Referencing ReadOnly property on Aurelius Entity in FMX

[Brett_Adam1 (Brett Adam)]

I have previously made progress on this problem with this post:

Adding a computed or "lookup" field to an Aurelius Entity

I have a set of Aurelius entities in a datamodel. This is working well. I would like to extend the Aurelius entities with additional properties which are not fields in the database, but which can be retrieved when a call for the entity occurs. Is there an attribute to add to the property to make it behave as a "readonly field" Which is pulled back with the database fields when .Find is called?

The suggestions in this post enabled me to return good JSON into my Browser.

However now I am trying to call the data into an FMX App I am getting an error.

--

[Entity]
[Table('People')]
[Id('FId', TIdGenerator.IdentityOrSequence)]
TPeople = class
private
[Column('ID', [TColumnProp.Required])]
FID: Integer;
... other properties here ...
[XDataProperty]
property Title: string read GetTitle;
end;

--

In my Broswer I call:

http://localhost:2001/xdata/People(25)

and JSON returns:

{
"$id": 1,
"ID": 25,
... other properties
"Title": "Mr"
}

--In FMX I call

var
oPeople: TPeople;
begin
for oPeople in XDataClient.List('$filter=(ID eq 25)') do
...
end

And get the following error:

GExperts Debugger Exception Notification
ExceptionMessage="Title"
ExceptionName="EPropReadOnly"
ExceptionDisplayName="EPropReadOnly"
ExceptionAddress=7FF99DC1543C
FileName=
LineNumber=
ExceptionObject=16B226418D0
Classes=[EPropReadOnly,Exception,TObject]

The application seems to be throwing an exception because of the presence of the property which is not read/write?

Even though the same call works OK returning JSON In the browser.

[wlandgraf (Wagner Landgraf)]

Yes, it's trying to set the value read from JSON into the Title property, and that fails because property is read-only. Define a writer for the property. even if it's a dummy SetTitle method that does nothing.

[Brett_Adam1 (Brett Adam)]

Brilliant. Thanks Wagner!