"If" expression can support multiple statement within { } block

[wutichai-woody]

Hi,
I'm using benthos since v3. Can mapping in v4 to support If expression with multiple statement within blacket block?
Ex.

{
"data_list": [
...
...
...
]
}

let var1 = root.data_list
root.result = if this.data.exists('code') {
root.field1 = "x"
root.field2 = "y"
root.field3 = this.data_list or $var1
} else {
root.field1 = "a"
root.field2 = "b"
}

// result
when true
{
"result": {
"field1": "x",
"field2": "y",
"field3": [
...
...
...
]
}
}

when false
{
"result": {
"field1": "a",
"field2": "b",
}
}

[mihaitodor]

Hey @wutichai-woody I'm really struggling to understand what you're asking. Would you mind formatting your code properly and giving a clear example that I can run with exact input and output? Otherwise, not sure how to help you except maybe point out pattern matching.

[wutichai-woody]

Hi @mihaitodor, Thanks for your reply. Sorry for unclear question. I prepare clear question as follows.

INPUT :
{
"data": {
"code": "1234"
},
"list_a": [
...
...
...
]
"list_b": [
...
...
...
]
}

In mapping:

• mapping : |
  root = {}
  let var1 = root.list_a
  let var2 = root.list_b
  root.result = if this.data.exists('code') {
  root.field1 = "x_1001"
  root.field2 = "y_1001"
  root.field3 = $var1
  } else {
  root.field1 = "x_1111"
  root.field2 = "y_1111"
  root.field3 = $var2
  }

OUTPUT:
when true
{
"result": {
"field1": "x_1001",
"field2": "y_1001",
"field3": [
... value of "list_a" from INPUT
]
}
}

when false
{
"result": {
"field1": "x_1111",
"field2": "y_1111",
"field3": [
... value of "list_b" from INPUT
]
}
}

[mihaitodor]

I don't know how you're writing that mapping, but here's a cleaned-up version which I think outputs what you're looking to get:

let var1 = this.list_a
let var2 = this.list_b
root.result = if this.data.exists("code") {
    {
        "field1": "x_1001",
        "field2": "y_1001",
        "field3": $var1 
    }
} else {
    {
        "field1": "x_1111",
        "field2": "y_1111",
        "field3": $var2
    }
}

Are you looking to make extra changes to it?

[wutichai-woody]

Thanks so much @mihaitodor