Access to JSON element in groovy map - json

Question

I'm trying to access an element of some json returned into a map from an api call so I can pass it to another api call. I can't seem to properly create a varible and give it the value I need. Here's the returned json, I need to access the Id element.
{
"totalSize": 1,
"done": true,
"records": [
{
"attributes": {
"type": "User",
"url": "/services/data/v24.0/sobjects/User/MYIDNUMBER"
},
"Id": "MYIDNUMBER"
}
]
}
here's the restful service call I use and my attempt to access the Id element and put it in sfId so I can use it in my next API call
def http = new HTTPBuilder(instance_domain)
http.request(GET,JSON) { req ->
uri.path = "services/data/v24.0/query/"
uri.query = [q:"SELECT Id from User WHERE Email = '$loginid#myschool.edu'"]
headers['Authorization'] = "Bearer $access_token"
response.success = { resp, json ->
json.each{ key,value ->
sfMap = [sfUser: [json: json]]
}
sfId = sfMap[records.Id]
}
response.failure = { resp, json ->
println resp.status
println json.errorCode
println json.message
}
}
I get the following error on the server where the portletized version of this is deployed
2014-07-08 08:02:39,710 ERROR [http-bio-443-exec-161] portal-web.docroot.html.portal.render_portlet_jsp:154 groovy.lang.MissingPropertyException: No such property: records for class: groovyx.net.http.HTTPBuilder$RequestConfigDelegate

Answer 1

Based on your json structure, here's what I can say. The records is an array which potentially can contain number of objects hence number of Ids.
def json = new groovy.json.JsonSlurper().parseText ("""
{
"totalSize": 1,
"done": true,
"records": [
{
"attributes": {
"type": "User",
"url": "/services/data/v24.0/sobjects/User/MYIDNUMBER"
},
"Id": "MYIDNUMBER"
}
]
}
""")
If you are sure about first element's Id, then this will do the trick:
println json.records.first().Id
Otherwise, this might be better option which will give you Ids of all the objects in records.
println json.records.collect{ it.Id }

Answer 2

#kunal, that helped.
For future refernce, here's how I added the delcaration of a varible to be used later on, assigning it the value from the json responce.
def http = new HTTPBuilder(instance_domain)
http.request(GET,JSON) { req ->
uri.path = "services/data/v24.0/query/"
uri.query = [q:"SELECT Id from User WHERE Email = '$loginid#myschool.edu'"]
headers['Authorization'] = "Bearer $access_token"
response.success = { resp, json ->
sfId = json.records.first().Id <----- this did the trick
json.each{ key,value ->
sfMap = [sfUser: [json: json]]
}
}
response.failure = { resp, json ->
println resp.status
println json.errorCode
println json.message
}
}