Working with Data Models › Working with Transformations › Overview of Transformations in r8 › Migrating r7.x Models to r8 Models

Migrating r7.x Models to r8 Models

Because of the nature of the transforms conversion between r7 and r8, the r8 model will no longer have the transform objects and the source or target objects of all transforms. So a Complete Compare between an r7 model and the same model that was round tripped to r8 and back will show significant differences in r7.

On the other hand, a model originated in r8 will lose all the Link objects in the process of being converted to r7. So a Complete Compare between an r8 model and the same model that was round tripped to r7 and back will show significant differences in r8 because of the missing Link objects.

Converting models created by a previous version of the product to a form readable by r8

When opening a r7.x file in r8 all pre-existing transforms will be reversed or resolved based on the options you specify. During the file open process you will be prompted to select the option you want, either Resolve All Transforms, Reverse All Transforms, or Convert Transforms into Current State.

This rule applies to the following r7.x transforms:

• Supertype-Subtype Roll Up
• Supertype-Subtype Roll Down
• Two Table Roll Up
• Two Table Roll Down
• Vertical Partitioning
• Horizontal Partitioning
• Many-to-Many
• Supertype-Subtype Identity

Note: If corruptions are identified and the transforms cannot be resolved because the switch to target view fails (assuming the transform was in source mode) then the transform will be reversed.

Column Denormalization transform conversion

The Column Denormalization transform will be converted into column level Link objects as follows:

• A Link object will be created for each Column Denormalization transform to link the two columns. Since all the properties were synched by the Column Denormalization transform (except for some reference properties), by default, the new Link object will be set to synch all properties except for the same reference properties excluded in Column Denormalization.
• The transform definition will be copied from the Column Denormalization transform to the new Link object. The transform name will be copied to the new Link object.
• The Link object direction property will be set based on the setting of the Reflect Changes Back To Source Object property of the Column Denormalization transform so it will be either From-this on the source column’s Link object and To-this on the target column’s Link object, or Two-way on both.