Grails - Data Binding One to One Association Not Working

Question

I'm trying to do a straight forward data bind that involved two domain classes in a one to one association. Here's the two classes:

class Request
{
  static hasOne = [form: Form]

  Form form
}

class Form
{
  static belongsTo = [request: Request]

  String string
}

I then do the following data binding (this is to demonstrate the problem ... the real data bind comes from a form):

Request request = new Request()
request.properties = ['form.string': 'string value']

However, I end up with a Request object that has a null form property instead of a Request object that has a Form object for its form property along with the string value.

Answer 1

Turns out the problem wasn't with the actual classes, but the map being passed to the data binding. Even though according to the Grails documentation the following should have worked:

Request request = new Request()
request.properties = ['form.string': 'string value']

it doesn't. However, if I change the map to be I get proper binding:

Request request = new Request()
request.properties = [form: [string: 'string value']]

Answer 2

Try with this

class Request
{
  Form form
}

class Form
{
  static belongsTo = [request: Request]

  String string
}