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Eduard Lebedyuk · Jul 23, 2021

Datatype classes are used to define object properties, they allow to:

  • Validate values both generic (for example any defined %Integer property by default checks that it's value is an integer) and based on datatype parameters (for example you can have an %Integer(MINVAL=0, MAXVAL=9) property which in addition to checking that it's value is an integer would check that integer value is between 0 and 9)
  • Provide different representations based on context, specifically:
    • Logical (what's stored in globals)
    • Display (what's shown in object)
    • XSD (for XML export/import)
    • ODBC (returned in SQL)
  • Provide generators for utility methods. Article on some examples.

Docs.

Eduard Lebedyuk · Jul 22, 2021

Here's an example:

Class User.Assert Extends Ens.BusinessProcess [ ClassType = persistent, Language = objectscript ]
{

Method OnRequest(pRequest As Ens.Request, Output pResponse As Ens.Response) As %Status
{
    Set pResponse = ##class(Ens.Response).%New()
    
    $$$LOGINFO("$$$ASSERT(1)")
    $$$ASSERT(1) // skipped
    
    $$$LOGINFO("$$$LOGASSERT(1)")
    $$$LOGASSERT(1)
    
    $$$LOGINFO("$$$ASSERT(0)")
    $$$ASSERT(0)
    
    $$$LOGINFO("$$$LOGASSERT(0)")
    $$$LOGASSERT(0)

    Quit $$$OK
}
}
Eduard Lebedyuk · Jul 17, 2021

There are two ways to do that:

1. Mappings. Map classes and globals into the namespace you're querying from. This would work if there's no global/class collisions of course.

2. Custom queries. Here's an article on the topic. And here's an example.

3. Just set $namespace before running your query. Works only if you need to query one other namespace at a time. Example.

Eduard Lebedyuk · Jul 12, 2021

Article idea: Building IRIS images with Docker Build Mounts

From the docs on Docker Build Mounts:

RUN --mount allows you to create mounts that process running as part of the build can access. This can be used to bind files from other part of the build without copying, accessing build secrets or ssh-agent sockets, or creating cache locations to speed up your build.

This is a recent Docker feature allowing users to build compact images (since we no longer need to COPY everything inside). Try it out and write an article about it?