Latest Contributions by Bud

@MobiusSnake Regarding... "defaultValue" : "NEWID() WITH VALUES" ...in your original JSON definition for a GUID default value: { "fields": [ { "name" : "MyID", "type" : "esriFieldTypeGUID", "alias" : "My ID", "sqlType" : "sqlTypeOther", "length" : 38, "nullable" : false, "editable" : false, "domain" : null, "defaultValue" : "NEWID() WITH VALUES" } ] } As far as I can tell, WITH VALUES doesn't seem to do anything, and can be removed from the JSON. At first, I thought WITH VALUES was responsible for back-populating existing rows. But now I suspect making the field not nullable is responsible for back-populating existing rows. Do you see the same thing on your end?   ... View more

So far I'm totally stumped on getting any text functions to work ... everything I try to put into a string field just ends up writing the function name and parameters as a literal string, e.g. "CONCAT(v1,v2)" .  I'm not sure whether there's a way around that. The same thing happens for me. I wonder if Esri (or an underlying mechanism) has intentionally disabled expressions for text fields for security reasons. Would there be SQL injection concerns? That's not something I know anything about. Whereas, maybe there aren't SQL injection concerns for GUID or integer fields, so expressions are allowed there. Or, does the system just have no way of differentiating a literal string from an expression/function? And GUID & integer fields don't have this problem because strings aren't valid in those fields? Edit - AGOL idea: Allow expressions in AGOL string field > default value ... View more

Good point. I have to admit, I haven't used relationship classes much. I'll try them out. Do they automatically populate GUID fields? ... View more

Nice find! Replacing the parameter of IDENT_CURRENT with the layer/table's internal table name (you can get this from the layer/table properties in the Admin REST API) gives me a copy of the Object ID. I didn't see the database name, user name, or true table name in the Admin REST API page. But I did find it in the JSON definition of the layer.  Bud_0-1777902185834.png   Is that where you got yours too, or am I missing something in the main Admin REST API page?   Also, a couple of observations: This technique doesn't seem to back-populate existing rows properly, when nullable:false. The existing rows will all be set to the same value — the largest OBJECTID. I suppose this could be corrected with a field calculation if the field is editable. Bud_5-1777901515742.png Edit: I wonder if we should keep an eye on this in other scenarios. Are there any gotchas? For example, what happens if we bulk load or populate rows? Will it populate the IDs correctly, or will they all be the same value (the largest OBJECTID)? I ended up disabling editing on this field because when editable:true (and when nullable:true), the web map Edit pane was setting the field to null, overriding the default value. Bud_2-1777901031771.png Bud_3-1777901107350.png   This is what I settled on: { "fields": [ { "name" : "unique_id", "type" : "esriFieldTypeInteger", "alias" : "Unique ID", "sqlType" : "sqlTypeOther", "nullable" : true, "editable" : false, "visible" : true, "domain" : null, "defaultValue" : "IDENT_CURRENT('db_2xxxx.user_2xxxx.test_layer_TEST_LAYER')" } ] } Bud_4-1777901316009.png   ... View more

I was playing around with default values in a integer column in a hosted feature layer. 1+1 worked as a default value: { "fields": [ { "name" : "MyID6", "type" : "esriFieldTypeInteger", "alias" : "My ID 6", "sqlType" : "sqlTypeOther", "length" : 38, "nullable" : false, "editable" : false, "domain" : null, "defaultValue" : "1+1" } ] } Bud_0-1777870771345.png   But when I tried OBJECTID+1, I got an error message: { "fields": [ { "name" : "MyID7", "type" : "esriFieldTypeInteger", "alias" : "My ID 7", "sqlType" : "sqlTypeOther", "length" : 38, "nullable" : false, "editable" : false, "domain" : null, "defaultValue" : "OBJECTID+1" } ] } The name \"OBJECTID\" is not permitted in this context. Valid expressions are constants, constant expressions, and (in some contexts) variables. Column names are not permitted. Bud_2-1777870922718.png I googled the second sentence of that error message, and it appears to be a SQL Server message.  This message is a specific SQL Server error (Msg 128) that occurs when you attempt to use a column name in a database context where it is not allowed, such as within a DEFAULT constraint or during a data insertion where string quotes are missing. Using Columns in Default Constraints: You cannot set a column's DEFAULT value to equal the value of another column in the same table. https://share.google/aimode/tmot43yg8Iehd54KU  So I guess that's more evidence that we're dealing with SQL Server? Additionally, I've seen some JSON examples online that have "defaultValue": "GetDate() WITH VALUES".  GetDate() appears to be a SQL Server thing too. ... View more

Would someone with DBA privileges in an on-prem Portal datastore database be able to poke around in a table to see if there are any database sequences used that would also be available in AGOL? (This is more of an “out of curiosity” thing to see if we can learn anything interesting, not necessarily something that should be done in a mission-critical AGOL feature layer without testing.) ... View more

Idea: Expression field in advanced AGOL view without join ... View more

Based on comments in Support for Attribute rules in ArcGIS Online: @Allison_Hockey  @IvanKozoletov1  @PaulBarr  @RichardLittlefield  @KevinMayall  @CalvinHarmin  @LeviCecil might find this post interesting.   You might also like Expression field in view using AGOL UI.   Also: Since you mentioned Survey123 if you are using Connect, there is uuid() function you can use to populate a unique id https://community.esri.com/t5/arcgis-online-questions/auto-populate-unique-id-field-in-hosted-feature/m-p/1698270/highlight/true#M68512  And Understanding Relationship Classes in ArcGIS Online Hosted Feature Services ... View more

For anyone who’s interested, it sounds like we can add calculated expression fields to “advanced views” in AGOL via the Admin REST API. The view would be uneditable. And this only seems to work for views with joins. Add to Definition (Feature Service) "sourceLayerFields": [ { "name": "zipcode", "source": "zipcode" }, { "name": "salesavg", "alias": "SaleAveragePerCustomer", "expression": "(Total_Sales_FY13 + Total_Sales_FY14) / Customers", "type": "esriFieldTypeDouble" } ] Abdillahi Hassan shows it in a video on LinkedIn: https://www.linkedin.com/posts/abdillahi-hassan-56a020134_esri-arcgis-ugcPost-7360636518803152896-NnkQ/  That’s not the same as attribute rules. But is related. Ideas: Expression field in view using AGOL UI Expression field in advanced AGOL view without join ... View more

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