Using karate.forEach and karate.set to extract index of value from json array

Question

I have the below json:

{
  "id": [
    "1A",
    "2B"
  ],
  "name": [
    "rs",
    "mk"
  ]
}

I want to extract the id value when name is 'rs' or 'mk'. There will be no duplication of name values and the size of id and name keys will always match.

So i have created the following scenario where:
- I iterate through the name array using forEach.
- Find if the value of name matches rs or mk and if it does, retrieve the index.
- Then use this index to find the retrieve the value from id key.

When I run this, the name_rs_idx and name_mk_idx are not being set and are blank.

Scenario: Using forEach and karate.set
    * def vals = { id: ['1A', '2B'], name: ['rs', 'mk'] }
    * def name_rs_idx = ''
    * def rsFun =
      """
        function(x, i) {
          if(x == 'rs') {
            karate.set(name_rs_idx, i);
          }
        }
      """
    * karate.forEach(vals.name, rsFun)
    * print 'RS Index - ' +  name_rs_idx
    * def name_rs_id = vals.id[name_rs_idx]
    * print 'RS id -' + name_rs_id

    * def name_mk_idx = ''
    * def mkFun =
    """
      function(x, i) {
        if(x == 'mk') {
          karate.set(name_mk_idx, i);
        }
      }
    """
    * karate.forEach(vals.name, mkFun)
    * print 'MK Index - ' + name_mk_idx
    * def name_mk_id = vals.id[name_mk_idx]
    * print 'MK id -' + name_mk_id

Maybe i am not using the forEach function correctly or logic is incorrect.

Peter Thomas · Accepted Answer · 2019-08-13 15:16:27Z

1

I think you are over-complicating things :) Here is my solution, take time to read and understand it, it will improve your Karate fundamentals ! To simplify things, we first combine the data into an array of { name: '', id: '' } pairs. Then things become much easier.

* def vals = { id: ['1A', '2B'], name: ['rs', 'mk'] }
* def fun = function(x, i){ return { name: vals.name[i], id: vals.id[i] } }
* def pairs = karate.map(vals.name, fun)
* def fun = function(x){ return x.name == 'rs' || x.name == 'mk' }
* def filtered = karate.filter(pairs, fun)

answered Aug 13, 2019 at 15:16

Peter Thomas

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2 Comments

Mio Mio Over a year ago

I have a problem similar to the original poster, but in my case 'rs' and 'mk' have to be variables, I can't find any example of filter function with variables. What do you think I can do?

Peter Thomas Over a year ago

@MioMio ask a new question ?

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