Ok, I gave this a try but I'm sure it's not the best method that exists. I'm mostly posting this because people love to be right on the internet, so by posting something dumb hopefully both of us can get the actual solution...
This was more complicated than I thought it would be due to needing to use Arcade to filter the data, but then by bringing the data in via Arcade, it seems none of the token stuff happens automatically for the attachments (to make sure you're actually allowed to access this non-public data). I don't know anything about tokens, but I think the token you grab via the directions below might expire eventually (?), so that's something to consider.
To get the token:
- Go to the layer's item page and click on the layer
- Open up the ArcGIS REST Services Directory
- Scroll down and click Query Attachments
- Enter any valid objectid in the Object IDs field
- Click Query Attachments (GET)
- Copy the resulting image attachment link and paste into Notepad
- Get the token (everything after ?token=) and paste into your code
// Access photos layer
var p = Portal("https://www.arcgis.com")
var photos = FeatureSetByPortalItem(p, "695a35a53a3b45628c840c48a366ad7c", 0, ['OBJECTID', 'DAY'], false)
// Get today's day of the month
var todaysDay = Day(Today())
// Filter photos layer by day of the month
var filteredPhoto = Filter(photos, "DAY = @todaysDay")
// Set up a dictionary
var newDict = {fields: [
{name: 'Day', alias: 'Day', type: 'esriFieldTypeSmallInteger'},
{name: 'Photo_URL', alias: 'Photo URL', type: 'esriFieldTypeString'}
],
geometryType: '',
features: []
}
// Get the photo
for (var photo in filteredPhoto){
var attach = Attachments(photo)
var Part1 = "https://services8.arcgis.com/IGysY44dU9lNnAZQ/arcgis/rest/services/TestTestTest/FeatureServer/0/"
var ObjectID = photo.OBJECTID
var Part2 = "/attachments/"
var AttachID = First(attach).ID
var Token = "?token=This will be a really long string"
Push(newDict['features'], {attributes: {Day: photo.Day, Photo_URL: Part1 + ObjectID + Part2 + AttachID + Token}})
}
// Create a featureset from the dictionary
var photo_fs = FeatureSet(newDict)
return photo_fs
