include 
Purpose
Includes the response of another controller/action or view in the current response
Examples
Example controller for an application called "shop":class BookController {
     def list = { [ books: Book.list( params ) ] }
     def show = { [ book : Book.get( params['id'] ) ] }
} Example usages for above controller:<g:include action="show" id="1" />
<g:include action="show" id="${currentBook.id}" />
<g:include controller="book" />
<g:include controller="book" action="list" />
<g:include action="list" params="[sort:'title',order:'asc',author:currentBook.author]" /> 
Example as a method call in controllers, tag libraries or GSP:def content = g.include(action:'list',controller:'book')
 
Description
Attributes
action (optional) - the name of the action to use in the include 
controller (optional) - the name of the controller to use in the include 
id (optional) - the id to use in the include 
view (optional) - The name of the view to use in the include 
params (optional) - a map containing request parameters 
model (optional) - Any request attributes (the model) to pass to the view to be included 
Source
Show Source
def include =  { attrs, body ->
		if(attrs.controller || attrs.view){
			def mapping = new ForwardUrlMappingInfo(controller:attrs.controller,
													action:attrs.action,
													view:attrs.view,
													id:attrs.id,
                                                    params:attrs.params)			out << WebUtils.includeForUrlMappingInfo(request,response,mapping, attrs.model ?: [:] )?.content
		}
	}