Cannot read attribute from JSON element

Question

I'm trying to fetch the value from an attribute in the payload but Karate throws an error or simply doesn't fetch the value.

I've created a simplified version of my code to make it easier to understand.

* def lists = [{@id: 1, type: 'video'}, {@id: 2, type: 'image'}]
* def ser = {@id: 2, type: '#string'}

* def foundAt = []
* def fun = function(x, i){ if (karate.match(x, ser).pass) foundAt.add(i) }
* eval karate.forEach(lists, fun)
* def storeId = lists[foundAt[0]].@id
* def storeType = lists[foundAt[0]].type
* print storeId
* print storeType

print storeType will print the value as expected but print storeId will print the following error message:

javascript evaluation failed: lists[foundAt[0]].@id, <eval>:1:18 Expected ident but found error
lists[foundAt[0]].@id
                  ^ in <eval> at line number 1 at column nu*mber 18

I expect the value '2' to be printed but clearly I'm doing something wrong?

Peter Thomas · Accepted Answer · 2019-01-28 09:35:13Z

1

One small change will do the trick since @ is a "bad" character for JSON key-names:

* def storeId = lists[foundAt[0]]['@id']

Here's also a suggested simplification to your code:

* def fun = function(x, i){ return karate.match(x, ser).pass }
* def found = karate.filter(lists, fun)
* def storeId = found[0]['@id']
* def storeType = found[0].type
* print storeId
* print storeType

answered Jan 28, 2019 at 9:35

Peter Thomas

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