How to make use of Re Usable Objects

Question

Hi all,
I have created an application in Oracle Apex 3.2, and running fine. I want to include ReUsable Objects functionality in my application.
Our requirement is,
"Common Objects(eg LOVS,Validation,etc) should be written as common objects adn held in a "master" application that all applications refer through the SUBSCRIBE function. All common objects should NOT be copied into an application but subscribed from master application."
1) What does this "master" application mean?
2) How can we make use of subscribe function? and where can i find this subscribe function?
Can somebody help me in this regard by illustrating an example??
Thanks & Regards,
Sunil Bhatia

Answer 1

Here's an example.
I create a new application in APEX called Master with Application ID = 100. I modify some templates, create some LOV's in this master template.
I create a 2nd application in APEX called Subscriber with Application ID = 101.
In 101 I go to Shared Components => List of Values => Create. Choose to create as a copy of an existing list of values. In the dropdown, I choose Master (100) and click Next. You then are presented with all of the LOV's from your master application. First off you want to change the name from Copy of <LOV> to just <LOV> more because it is kind of confusing if you don't. In the copy drop-down, this where you choose Copy and Subscribe.
The way it works is that once an object subscribes, you always make changes to that object in Master (100), and there is a button to push that change to all subscribing applications. So if you have 30 applications subscribing to that one LOV, you just make the change once, push it to the subscribers and they are now up to date.
Keep in mind it doesn't work with all objects and only certain objects may be subscribed to. Objects like Application Processes for instance do not have a subscription feature, but you could use packages to keep common logic and just reference the same package anywhere you need it.
What I ended up doing was to create a master and a subscription application. The subscription template has no actual pages, just subscriptions to templates and LOV's that I need. Whenever I need a new application, I just create a new application as a copy of that subscription application and my subscriptions are already setup for me.
Check out the documentation and just search for Subscribe or Subscription and it should explain pretty much what I did above.