Is it possible to dynamically add values ​​to an array?

[diegolatorre16]

Hi, suppose I have an input JSON like this:

{
"key1": "value1",
"key2": "value2",
...
"results" [ ]
}

I need to evaluate my rules and from these evaluations add results to the "results" array. I would mainly use "decision tables"... is there a way to dynamically add these values ​​to the array in the outputs?
thanks!

[stefan-gorules]

Hi, this is indeed possible. You can use the loops to handle array of results. More information is available here: https://docs.gorules.io/docs/loops.

[diegolatorre16]

thanks!

[diegolatorre16]

@stefan-gorules
Hi, I'm trying the example from the documentation you shared with me and it actually works. However, it works when you have an array of "dictionaries"/"maps"/"objects" in the input, like:

"items": [
      {
        "name": "Laptop",
        "amount": 1200,
        "group": "electronics"
      },
      {
        "name": "Mouse",
        "amount": 25,
        "group": "accessories"
      }
    ]

But, for example in my use case, I have an array of strings, it would be something like this:

{
    "items": [
        "Laptop",
        "Printer",
        "Mouse"
    ]
}

(In my system they are not items, but I will put the example with items to continue with the example)
So, let's say I want to iterate over items and if it's "Laptop" offer a coupon for the next purchase...My model would look something like this:

My full input would be:

{
    "customer": {
      "name": "John Doe",
      "country": "US"
    },
    "items":  [
        "Laptop",
        "Printer",
        "Mouse"
    ]
}

But, the result is not what I expected. I get this:

{
  coupon: [
    'Laptop',
    'Printer',
    'Mouse',
  ],
  customer: {
    country: 'US',
    name: 'John Doe',
  },
  items: [
    'Laptop',
    'Printer',
    'Mouse',
  ],
}

(Lo que quisiera es obtener en coupon el array con los mensajes de coupon).
Is there any way to iterate over string arrays to get this behavior? Thanks a lot

[stefan-gorules]

Hi @diegolatorre16

You may achieve the above by using

Note the $root variable

But I would generally advise to map it to some object first.

[diegolatorre16]

Great!!! Thanks for your quick answer!!!! I thought it wasn't possible!