Selector Layer

The selector layer is home to all queries for a given object. This encourages reuse of queries and builds a central place for adjusting the fields used from the object.

The selector layer offered by FFLIB brings things together and offers:

• Centralised place for queries with common fields.
• Allows joining other selectors so we can select common fields from other objects through relationship fields or even sub-selects.
• Provides security checks to ensure that the user has access to a given sObject and all of the fields. If required, this can be disabled.

Naming Conventions

Given the reusability of the selector classes, it is recommended to name them as the sObject name followed by Selector (whilst excluding the __c for custom objects):

• Knowledge__kav → KnowledgeSelector.cls
• Account → AccountSelector.cls
• PortalUser__c → PortalUserSelector.cls