Use template (Custom Data Types) to create a custom data type and populate it with data received from a POST request.

Use case

When the service is invoked with JSON data, the service will respond by mapping data fields to a custom data type. This template can be used to create a custom data type and populate it with data received from a POST request.

Prerequisites

• Pull the template from central
  bal new -t choreo/custom_data_types <newProjectName>

Run the template

Run the Ballerina project created by the service template by executing bal run from the root.

Once successfully executed, Listener will be started at port 8090. Then you need to invoke the service using the following curl command

$ curl http://localhost:8090/average_grade -d '{"studentId": "1874", "firstName": "Jane", "lastName":"Smith", "mathematics" : 85, "science" : 75, "arts":80}' -H "Content-Type:application/json"

Now service will be invoked and returns data of student for a given student Id by mapping it to a custom data type

{"studentId":"1874", "averageGrade":80.0}