Record Type Paging Grid: Pre-Populating Selection

Question

I am creating a paging grid with selection that is based on a recordType! in my environment. 
 My interface is set up to follow the paradigm in https://docs.appian.com/suite/help/22.1/grid-with-selection-pattern.html#[line-1-54]-define-local-variables-and-grid-data but with the "data" parameter in the gridField obtained via recordType. 
 Code below: 
 a!localVariables(
local!selection:index(ri!selectedStuff,"id",{}),
local!selectedRows, /*this is what i need to populate*/
..
a!gridField(
data:recordType!Foo,
selectable:true,
selectionValue:local!selection,
selectionSaveInto:{
 local!selection,
 a!save(local!selectedRows,append(local!selectedRows,fv!selectedRows)),
 a!save(local!selectedRows,difference(local!selectedRows,fv!deselectedRows)),
 a!save(ri!selectedStuff,local!selectedRows)
 }
)
) 
 In my use case, I want to be able to pre-populate my local!selectedRows so that the grid can be pre-selected coming into the screen. 
 This is an entity-backed record, and passing a CDT array (of that entity) makes the page error on additional selection (why...it is an entity backed record and I am using the same entity) 
 I have also tried calling a queryrecordtype() to set local!selectedRows, but this also does not let me select/deselect. 
 How can I pre-populate the local!selectedRows with the record data I want to be selected?

Mike Schmitt · Accepted Answer

fv!selectedRows is difficult to use, and "recordType!" style data is super difficult to use, and you're hitting an intersection between the two. Good luck, I guess. 
 Evan Rust said: passing a CDT array (of that entity) makes the page error 
 This is because CDT data and "recordType!" data is not cross-compatible. Not only that but there's no direct way to cross-cast it, and (as mentioned already) it's super convoluted to do *anything* with. 
 My suggestions would be to pick at least one of: a) make your grid QueryEntity based; and/or 2) make your GridSelections PKID based instead of "whole row of data" based.

Record Type Paging Grid: Pre-Populating Selection

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