Question
Pegasystems Inc.
JP
Last activity: 18 Feb 2016 20:59 EST
7.1.9 How to customize JSON mapping
I have to connect an external service using JSON-REST API.
However, the API requires that
1. The request must be done by POST method, GET is not supported.
2. The JSON message should be formatted as "inputRequests=<ACTUAL JSON MESSAGE>".
3. The content type of the request must be "application/x-www-form-urlencoded".
With the Connect-REST wizard, I found that it is difficult to achieve the second API constraints, because the OOTB JSON mapper doesn't append "inputRequests=" part at the beginning of the message.
I want to know,
if there is anyway to customize JSON mapper ?
Are there any OOTB activities or extension points for JSON mapping?
The java step is the last resort in my option.
Updated: 15 Feb 2016 5:58 EST
Hi Chunzhi Hong,
If .request.body_POST is a page, then try setting a dummy property with the value "inputRequests=" and check the generated JSON and if its a pagelist then try adding a dummy first page with dummy property with the value "inputRequests=" and check the generated JSON.
If the generated JSON contains the dummy property name then try using the dummy property name as "inputRequests" with the property value as "="
I am not sure if this works or not but I think its worth to give a try.
Thanks,
Jagadesh
Pegasystems Inc.
CA
I'm afraid the only option you have is to write custom Java. You cannot use Map from as JSON for your requirement. You need to source your request from a single-value Clipboard property. Look at my response on this mesh post. https://mesh.pega.com/thread/54852?start=15&tstart=0
You need to invoke the underlying Java API to get your page content in JSON format and dump that JSON into a property and then add the prefix inputRequests=. Use this property as the Map from key with Map from as Clipboard on the request tab of your Connect REST rule.
Pegasystems Inc.
AU
Hey Chunzhi,
Are you able to map from Clipboard property (New property on Request Class, e.g. FormattedJSONPOSTBody)
As part of your pre mapping, set FormattedJSONPOSTBody = "inputRequests=" + <JSON Encoded body_POST>
There was a recent discussion on Product Support that outlined a specific method to use to Encode to JSON incorporating the Property Qualifiers, however I'm unable to find at present; as a quick test using ClipboardPage.getJSON() should work.
Pegasystems Inc.
JP
Is it possible to call getJSON() inside data transform ?
I wanted to call this Engine API inside the data transform which is automatically generated to fill out request page.
Pegasystems Inc.
CA
You can call standard rule-utility-function pxConvertPageToString() in your data transform. This internally uses getJSON().