featuresetByName help in Field Maps

[CJCowardin]

I'm trying to use an example I found to work with my data. I have a Sign layer that will be collected with Field Maps.  In that layer is a field called Parent_Asset_ID.  I have another layer called County_Parks. Inside County_Parks is a field called Asset_ID. I need the Parent_Asset_ID to fill in with the Asset_ID from the County_Parks layer. This is what I did:

// Create a feature set using the 'County_Parks' layer in the map

var County_Parks = featuresetByName($map, 'County_Parks', ['Parent_Asset_ID'])

// Intersect the current location with the County_Parks and

// get the first park

var County_Parks = First(Intersects($feature, County_Parks))

// If the current location does intersect a feature,

// return the name of the County_Park. Otherwise, return null

if (!IsEmpty(County_Parks)) {

    return County_Parks['Parent_Asset_ID']

} else {

    return null

}

[DougBrowning · Accepted solution]

What is going wrong?  Is it a crash?

I do know that if you try to run First on an empty set then it will crash.  So you need to check the intersect for IsEmpty before you try First.

So more like this

var County_Parks = featuresetByName($map, 'County_Parks', ['Parent_Asset_ID'])

// Intersect the current location with the County_Parks and

var County_Parks = Intersects($feature, County_Parks)

// If the current location does intersect a feature,

// return the name of the County_Park. Otherwise, return null

if (!IsEmpty(County_Parks)) {

    return First(County_Parks)['Parent_Asset_ID']

} else {

    return null

}

[CJCowardin]

When I test it in the expression window, it comes back with "Test execution error: Execution error - Cannot access property of null object. Verify test data."

On the map, when I start editing, it just says Failed to calculate value

[CJCowardin]

I got it to work! Thanks.