My challenge today was to create a Web Template for a D365 Portal that returned a JSON object from a FetchXML query. There are a few blog posts around on how to achieve this, including this one from my colleague Nadeeja.

The complication for me was the FetchXML contains an ‘in’ operator which would contain a dynamic number of values.

The solution requires the creation of a Liquid array which can then be used in the construction of the FetchXML. To create the array I pass a comma separated list of values of GUIDs I need included in the query. Using the Liquid Assign variable tag i can create the array.
{% assign groupIds = request.params['groupIds'] | split: ',' %}
Within the Web Template I can iterate through the array as part of the construction of the FetchXML query.

To test the response I created a POST within Postman to the URL and supplied the named parameter, groupIds, as a comma separated list of values. The POST request is made using form-data and returns the relevant number of items based on the number of items in the groupIds array.