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What is calculated attributes in OutSystems?
There are situations when the data fetched from the database isn’t enough and you need to add more information to each record, namely based on the values returned. OutSystems allows you to do it.
What is a calculated attribute?
A Calculated Attribute (CA) is a read-only value about a single user, providing granular insight into user behavior. These attributes are defined in mParticle and are computed automatically over time by using the raw data stream of events and user information.
How do you use aggregate in Outsystems?
Follow the steps:
- Right-click a Screen or a Block and select Fetch data from Database.
- With the Aggregate still open, navigate to Data > Entities > Database.
- Drag one of the Entities to the Aggregate window.
- Go back to your Screen or Block and set an element to use the data.
Which attribute can be computed from other attributes?
Calculated attributes use formulas to derive their values from the values of other attributes. These formulas can use both attribute and literal values to compute or generate a derived attribute value.
Which attribute’s value is calculated from other attributes?
Derived Attribute
A derived attribute is an attribute whose values are calculated from other attributes. In a student table if we have an attribute called as date_of_birth and age.
What is a composite attribute give examples?
A typical example of a composite attribute is a person’s address, which is composed of atomic attributes, such as City, Zip, and Street.
How to define an attribute in core data model?
To define an attribute, select it in the Core Data model editor and specify values in the Attribute pane of the Core Data Model inspector; see Attribute pane in the Data Model inspector.
How are managed objects used in core data?
In general, the richer the model, the better Core Data is able to support your application. A managed object model allows Core Data to map from records in a persistent store to managed objects that you use in your application. The model is a collection of entity description objects (instances of NSEntityDescription ).
How is custom class implemented in managed object model?
In many cases, you also implement a custom class to correspond to the entity from which classes representing the subentities also inherit. Rather than implementing business logic common to all the entities several times over, you implement them in one place and they are inherited by the subclasses.