Question

I have a table called ‘District’ in my database:

+----+---------+-------------+----------+------+------------------------------------------------+-----------+
| id | version | description | homepage | logo | name                                           | region_id |
+----+---------+-------------+----------+------+------------------------------------------------+-----------+

so, on my controller i have:

def show = {
        def districtInstance = District.get(params?.id)
        println districtInstance
        println params
        if(!districtInstance){
            flash.message = "${message(code: 'default.not.found.message', args: [message(code: 'district.label', default: 'District'), params.id])}"
            redirect(action : "list", params?.id)
        }
        else{
            [districtInstance : districtInstance]
        }
    }

While I’m expecting to see the full row:

| 71 |       0 | bogus  |          |      | bogus                                      |         4 |

I only see:

bogus

on the console. How can I have access to the entire row? (Specially districtInstance.region_id? )

Answer 1

println districtInstance?.region.id

In Groovy, and object oriented languages in general, you can to navegate class properties like that, but you should are aware of the Law of Demeter