Binding Indexed Properties in Grails 0

Here's an example of how to bind indexed properties to a Grails (or Spring) domain or command object without having to hand roll the parameter parsing and binding.  The  domain object graph is simple, and based on a project I'm currently working on, but this method can be applied to any sized object graph.

class LeagueMembersCommand implements Serializable{

	String[] types
	String[] firstNames
	String[] lastNames
	String[] emails
	Integer[] handicaps
	
	static constraints = {
		types(nullable:false)
		firstNames(nullable:false)
		lastNames(nullable:false)
		emails(nullable:false)
		handicaps(nullable:false)
	}
}

Here is the relevant snippet from my league/create.gsp file:

<g:each var="i" in="${(0..< lmc?.types?.length)}">
<tr class="${(i % 2) == 0 ? 'odd' : 'even'}">
	<td>${i + 1}</td>
	<td><g:select name="types.${i}" from="${['Full Time', 'Sub']}" 
                      value="${lmc?.types[i]}"/></td>
	<td><g:textField name="firstNames.${i}" value="${lmc?.firstNames[i]}" /></td>
	<td><g:textField name="firstNames.${i}" value="${lmc?.lastNames[i]}" /></td>
	<td><g:textField name="emails.${i}" value="${lmc?.emails[i]}" /></td>
	<td><g:textField name="handicaps.${i}" value="${lmc?.handicaps[i]}" /></td>				    	
</tr>
</g:each>

The important thing to note here is that in order to have Grails or Spring bind indexed 
properties to an Array or a List on your domain object, you must append a '.' and a 
number representing the index to the end of the property name you want to bind to.  
This example is very simple, and only uses String arrays on a simple Command object, 
but you could easily apply this method to an object graph instead.