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#Object Data Model

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An object data model is that data or code is composed of modules that combine data and procedures that work on the data.

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Traditional Caché Objectscript has the multi-dimensional array as its main form of complex data structure and the $order command as the main means of traversing said data structures. But newer versions of Caché ObjectScript also have data structures that are direct parallels of what languages such as JavaScript provide, in the form of %DynamicObject and %DynamicArray. These have an easy to use iterator feature via the %GetIterator method, and even a handy built-in literal syntax for constructing new objects.

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I need to dynamically create a class based on a parameter passed into a class method. Basically the method takes in a string that contains the name of the class I need to create a new instance of.

I need something along these lines. 

ClassMethod someMethod(className As %String)
{
	set classObject = ##class(className).%New()

...
}

Trying to do this right results in a class not found error because it seems to be treating the variable as a literal string.

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How to convert SQL persistent classes to JSON output - I have tried 1 option but appears to be very lengthy process.

I have many other SQL storage's defined and have to expose them as well to JSON. Can anyone please suggest a better approach.

My column names usually match with my Json properties.

My User.TestClass is the class with GetJsonList() as my method to return /output JSON formatted data.

The Code tried and SQL storage structure are as follows -

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Here's an easy one for you; before I spend another hour looking for the answer, how do you convert %ArrayOfDataTypes to an array (that could, say, fit into the %session.Data array, or maybe just some array named info()), and of course back again?

NS>s aodt=##class(%ArrayOfDataTypes).%New()

NS>w aodt.SetAt("lcavanaugh","username")
1
NS>w aodt.SetAt("organization","coolcompany")
1
NS>w ##class(%ArrayOfDataTypes).BuildValueArray(aodt,.array)

<LIST>zBuildValueArray+1^%Library.ArrayOfDataTypes.1

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In writing some code on:

Cache for Windows (x86-64) 2015.1 (Build 429U) Fri Feb 13 2015 14:37:23 EST

I noticed an unexpected "ROLLFAIL" error when a Unique Index fail was generated in a %Save() call.

The object SHOULD fail to save, since the Unique criteria is not met, but I didn't expect to see a ROLLFAIL error as the "Last Error".

When running the following class code:

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Using the following...

//Get PDF stream object previously saved
   Set pdfStreamContainer = ##Class(Ens.StreamContainer).%OpenId(context.StreamContainerID)
   Try {
     Set pdfStreamObj = pdfStreamContainer.StreamGet()
   }
   Catch {
      $$$TRACE("Error opening stream object ID = "_context.StreamContainerID)
      Quit
   }

Would it be possible to search the pdfStreamObj for certain values like a Medical Record, or Patient Name?

Thanks

Scott

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Question
· Feb 28, 2016
Mocking tools for Unit Testing

Hello everyone!

Does anyone know of a library that can be used to create Mock objects for Objectscript classes?

Right now, my team has been building mock objects by hand to help circumvent dependencies when writing and executing unit tests, but I always wondered if someone had ever created a Mock library like Mockito to help quicken the process.

Thanks!

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Question
· Jan 14, 2018
Find last in a list of objects

I have a class to track data changes.
As it becomes slower and slower to find last changes I think I need an index.
The 2 classes are just simplified reality.
HowTo ?

Class Rick.ChangeItem Extends %SerialObject
{
Property Subject As %String;

Property Author As %String;

Property Change As %TimeStamp;
}

and

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Hi


I have been working on changing a web application from using %FileBinaryStream to storing and serving the file content from a %Stream.GlobalBinary property, stored in a new database. I have managed to migrate the data across, and have also been able to redirect the stream so that it is being served through the web link. However, the previous method set attributes on the File stream to have the stream be rendered as the original file type through MIME, using this code

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Hi-

I have created a class that extends %Persistent and %Populate and have set the various POPSPEC attributes of my properties to control how the properties are populated. However, when I compile the class and try to run the Populate() method it tells me the method isnt defined.

Here is the class definition:

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We are running old VB code on a Windows 2012 R2 server.

In the last month the following error has been happening.

Failure to create CacheObjectConnection.
Failure in GetClassInfo for CacheObjectConnection

Factory not connected to server
Send to Cache' failed

Neither the the code or Cache instance has not changed.

Cache 2017.1.1.111.0

The code:

Dim bRtn As Boolean
Dim objCacheObject As Object
cntr = 1

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Hello community!

I have a question about the %OnSave method of a class. We have a class that has two properties that are classes.

Class A

Class B

Class C

Class A.PropertyB as Class B

ClassA.PropertyC as Class C

Classes B and C also need to point back to Class A - it's just the way it is. We need to be able to use any one of these classes and get to the others (it's actually even more complicated than this, as Classes B and C also have a PropertyC and PropertyB as well, respectively) :

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