Entity class rules help to assign classes to the entities at the table level. Any new entity created on the table gets that entity class automatically. Entity classes are used to tag your entities.

When you create an entity for a table, the class associated with that table automatically gets assigned to the entity. You can set a new rule for the entity class. Entity class rules provide the categories of the entities at the class level. The Entity class rules option is displayed under Lists in the workspace view. Click an Entity class rule to display its details.

The Details tab in the Entity class rules form displays the following information:
Table 1. Details tab in the Entity class rules page
Field Description
Table Name of the table that the entity class is associated with after creating an entity class rule.
Class Name of the entity class to be associated with the table that uses the new entity class rule.

Entity class rule filter

Entity class rule filter is added in the entity class rule page to provide additional filters. Earlier, records of a table can be associated to only one entity class. Using the entity class rule filter, you can associate different classes to the records of the same table.

The Entity class rule filter table displays the following information:
Table 2. Entity class rule filter
Field Description
Filter Priority

Filter priority is the range for the subclass. The class is populated in the entity form based on the priority given.
Subclass

Subclass is the child class of the parent class that is displayed in the details tab of entity class rules.
Filter Condition

Filter Condition is used to filter out the records of the table that defines the entity class rule.

For example, if there are two subclasses with different condition then the parent class is populated instead of the subclasses.
Note: The subclasses are displayed in the entity forms only if they meet the same filter condition.

Logic for assigning entity classes

Assume that there is a record in the cmdb_ci_linux_server table and an entity class rule associated to this table. The entity class rule has these class rule filters:

Figure 1. Entity class rule
Entity class rule

Scenario 1: If the entity's source record belongs to the cmdb_ci_linux_server table and matches all the conditions of the second filter, then the entity's class is auto-populated as sub class, Department.

Scenario 2: If the entity's source record belongs to the cmdb_ci_linux_server table and its name starts with lnux (satisfies both the filters), then the sub class Application is auto-populated as an entity class.

Scenario 3: If the entity's source record doesn't satisfy any of the class rule filters, then the class Linux Server is auto-populated as an entity class.