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SriVinayaga's avatar
SriVinayaga
New Contributor II
7 years ago
Solved

JSON Array transformation

Hi All,

I am in requirement to transform JSON Array Object to a simple JSON Object with values in the array as below. I have thought and nothing striking to my mind. Hence any help will be appreciated. Please let me know if this is first doable in Snaplogic.

Input:
[
{
“BrandData”: [
{
“Source”: “SF”,
“SourceBrand”: “COKE”,
“Brand”: “01”
},
{
“Source”: “SAP”,
“SourceBrand”: “11”,
“Brand”: “26”
},
{
“Source”: “AS400”,
“SourceBrand”: “12”,
“Brand”: “12”
}
]
}
]

Output:
{
BrandData:
{
“SF-COKE”: “01”,
“SAP-11”: “26”,
“AS400-12”: “12”,
}
}

Please note the objects withing BrandData after transformation is based on the values of “Source”+“-”+“SourceBrand” and the value is “Brand”. Each array value will have one value in the transformed output.

Please let me know how to proceed on this.

Thanks and regards,
Sri

9 Replies

  • tstack's avatar
    tstack
    Former Employee
    7 years ago

    You’re looking for the toObject() method on arrays. The method takes two callbacks, one to turn the array element into the key and one to turn the element into the value. I think the following will do what you want:

    $BrandData.toObject(elem => elem.Source + "-" + elem.SourceBrand, elem => elem.Brand)

    I’m also attaching an example pipeline with this expression.
    ArrayToObject_2019_07_26.slp (3.9 KB)

    • SriVinayaga's avatar
      SriVinayaga
      New Contributor II
      7 years ago

      Didnt expect it to be so simple. Thank you very much @tstack. Appreciate your help.

  • SriVinayaga's avatar
    SriVinayaga
    New Contributor II
    7 years ago

    Hi @tstack,

    There is a catch in my requirement.

    You can see there is a flower bracket at the open and end of the output instead of square bracket. Currently your solution helped to form the data, but still this issue is lingering, Any thoughts on how to transform them? I tried JSON replace, and other options etc. Did not progress further.

    • tstack's avatar
      tstack
      Former Employee
      7 years ago

      I’m not quite clear on what you’re asking for here. What does the rest of your pipeline look like? Are you trying to write the document to a file?

      Property names in JSON are quoted, so they’re necessary. Are you trying to write to a file?

  • SriVinayaga's avatar
    SriVinayaga
    New Contributor II
    7 years ago

    Also BrandData in the output shouldnt be within quotes.

  • SriVinayaga's avatar
    SriVinayaga
    New Contributor II
    7 years ago

    Yes Tim, we will write it to a file.

    The idea is to use the file as an expr library for transformation. This file is expected to be updated once a day and other pipelines will use this expr library file like a lookup. If the left value in the exprlib file matches with the input field value, it is expected to transform to the right value.

    • tstack's avatar
      tstack
      Former Employee
      7 years ago

      Ah, okay… In that case, it’s okay if the property name is in quotes, either way is acceptable.

      As for writing out just the document and not an array of docs, try selecting the “Format each document” option in the JSONFormatter.

      • abinayad's avatar
        abinayad
        New Contributor
        7 years ago

        Hi @tstack

        I have a similar requirement here. But my input to JSON formatter snap is the output from union snap and it has many segments and not one. In that case with multiple segments how can I remove square bracket and an extra curly bracket.

        Thanks,
        Abinaya