CA ERwin Data Modeler r8 New Feature Guided Tours › Diagrams, Subject Areas, Layout, and Customization › Creating, Maintaining, and Working with Model Objects

Creating, Maintaining, and Working with Model Objects

Use the following steps to become familiar with creating, maintaining, and working with model objects.

1. Open an existing model or create a new model. Right-click on the diagram area and click Properties to launch the Diagram Editor. Click the Relationship tab.
2. Select the Display Logical Relationship Name and Display Physical Relationship Name properties on this tab if they are not already selected.
3. Click the Layout tab. Select the Show Callout property in the Visual Cues section and click Close.
4. Grab any relationship name on the diagram and move around. Observe the appearance of a dashed line which connects the relationship name to the relationship line on the diagram.
5. Reopen the Diagram Editor and click the Relationship tab again. Clear the Display Relationships check box and click Close. Observe that all the relationships in the current diagram are hidden.
6. Reopen the Diagram Editor and select the Display Relationships property again. Click the Members tab and ensure the Automatically populate from Subject Area property is not selected, and only the required entities/tables are included in the current diagram. Click the Relationships tab.
7. Include or exclude relationships for display in the current diagram by making the appropriate selections from the available relationships list on this tab. Exclude all the relationships from the diagram by clicking the Move all objects to Available Objects toolbar command under the Included Relationships section.
8. Select only one relationship from the list of Available Relationships and include it in the diagram by selecting Move selected objects to Included Objects toolbar command. Click Close and observe the effect of these changes on the diagram. Close the current model.
9. Create a new logical model and create two entities. Join the two entities with an identifying relationship. Create a third entity to the right of first two entities, and arrange the three entities so that they are spread out across in a horizontal line.
10. Grab the relationship line and try to spread its edges to the right, so that the relationship line loops around the third entity. Notice that in the process of expanding the relationship line, you will be able to create multiple bend points on the line. Play around with the relationship lines and close the model.