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NOTES.md

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Notes for Developers

  1. Most objects are a subclass of PersistentObject. Before you add new code to handle a specific object, think about whether or not that code can be made reusable for other objects. If so, it should probably go in the PersistentObject class.
  2. Most objects are associated with a Service. The Service can be considered the object's parent. PersistentObject provides two methods: Service() and Parent(). These are synonyms by default. In some cases, however, the parent of an object is not a service, but another object type. For example, the parent of VolumeAttachment is a Server, not a service. In these cases, the __construct() method of the child class should save the parent object and override the Parent() method to return it as opposed to the Service(). To continue with the VolumeAttachment example, using the Service() to construct a URL results in an incorrect Url.