Thank you both very much Doug and Christopher, I tried using your advice but still not having any luck.
@ChristopherCounsell I was seeing odd behavior of the survey creating new, null geometries in my culvert line layer and attaching the related assessment record to that instead of the correct feature. So to troubleshoot, I tried passing feature's GlobalID through the URL to see if that would work. It did not.
@DougBrowning I also tried following the links you sent and set up an Arcade expression to build and encode the URL that way and have it scrape away the {} from the GlobalID, and after splitting the Concatenate in two I was able to test it. Unfortunately it still isn't pulling over any information from the parent culvert layer including the GlobalID.
My Arcade expression to build the URL is below. I needed to perform some IF statement checks to ensure null values weren't trying to be sent through in the URL and then adding a couple more Concatenates to ensure everything was pieced together correctly. As an aside, I noticed that Concatenate only works for three inputs at a time. After some testing I found that the GlobalID was being sent from FieldMaps to Survey123 correctly without needing to scrape out the {}, so maybe ESRI started making improvements on it?
var S123urlsource = 'arcgis-survey123://?itemID=ITEMID&field:Culvert_GUID='+$feature.globalid+'&field:Culvert_Function='+$feature.Culvert_Function+'&field:Material='+$feature.Material+'&field:Culvert_Shape='+$feature.Culvert_Shape+'';
var materialcheck = IIF($feature.Material_Other!=null,Concatenate(S123urlsource,'`&field:Material_Other='+$feature.Material_Other+``),'')
var shapecheck = IIF($feature.Culvert_Shape_Other!=null,Concatenate(S123urlsource,'`&field:Culvert_Shape_Other='+$feature.Culvert_Shape_Other+``),'')
var callback = '&callback:submit='
var FMurlsource='https://fieldmaps.arcgis.app?';
var FMparams='itemID%3DITEMID%26referenceContext%3Dopen%26featureSourceURL%3Dhttps://services1.arcgis.com/FNSBkbt9MsC1V9Cx/arcgis/rest/services/Culvert_Inventory_and_Assessments/FeatureServer%26';
var appendchecks = Concatenate(S123urlsource,materialcheck,shapecheck)
var firstpart= Concatenate(appendchecks,callback,UrlEncode(FMurlsource));
var final = Concatenate(firstpart,FMparams)
return final
But unfortunately I've run out of time to dedicate towards figuring out how to have both the parent and child fields in the Survey form, so I had to re-create everything in order to have something working quickly. I now have it working by having only the related Assessment fields were in the survey form then duplicating some of the culvert fields into the related Assessment table and converting my "select all that apply" requirement into several Yes/No fields.
It's not my ideal solution, but it gets staff out into the field to begin data collection.
Again thank you both for your insights and advice, I really appreciate it!
I hope to one day be able to revisit this and really dive into how to get it to work.
Caitlin
