Constrain Your Data Using XPath 3 Flashcards
What is an Enumeration?
An Enumeration is an attribute with a pre-defined list of string values. They can be selected within a dropdown or from a radio button, and they make it easy to keep data consistent. On the database level, enumerations are simply strings. The Mendix platform provides assistance when creating XPaths with enumeration values.
Why are Enumerations useful?
Enumerations are useful because they help maintain data consistency by providing a set of predefined values that can be selected. This ensures that data is entered in a standardized way, reducing errors and improving data quality. Enumerations also make it easier to work with data in Mendix by simplifying the process of creating XPath queries and constraints involving these values.
What are Mendix System Variables?
Mendix System Variables are predefined variables in the Mendix platform that can be used in XPath expressions. They include references to the current user, user roles, session information, dates, and times, providing greater control over data queries and constraints.
What is the ‘[%CurrentObject%]’ variable used for?
The ‘[%CurrentObject%]’ variable represents the unique identifier of the current context object. In practical terms, it refers to the object within the context, such as the object of a Data View. It is used to specify the context object when creating XPath expressions.
What is the ‘[%CurrentUser%]’ variable used for?
The ‘[%CurrentUser%]’ variable is used to refer to the current user of the Mendix application. It can be utilized in various locations where XPath expressions are used, including security constraints. However, it should not be used in system processes like Scheduled Events and After Startup microflows when there is no user context.
