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.
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What is a polymorphic field in Salesforce?
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. To determine what kind a field is, call describeSObjects () on the object and examine the properties for the field.
What is the object type of a polymorphic field in soql?
In the Enterprise and Tooling API WSDLs, the object type of a polymorphic field depends on the version of the API. In API version 46.0 and later (and in versions where the Developer Preview part of the SOQL Polymorphism feature is enabled), the object type is sObject.
What is a polymorphic field?
Some fields are relationship fields, which means they can be used to get information about a related object. And some of those relationship fields are polymorphic fields. A polymorphic field is one where the related object might be one of several different types of objects.
Is there a polymorphic key for custom fields?
As of now, polymorphic keys only exist as standard fields. See the idea – Custom Polymorphic Id field (WhoId/WhatId) Custom text field, mark as ExternalId for indexing purpose. UI control…probably would have to be custom visualforce + apex controller. Related Lists…again, custom visualforce + apex controller.
What is polymorphic lookup?
Multi-table lookups (also sometimes known as polymorphic lookups) allow the creation of a lookup in one table that looks up records in multiple other tables at once. This provides much greater flexibility in retrieving data within your environments.
What is polymorphic relationship in Salesforce?
A polymorphic relationship is a relationship where the referenced objects can be one of several different object types. For example, the What relationship field in an Event can reference an Account, or a Campaign, or an Opportunity.
How do I create a polymorphic lookup field in Salesforce?
You cannot create your own polymorphic lookups in Salesforce. You would need to create two separate lookup fields, one to Account and one to Opportunity. You can then, if you wish, use formula fields to pull in data from whichever lookup is populated.
Is rollup summary possible for lookup relationship without using code?
Unfortunately, roll-up summary fields are only available for objects in a Master-Detail relationship and are not available for those that have a Lookup relationship.
Which Java class programming technique shows the use of polymorphism?
Since both the definition are different in those classes, calc_grade() will work in different way for same input from different objects. Hence it shows polymorphism.
Can we create polymorphic fields 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.
What is ID in Salesforce?
WhatID in Salesforce refers to object type things. That would typically be an Account ID or an Opportunity ID. The WhatId represents nonhuman objects such as accounts, opportunities, campaigns, cases, or custom objects. WhatIds are polymorphic.
What is polymorphic field?
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. To determine what kind a field is, call describeSObjects () on the object and examine the properties for the field.
What is SOQL typeof?
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.)
Can typeof be used with a relationship field?
TYPEOF can’t be used with a relationship field whose namePointing attribute is false. TYPEOF can’t be used with a relationship field whose relationshipName attribute is false. TYPEOF is only allowed in the SELECT clause of a query.
Can you use a polymorphic field in a query?
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.
Can you use typeof in SOQL?
TYPEOF can’t be used in SOQL queries that are the basis of Streaming API PushTopics. TYPEOF can’t be used in SOQL used in Bulk API. TYPEOF expressions can’t be nested. For example, you can’t use TYPEOF inside the WHEN clause of another TYPEOF expression.
