I have a flow that is designed to pull tweets using Get twitter processor and I use JOLTTransformJSON processor to extract few attributes including the hashtags, my Jolt Specification is as follows
[
{
"operation": "shift",
"spec": {
"entities": {
"hashtags": {
"*": "hashtags"
}
},
"text": "content",
"id": "id",
"timestamp_ms": "timestamp",
"retweet_count": "retweetcount",
"url": "url"
}
},
{
"operation": "default",
"spec": {
"type": "twitter"
}
},
{
"operation": "cardinality",
"spec": {
"hashtags": "MANY"
}
}
]
when the twitter output contains hashtags the JOLTTransformJSON processor output will give me those hashtags in the following way
{
"hashtags": [{
"text": "Venus",
"indices": [16,
22]
},
{
"text": "Cancer",
"indices": [69,
76]
},
{
"text": "ascendant",
"indices": [86,
96]
}],
"content": "acmc_clock_euro #Venus is now (16h58m01s UT) setting at 10°32'50.2'' #Cancer opposite #ascendant at Helsinki, SF",
"id": 895332436975931393,
"timestamp": "1502298862104",
"retweetcount": 0,
"url": "https://twitter.com/pe602/status/895332436975931393",
"type": "twitter"
}
but if the hashtags array is empty as follows
"entities": {
"hashtags": []
the output will not contain hashtags, how can I make the output have hashtags element but with an empty array if the twitter op doesn't have hashtags using JOLT processor.
Try this in your 2nd "default" operation.
{
"operation": "default",
"spec": {
"hastags": [],
"type": "twitter"
}
}
Resolved this by using "modify-default-beta" operation as follows
{ "operation": "modify-default-beta", "spec": { "hashtags": [] } }
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