name": "doe"}

回答3:

If you add this line before instantiating Settings, it will bind recursively.

JSON.use('deep')

来源：https://stackoverflow.com/questions/15067379/grails-initiating-domain-class-using-json