Enhance the Business Object Behavior With Determinations

Define the determination setStatusToOpen in the behavior definition of the Travel entity. This determination will be used to set the default value of the field OverallStatus to open (O) at the creation time new Travel instances.

1. Go to the behavior definition of the Travel BO entity

   
   ZRAP100_R_TravelTP_### and insert the following statement after the statement delete; as shown on the screenshot below:
   ABAP

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   determination setStatusToOpen on modify { create; }
   

   

   Short explanation:
   The statement specifies the name of the new determination, setStatusToOpen and on modify as the determination time when creating new travel instance ({ create }).

2. Save

   
   and activate
   
   the changes.

3. Now, declare the required method in behavior implementation class with ADT Quick Fix.

   Set the cursor on the determination name setStatusToOpen and press Ctrl+1 to open the Quick Assist view and select the entry Add method for determination setStatusToOpen of entity zrap100_i_travel_### in the view.

   As result, the FOR DETERMINE method setStatusToOpen will be added to the local handler class lcl_handler of the behavior pool of the Travel BO entity

   
   ZRAP100_BP_TRAVEL_###.
   

4. Save

   
   and activate
   
   the changes.

You are through with the definition of the determination.

You will now implement the logic of the defined determination in the behavior pool.

1. First check the interface of the method setStatusToOpen in the declaration part of the local handler class lcl_handler.

   For that, set the cursor on the method name, setStatusToOpen, press F2 to open the ABAP Element Info view, and examine the full method interface.

   

   Short explanation:

   • The addition FOR DETERMINE indicates that the method provides the implementation of a determination and the addition ON MODIFY indicates the specified trigger time.

   • IMPORTING parameter keys - an internal table containing the keys of the instances the determination will be executed on
     includes all entities for which keys must be assigned

   • Implicit CHANGING parameter reported - used to return messages in case of failure

   Now go ahead and implement the method in the implementation part of the local handler class.

2. Define the local constant travel_status to store the allowed value of the overall status of a Travel instance. Insert the following code snippet in the definition part of the local handler class lcl_handler as shown on the screenshot below.

   ABAP

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   CONSTANTS:
     BEGIN OF travel_status,
       open     TYPE c LENGTH 1 VALUE 'O', "Open
       accepted TYPE c LENGTH 1 VALUE 'A', "Accepted
       rejected TYPE c LENGTH 1 VALUE 'X', "Rejected
     END OF travel_status.    
   

   

3. Now implement the method setStatusToOpen in the implementation part of the class.

   The logic consists of the following steps:

   1. Read the travel instance(s) of the transferred keys (keys) using the EML statement READ ENTITIES

   2. The addition IN LOCAL MODE is used to exclude feature controls and authorization checks

   3. Removed all Travel instances where the overall status is already set

   4. Set the overall status to open (O) for the remaining entries using the EML statement MODIFY ENTITIES

   5. Set the changing parameter reported

   Insert the following code snippet in the method and replace all occurrences of the placeholder ### with your group ID.
   You can use the F1 help to get detailed information on each EML statement.

   ABAP

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   "Read travel instances of the transferred keys
   READ ENTITIES OF ZRAP100_R_TravelTP_### IN LOCAL MODE
    ENTITY Travel
      FIELDS ( OverallStatus )
      WITH CORRESPONDING #( keys )
    RESULT DATA(travels)
    FAILED DATA(read_failed).
   
   "If overall travel status is already set, do nothing, i.e. remove such instances  
   DELETE travels WHERE OverallStatus IS NOT INITIAL.     
   CHECK travels IS NOT INITIAL.
   
   "else set overall travel status to open ('O')
   MODIFY ENTITIES OF ZRAP100_R_TravelTP_### IN LOCAL MODE
     ENTITY Travel
       UPDATE SET FIELDS
       WITH VALUE #( FOR travel IN travels ( %tky    = travel-%tky
                                             OverallStatus = travel_status-open ) )
   REPORTED DATA(update_reported).
   
   "Set the changing parameter
   reported = CORRESPONDING #( DEEP update_reported ).   
   

   Your source code should look like this:

   

4. Save

   
   and activate
   
   the changes.

You can now preview and test the changes by creating a new travel instance in the Travel app.

1. Refresh your application in the browser using F5 if the browser is still open, or go to your service binding ZRAP100_UI_TRAVEL_O4_### and start the Fiori elements App preview for the Travel entity set.

2. Create a new Travel instance. The overall status should now be set automatically by the logic you just implemented.
   The initial overall status of the created should now be set to open (O).