List Group and List Filter

Note You can add a business element to a list group only if your Salesforce org has a business element. The business element must have the same usage type as the expression set whose version the element is to be added to.

Example Donisha, a rule designer, wants to design an expression set version to filter items in an apparel catalog based on the item’s fabric and size. She then wants to apply a 10 percent discount on the price of such filtered list items. Here’s how she configures the expression set and its version:

• Creates an expression set that’s associated with a context definition that has attribute tags that store various details related to the apparel catalog.
• Adds a list group step element to the expression set version.
• Configures the list filter in the list group, to filter items from the catalog that are made from cotton or have the size S.
• Adds a calculation step to calculate the updated price of the filtered items after deducting 10% from the price.

In this image, the items listed under ApparelCatalog are context definition tags that appear as list variables in the version. In the list filter, Donisha adds two conditions: The Fabric is cotton or the Size is S. The filter shows the items from the apparel list that meet either condition. Donisha then adds a calculation step to get the updated price for the filtered items. Price is a tag from the ApparelCatalog context definition and is used as a list variable in the calculation. Therefore, when the expression set runs, the updated price is written back to the context definition.

She then simulates the version to verify that her rule works as expected.

Here’s how she simultaneously passes multiple sets of input values for the simulation.

{
  "ApparelCatalog": [
    {
      "Size": "M",
      "Price": "50",
      "Fabric": "Silk"
    },
    {
      "Size": "S",
      "Price": "45",
      "Fabric": "Linen"
    },
    {
      "Size": "S",
      "Price": "40",
      "Fabric": "Cotton"
    },
    {
      "Size": "L",
      "Price": "55",
      "Fabric": "Cotton"
    }
  ]
}

The simulation results indicate that the filter condition evaluated to true for three of the four values passed for the list variables.

Here’s the corresponding discounted price of the filtered items.