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Calculating Based on Attributes from a Different View Object
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So far, the transient attribute values in the previous two examples have come from attributes in the same view object. However, what if you want to access an attribute in a different view object
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Suppose you would like to have information about the average order for a particular customer. That means you have to access OrderTotal in the OrdersView view object to perform this calculation. How can you access attributes of OrdersView from CustomersView The answer is to use accessors.
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A Quick Overview of Accessors 5 briefly touched on the concept of accessors when introducing associations. An accessor, as the name implies, provides a means of accessing one view object from another view object. If you look at the view object editor, you will see a tab View Accessors where you can explicitly define which other view objects this view object can access. However, view links implicitly define view accessors as the way of defining the master/detail link between two view objects. So, if you have view links linking two view objects, you shouldn t need to explicitly create accessors. View links and accessors are covered in more detail later in this chapter. Creating the Attribute Create a new transient attribute CustOrderAvg of type Number in CustomersView, and set Value to be an expression OrdersView.avg("OrderTotal"). So, what have you just done Well, the expression you have just written is a notation called Groovy, which was touched on in 5 and will be more fully explored later, in 9. The notation has a built-in function avg that takes a parameter representing the name of the attribute to be averaged. To complete the expression, a view accessor name is used to indicate which view object is accessed from the current view object to perform the operation. The view accessor is defined in the view link OrdersCustomerIdFkLink, and provides a handle to access the source or the destination view object at either end of a view link. So the OrdersView accessor allows CustomersView to access the OrdersView view object.
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NOTe By default the accessor, OrdersView, has the same name as the view object it refers to. Just remember that the expression you are using is based on the accessor name, not the view object name. If you were to change the name of the accessor to OrdersAccessor, then the expression would have to change to OrdersAccessor. avg("OrderTotal"). Run and test in the ADF Business Component Browser and check that the new attribute shows the average order for each customer.
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Now that you have fine-tuned your view objects to bring back the right data in the right order, the next step is to link these views together to give the correct hierarchy to the business service. View links provide the ability to describe a master/detail relationship between two view objects. The view link defines a source attribute in the master view object and the corresponding destination attribute in the detail view object. So you can have a view object OrdersView that shows all orders, but if you want to see only the orders for a specific customer, then you would require a view link to link OrdersView to CustomersView.
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When you used the Create Business Components from Tables wizard in 4, JDeveloper created a number of view links based on the relationships between the tables. Referring back to Figure 6-4, you can see the view links, the view link names, and the view objects for which a relationship is defined. For this application, the Create Business Components from Tables wizard pretty much created all the view links required. In fact, there may be some view links you don t need. For example, OrdersSalesRepFKLink defines a master/detail relationship between EmployeesView and OrdersView. This would be useful if you want to see all the orders for which an employee is the sales rep, but this is not something that will be required in this application. You will probably want to delete any view links that are not required, but there is no harm in keeping them while you are still experimenting with the features of the framework. However, there are two relationships for which view links don t currently exist. What if you want to view the employees in a specific department Or what if you want to view the stock levels in your warehouses for a specific order item Referring back to Figure 6-4, you can see that there is no view link linking DepartmentsView to EmployeesView or linking OrderItemsView to InventoriesView. This means that your business service, as it stands, can t show the employees within a specific department or the inventory level for a specific order item. So let s have a look at how to create these view links. NOTe Using the Create Business Components from Tables wizard on the Employees and Departments tables would automatically create view links based on the foreign key constraints. As you might have guessed, there are a number of different ways to create a view link; however, it doesn t matter which method you choose. Here are two options.
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