RealmCollectionType

public protocol RealmCollectionType: CollectionType, CustomStringConvertible

A homogenous collection of Objects which can be retrieved, filtered, sorted, and operated upon.

Properties

  • Element type contained in this collection.

    Declaration

    Swift

    typealias Element: Object
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  • The Realm the objects in this collection belong to, or nil if the collection’s owning object does not belong to a realm (the collection is standalone).

    Declaration

    Swift

    var realm: Realm? { get }
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  • Returns the number of objects in this collection.

    Declaration

    Swift

    var count: Int { get }
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  • Returns a human-readable description of the objects contained in this collection.

    Declaration

    Swift

    var description: String { get }
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Index Retrieval

  • Returns the index of the given object, or nil if the object is not in the collection.

    Declaration

    Swift

    func indexOf(object: Element) -> Int?

    Parameters

    object

    The object whose index is being queried.

    Return Value

    The index of the given object, or nil if the object is not in the collection.

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  • Returns the index of the first object matching the given predicate, or nil no objects match.

    Declaration

    Swift

    func indexOf(predicate: NSPredicate) -> Int?

    Parameters

    predicate

    The NSPredicate used to filter the objects.

    Return Value

    The index of the first matching object, or nil if no objects match.

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  • Returns the index of the first object matching the given predicate, or nil if no objects match.

    Declaration

    Swift

    func indexOf(predicateFormat: String, _ args: AnyObject...) -> Int?

    Parameters

    predicateFormat

    The predicate format string, optionally followed by a variable number of arguments.

    Return Value

    The index of the first matching object, or nil if no objects match.

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Filtering

  • Returns Results containing collection elements that match the given predicate.

    Declaration

    Swift

    func filter(predicateFormat: String, _ args: AnyObject...) -> Results<Element>

    Parameters

    predicateFormat

    The predicate format string which can accept variable arguments.

    Return Value

    Results containing collection elements that match the given predicate.

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  • Returns Results containing collection elements that match the given predicate.

    Declaration

    Swift

    func filter(predicate: NSPredicate) -> Results<Element>

    Parameters

    predicate

    The predicate to filter the objects.

    Return Value

    Results containing collection elements that match the given predicate.

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Sorting

  • Returns Results containing collection elements sorted by the given property.

    Declaration

    Swift

    func sorted(property: String, ascending: Bool) -> Results<Element>

    Parameters

    property

    The property name to sort by.
    ascending

    The direction to sort by.

    Return Value

    Results containing collection elements sorted by the given property.

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  • Returns Results with elements sorted by the given sort descriptors.

    Declaration

    Swift

    func sorted<S: SequenceType where S.Generator.Element == SortDescriptor>(sortDescriptors: S) -> Results<Element>

    Parameters

    sortDescriptors

    SortDescriptors to sort by.

    Return Value

    Results with elements sorted by the given sort descriptors.

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Aggregate Operations

  • Returns the minimum value of the given property.

    Warning

    Only names of properties of a type conforming to the MinMaxType protocol can be used.

    Declaration

    Swift

    func min<U: MinMaxType>(property: String) -> U?

    Parameters

    property

    The name of a property conforming to MinMaxType to look for a minimum on.

    Return Value

    The minimum value for the property amongst objects in the collection, or nil if the collection is empty.

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  • Returns the maximum value of the given property.

    Warning

    Only names of properties of a type conforming to the MinMaxType protocol can be used.

    Declaration

    Swift

    func max<U: MinMaxType>(property: String) -> U?

    Parameters

    property

    The name of a property conforming to MinMaxType to look for a maximum on.

    Return Value

    The maximum value for the property amongst objects in the collection, or nil if the collection is empty.

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  • Returns the sum of the given property for objects in the collection.

    Warning

    Only names of properties of a type conforming to the AddableType protocol can be used.

    Declaration

    Swift

    func sum<U: AddableType>(property: String) -> U

    Parameters

    property

    The name of a property conforming to AddableType to calculate sum on.

    Return Value

    The sum of the given property over all objects in the collection.

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  • Returns the average of the given property for objects in the collection.

    Warning

    Only names of properties of a type conforming to the AddableType protocol can be used.

    Declaration

    Swift

    func average<U: AddableType>(property: String) -> U?

    Parameters

    property

    The name of a property conforming to AddableType to calculate average on.

    Return Value

    The average of the given property over all objects in the collection, or nil if the collection is empty.

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Key-Value Coding

  • Returns an Array containing the results of invoking valueForKey(_:) using key on each of the collection’s objects.

    Declaration

    Swift

    func valueForKey(key: String) -> AnyObject?

    Parameters

    key

    The name of the property.

    Return Value

    Array containing the results of invoking valueForKey(_:) using key on each of the collection’s objects.

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  • Invokes setValue(_:forKey:) on each of the collection’s objects using the specified value and key.

    Warning

    This method can only be called during a write transaction.

    Declaration

    Swift

    func setValue(value: AnyObject?, forKey key: String)

    Parameters

    value

    The object value.
    key

    The name of the property.
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