How to : Using Ruby filter, Perform db lookup while iterating the array

My jdbc_streaming produce an array like this

"attachment": [
{
	"departmentid" 	: "2"
}]

now i would like to lookup my db using the departmentid, and get the equivalent department name and put it as below

"attachment": [
{
	"departmentid" 	: "2",
	"department" : [
     {
           "department": "dept2"
           "other_details_here": ""
     }
     ]
}}

I can do this query if my attachment is flat,
Select departmentName as department from Department where id = :departmentid

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