What are polymorphic fields?
A polymorphic field is one where the related object might be one of several different types of objects. For example, the Who relationship field of a Task can be a Contact or a Lead.
What is an example of polymorphic lookup field in Salesforce?
Salesforce makes use of polymorphic relationship fields for native lookup fields that can reference multiple objects. The most common fields that use polymorphic relationships are Owner fields and Activity WhatId/WhoId fields.
How do I display a LookUp field in PowerApps?
Select the form. Select a data card in the form for one of the lookup columns; a data card is the box that holds the controls for each field. Go to its Default property; this determines the value it shows.
What is polymorphism in relation?
A polymorphic relationship is where a model can belong to more than one other model on a single association. To clarify this, let’s create an imaginary situation where we have a Topic and a Post model. Users can leave comments on both topics and posts. With polymorphic relationships, we don’t need two tables.
When to use typeof in a polymorphic statement?
Use TYPEOF in a SELECT statement to control which fields to query for each object type in a polymorphic relationship. The following SELECT statement returns a different set of fields depending on the object type associated with the What polymorphic relationship field in an Event.
How to use polymorphic fields in a query?
You can use polymorphic fields several ways. You can use the polymorphic field for the relationship. You can use the Type qualifier on a polymorphic field. You can use a TYPEOF clause in a query. You can also combine these techniques for complex queries.
How to filter the object type of a polymorphic relationship?
You can filter on the object type of a polymorphic relationship using the Type qualifier in a WHERE clause, see Filtering on Polymorphic Relationship Fields for more details. TYPEOF isn’t allowed in queries that don’t return objects, such as COUNT () and aggregate queries.
How to create a polymorphic relationship in soql?
SOQL supports polymorphic relationships using the TYPEOF expression in a SELECT statement. TYPEOF is available in API version 46.0 and later. (It is also available in API version 26.0 and later as part of a Developer Preview.) Use TYPEOF in a SELECT statement to control which fields to query for each object type in a polymorphic relationship.