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how to send dictionary in invoke http processor

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hi everyone ,

We want to put data in web app using API endpoint 

https://localhost:8000/api/event/${id}/attributes this is the API endpoint that i have used in invoke HTTP processor in Remote URL field with PUT method. 

we want to create new attribute with value and this attribute is a dictionary type so we have to pass the data in the dictionary format for this we have used updateattribute processor and attributetojson processor. 

updateAttribute processor snap

renuu_0-1591268658480.png

Attributetojson processor snap

renuu_1-1591268717755.png

and the below is out of attributetoJson processor (flowfile)

{"note":"note from nifi","attributes":"{\n \"workflow\":\"process\"\n }","id":"1ecfbcbb-38bf-49e9-a77e-a88w"}

 

the error msg in invoke http processor 

{ "code": 500, "errors": [ "Traceback (most recent call last):\n File \"/usr/local/lib/python3.6/site-packages/flask/app.py\", line 1949, in full_dispatch_request\n rv = self.dispatch_request()\n File \"/usr/local/lib/python3.6/site-packages/
No value set
 
as per my knowledge this is type error. I think the Dictionary is not sending in correct format . i have also used ${attributes:unescapeJson()} in updateAttribute ...but i think i have made a mistake in the declaration
property_nameproperty_value
attributes{"workflow": "process"}
'attributes' ${attributes:unescapeJson()}
 
 thanks 

 

1 ACCEPTED SOLUTION

@renuu You have to build the final values you want as separate key value pairs like this:

UpdateAttributeUpdateAttribute

Next you will use these attributes  to create a json object attribute using AttributesToJson:

 

AttributesToJson flowfile-attributeAttributesToJson flowfile-attribute

 

After that, if you inspect the flowfile you will see the json object as JSONAttributes:

 

FlowFile Attribute JSONAttributesFlowFile Attribute JSONAttributes

 

From here you can use it as ${JSONAttributes} or if you need it to be called ${attributes} you just use another UpdateAttribute:

 

Screen Shot 2020-06-04 at 8.27.00 AM.png

View solution in original post

1 REPLY 1

@renuu You have to build the final values you want as separate key value pairs like this:

UpdateAttributeUpdateAttribute

Next you will use these attributes  to create a json object attribute using AttributesToJson:

 

AttributesToJson flowfile-attributeAttributesToJson flowfile-attribute

 

After that, if you inspect the flowfile you will see the json object as JSONAttributes:

 

FlowFile Attribute JSONAttributesFlowFile Attribute JSONAttributes

 

From here you can use it as ${JSONAttributes} or if you need it to be called ${attributes} you just use another UpdateAttribute:

 

Screen Shot 2020-06-04 at 8.27.00 AM.png

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