Is it possible to filter Dataquest that is created using a!foreach?

Question

Hello, 
 
 I've created a datasubset using a!foreach. Now want to filter the data on the datasubset depending on the value for one field. Can you please suggest on this? 
 a high level snippet is below. Below rule returns a datasubset & on that datasubset I am trying add a filter. 
 
 todatasubset( 
 a!forEach( items: rule!Irulename(), expression: 'type!{urn:com:appian:types:cdt}|cdt_name'( fields:, completed: rule!newRuleToupdateafield ) ) 
 )

Mike Schmitt · Accepted Answer

I'm not sure what the requirements are of the "filtering" you want to perform, but in general, you can use a!forEach() to loop over items in any array (including dictionaries, CDTs, etc), and any items that don't match the condition you want, just return the empty set "{}". 
 Note: If there's a chance that all rows may be filtered out under any condition, you need to wrap the whole thing in "a!flatten()" as well, since otherwise using the above technique would return a list of empty sets specifically when all results are empty sets (otherwise it performs as expected).

Chris · Answer

As an example, try this in a blank interface: 
 a!localVariables(
 local!options: {"A","B","C","D"},
 local!selected: null,
 local!data: todatasubset(
 a!flatten(
 fn!reject(
 fn!isnull,
 a!forEach(
 items: local!options,
 expression: if(
 fv!item=local!selected,
 null,
 {
 data: fv!item
 }
 )
 )
 )
 )
 ),
 a!columnsLayout(
 columns: {
 a!columnLayout(
 contents: {
 a!dropdownField(
 label: "Filter Out",
 choiceLabels: local!options,
 choiceValues: local!options,
 placeholder: "-- Select --",
 value: local!selected,
 saveInto: local!selected
 )
 }
 ),
 a!columnLayout(
 contents: {
 a!richTextDisplayField(
 label: "Result",
 value: a!forEach(
 items: local!data,
 expression: {
 a!richTextItem(
 text: fv!item.data
 ),
 char(13)
 }
 )
 )
 }
 )
 }
 )
)

Is it possible to filter Dataquest that is created using a!foreach?

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