Groovy: json get value of id based on child value - json

Question

I have a json as below:
[
{
"id":6619137,
"oid":"6fykq37gm60x",
"key":{
"key":"6619137"
},
"name":"Prod",
"planKey":{
"key":"PDP"
},
"environments":[
{
"id":6225923,
"key":{
"key":"6619137-6225923"
},
"name":"Production",
"deploymentProjectId":6619137,
}
],
},
{
"id":6619138,
"oid":"6fykq37gm60y",
"key":{
"key":"6619138"
},
"name":"QA",
"planKey":{
"key":"QDP"
},
"environments":[
{
"id":6225924,
"key":{
"key":"6619138-6225924"
},
"name":"QA",
"deploymentProjectId":6619138,
}
],
},
]
I can use the below code to extract the value of id and environments.id based on the name value. projectID will give 6619137 and environmentID will give 6225923
def e = json.planKey.find{it.name=='Prod'}
def projectID = e.id
def environmentID = e.environments[0].id
However, when I try to extract the value of id and environments.id based on the plankey.key value (e.g. PDP or QDP), using the same format above returns me an error of java.lang.NullPointerException: Cannot get property 'id' on null object at Script60.run(Script60.groovy:52)
def e = json.planKey.find{it.planKey=='{key=PDP}'}
def projectID = e.id
def environmentID = e.environments[0].id
Is there a way I can get the projectID with the plankey key value?

Answer 1

Think of your JSON object as a key/value map with multiple levels. There is no such item as
json.find{it.planKey=='{key=PDP}'}
However, you can find with values at any level, like this:
def e = json.find{it.planKey.key == "PDP"}
If you have a structure where planKey may not exist, or it doesn't always have key, that's a bit different, but from your question it sounds like that's not the case here.
EDIT: correcting syntax based on comment below.