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PART II
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Working with Classes and Objects
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You have already seen how objects can be re-sorted within a class in the Calendar Year Lookup example Classes and objects can also be renamed, deleted, hidden, and modified In manipulating an object, you can access these actions in a number of ways: Use the Edit pull-down menu to clear, hide, or modify properties and formats Select the item and then right-click to choose from various actions on the pop-up menu Double-click the item to bring up the object s Edit Properties dialog box
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A Better Universe
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The modifications described in the remainder of this section will generally use the rightclick approach
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Rename an Object
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Using the Test Fashion universe created in 7, you want to rename the class Calendar Year Lookup to Time 1 Select the class Calendar Year Lookup 2 Right-click and then choose Class Properties from the pop-up menu The following screen shows the initial class definition:
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3 Once you are in the Edit Properties dialog box, replace the current name in the Class Name box with Time 4 Click OK In the following screen, the Calendar Year Lookup class has been renamed Time, and class description information has been added Classes as well as objects can contain meaningful help text in the Description box Help text is an underutilized feature in many universes, even though it is fairly easy to extract via the universe strategies Power users or subject matter experts can also provide description information via spreadsheet files and object strategies (see 7) that can be easily imported into the universe
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Classes and Objects
PART II
Delete an Object
To delete a class or object, you can use the same three selection methods described earlier or two shortcut keys:
DELETE
Menu Equivalent Edit | Clear Cut
Explanation This deletes the class or object The only way to retrieve it again is to use the undo button This cuts the class or object and puts it in the MS Windows clipboard To retrieve the object again, use paste or CTRL-V
CTRL-X
Let s imagine the worst-case scenario: you accidentally deleted a class When you delete a class, all the objects in that class will also be deleted Designer warns you of this with the error message shown here With Clear or DELETE, the contents are not placed in the MS Windows clipboard Undo allows you to undo only the last action As the Clear was several steps ago, the undo button no longer can help you All is not lost Recall from 6, the section How Designer Works, that you are working on only a copy of the universe There is still a universe, with all the old object definitions, stored in the repository When you make a catastrophic mistake like this, you can re-import a copy of the universe from the repository, although you will lose all other changes you made during this Designer session
Part II:
A Better Universe
Given that DELETE doesn t add items to the Windows clipboard, I suggest you use Cut as often as possible so that you have a better recovery process in case you accidentally delete something important Keep in mind, though, that if you Cut an object and recover it with the Paste command, the object will be assigned a new object ID and will generate errors in any existing user reports that reference the object
Hide
Hidden classes and objects are items that appear to you as the designer in italics but that users do not see when creating queries against this universe Because the items still exist in the universe, they do take up space and will increase the size of the universe Some designers will hide items so that all columns within the data mart appear to the designer but not to the user I don t like this use of Hide because of the impact on universe size However, Hide is useful when you want to hide work in progress or if you wish to remove an object but want a transition period to ensure that the removed object will not create problems for the users You also may want to hide an object that users will never access directly but that you as the designer may reference in @WHERE or other object logic In the following example, I ve added the table ARTICLE_COLOR_LOOKUP; Designer automatically added the corresponding class and objects I don t want the users to see these items yet, as they are not in business terms, nor have I added my joins
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