InstantForum.NET v4.1.4CapableObjects Forumshttp://www.capableobjects.com/apps/InstantForum414/forums@capableobjects.comWed, 08 Feb 2012 22:54:59 GMT20http://www.capableobjects.com/apps/InstantForum414/Topic4916-4-1.aspxI had a trial with a derived attribute of type collection(string) and was amazing that it works fine. In earlier ECO versions we could use only simple types for attributes. Now I could get attribute values at run time. As you mentioned model validator throws the error message, but I gues you can ignore it.Wed, 03 Mar 2010 18:40:09 GMTefimhttp://www.capableobjects.com/apps/InstantForum414/Topic4916-4-1.aspxHi,<br>you can always use commaList, that coverts collection of string to comma separated list.Wed, 03 Mar 2010 09:11:25 GMTAlex Vedmedenkohttp://www.capableobjects.com/apps/InstantForum414/Topic4916-4-1.aspxI would be happy with a string[], but when I try that for a derived attribute of type String[] with this OCL:</P><P>self.Orders.M3Id</P><P>I get this during Validate Model:</P><P>MVE209 Invalid DerivationOCL: Type mismatch: Expected System.String[] got Collection(System.String). Expression: "self.Orders.M3Id" [Delivery.OL]</P><P>Also, I only get this validation error in the PMP designer Validate Model tool button - Show Model Errors in Modlr does not report it.</P><P>Second also, I do realize that I can (and should, and am now) get what I want via the derived association Orders but I was trying something fancy because I just wanted a list of Order ID's. I am just reporting what appears to be a small hole.Tue, 02 Mar 2010 22:00:59 GMTRickWeyrauchhttp://www.capableobjects.com/apps/InstantForum414/Topic4916-4-1.aspxAttributes can't have types that can be modified. Your alternative is to use string[]. <br>Tue, 02 Mar 2010 14:26:05 GMTJonas Hogstromhttp://www.capableobjects.com/apps/InstantForum414/Topic4916-4-1.aspxI am getting this error when I try to make a derived attribute of List&lt;String&gt; and Ocl that returns a Collection&lt;String&gt;. It all compiles but Eco does not seem to be able to really do it. See attached picture for model.</P><FONT size=1><P>Model Validation| Exception has been thrown by the target of an invocation.</P><P>| System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---&gt; System.InvalidOperationException: Model not Ecoified</P><P>| Attribute PickList.OrdersSet has an invalid type: System.Collections.Generic.List`1[System.String]. Only arrays, enums, strings and valuetypes are allowed</P></FONT>Sun, 28 Feb 2010 18:41:15 GMTRickWeyrauch