Class

NSExpressionDescription

A special property description type intended for use with a fetch request.

Declaration

@interface NSExpressionDescription : NSPropertyDescription

Overview

An NSExpressionDescription describes a column to be returned from a fetch that may not appear directly as an attribute or relationship on an entity. Examples might include upper(attribute) or max(attribute). You cannot set an NSExpressionDescription object as a property of an entity.

Topics

Getting Information About an Expression Description

expression

The expression for the receiver.

expressionResultType

The type of the receiver.

Relationships

See Also

Specifying Fetch Constraints

predicate

The predicate of the fetch request.

fetchLimit

The fetch limit of the fetch request.

fetchOffset

The fetch offset of the fetch request.

fetchBatchSize

The batch size of the objects specified in the fetch request.

affectedStores

An array of persistent stores specified for the fetch request.

NSFetchRequestExpression

An expression that evaluates the result of a fetch request on a managed object context.

NSFetchedPropertyDescription

A description object used to define which properties are fetched from Core Data.