Splitting JSON Objects into ArrayLists

Last updated on Dec 15, 2022
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In this example, we will split JSON objects from a JSON data string into ArrayLists.

Consider the following sample Event from the FIFA Event Type, which contains the details of five venues in the locations object:

{
	"event_name": "FIFA",
	"properties": {
		"locations" : "{\"Venue 1\": {\"id\": 3445, \"name\":\"Doha\"}, \"Venue 2\": {\"id\": 6061, \"name\":\"Lusail\"}, \"Venue 3\": {\"id\": 6062, \"name\":\"Al Khor\"}, \"Venue 4\": {\"id\": 6063, \"name\":\"Al Rayyan\"}, \"Venue 5\": {\"id\": 6064, \"name\":\"Al Wakrah\"}}"
	}
}		

The following Transformation script:

  • Creates ArrayLists from the id and name keys in the locations object.

  • Adds the values of the id and name keys as the elements to the corresponding ArrayList.

from io.hevo.api import Event

import json

def transform(event):
    eventName = event.getEventName()
    properties = event.getProperties()

    if 'locations' in properties:
        for k,v in json.loads(properties["locations"]).items():
            for key, value in v.items():
                properties["locations."+key] =[]

        for k,v in json.loads(properties["locations"]).items():
            for key, value in v.items():
                properties["locations."+key].append(value)

        for each in range(len(properties["locations.id"])):
            properties["locations.id"][each]=int(properties["locations.id"][each])

        del properties["locations"]
    return event

The output from the above snippet is:

{
	"event_name": "FIFA",
	"properties": {
		"locations.name": "[\"Al Wakrah\",\"Lusail\",\"Al Rayyan\",\"Al Khor\",\"Doha\"]",
		"locations.id": "[6064,6061,6063,6062,3445]"
	}
}

As you can see above, the Transformation splits the locations object into the locations.name and locations.id ArrayLists.


Revision History

Refer to the following table for the list of key updates made to this page:

Date Release Description of Change
Dec-19-2022 NA New document.

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