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Dependent List of Values
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One feature in which model driven lists of values and view criteria can work together is a dependent list of values. A dependent list of values is one where the rows in the list of values are dependent on some factor. For example, the list of people who can be an employee s manager is limited to employees who are within that person s department.
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More View Object Features
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In this case, a view criteria can be applied to a model driven list of values to filter the rows to show only employees in the selected department.
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Creating a Dependent Model Driven List of Values
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Let s implement the previously mentioned example in which a manager must be in the same department as his or her employee. So in this case, the DepartmentId of the selected employee limits the list of possible managers that will appear in the list.
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Creating the View Criteria
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The first step is to create a view criteria that will filter the view of employees based on DepartmentId. Open the view object editor for EmployeesView, select the Query tab, and create a new view criteria called EmpInDeptViewCriteria. For this view criteria, the condition DepartmentId is equal to a bind variable of type Number. By using a bind variable, the view criteria can be parameterized by passing in the DepartmentId of the selected employee.
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Creating the Dependent Model Driven List of Values
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The next step is to create the model driven list of values. In this case, create a list of values on the ManagerId attribute of the EmployeesView view object where the List Data Source is EmployeesView and List Attribute is EmployeeId. Select the UI Hints tab and set Default List Type to Input text with List of Values.
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It s at this point that the instance of the view object that is providing the list of values, List Data Source, should have the view criteria applied that will filter the list based on DepartmentId. To do this, click the green plus next to List Data Source to open the View Accessors dialog.
The View Accessors dialog allows you to apply the view criteria to the data that will appear in the list of values. Click Edit and move EmpInDeptViewCriteria from the Available list to the Selected list. The bind variable also needs to be set, so for Value input DepartmentId. By doing this, you are defining that the bind variable, which is being used to filter the list of employees, should have a value, which is the currently selected employee s DepartmentId.
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NOTe The DepartmentId specified earlier is in fact a Groovy expression, albeit a very simple one consisting of only the name of an attribute. You can now select the appropriate application module and test it in the ADF Business Component Browser. Select an employee and click the List of Value button to the right of ManagerId. The list of values for a new manager is now restricted to only those employees in the currently selected employee s department.
Summary
In this chapter you have utilized some of the more advanced features of view objects to implement features for your application. You have learned how to: Set up filter conditions using view criteria. Use view criteria to filter instances of view objects within an application module. Use a view criteria as the tool for end user filtering of data. Define a list of valid values for a view object attribute. Filter a list of values based on a view criteria.
Now that you have finalized the shape of your business service, the final step is to add some application-specific business rules. The next chapter guides you through the rich declarative validation features of ADF Business Components and shows how you can start adding business and data validation logic to your application.
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