DITDocumentID
@interface DITDocumentID : NSObject <NSCopying>
An identifier for a DITDocument
.
Each DITDocumentID
represents a unique identifier for a document.
-
Initializes a new
DITDocumentID
.A document ID can be created from any of the following:
- string
- integer
- boolean
- null
- byte array
- array (containing any of the items in this list)
- map (where the keys must be strings and the values can be made up of any of the items in this list)
Note that you cannot use floats or other custom types to create a document ID.
Document IDs are also limited in size, based on their serialized representation, to 256 bytes. You will receive an error if you try to create a document ID that exceeds the size limit.
Declaration
Objective-C
- (nonnull instancetype)initWithValue:(nonnull id)idValue;
Parameters
idValue
The value that represents the document identifier.
-
The underlying value of the document identifier as a native type.
Declaration
Objective-C
@property (nonatomic, readonly) id _Nonnull value;
-
Returns a stringified representation of a document identifier.
The returned string can be used directly in queries that you use with other Ditto functions. For example you could create a query that was like this:
[myCollection find:[NSString stringWithFormat:@"_id == %@", [docID toString]];
Declaration
Objective-C
- (nonnull NSString *)toString;
Return Value
An
NSString
representation of the document identifier. -
Deprecated
use the
value
property instead.Returns a native representation of a document identifier.
Declaration
Objective-C
- (nonnull id)toNative;
Return Value
An
NSObject
representation of the document identifier. -
Compares two documents and determines whether or not they are equal.
Declaration
Objective-C
- (BOOL)isEqualToDITDocumentID:(nonnull DITDocumentID *)documentID;
Parameters
documentID
The other document identifier that you want to test equality with.
Return Value
A
BOOL
representing whether or not the document identifiers are equal. -
Compares two documents and determines their relative ordering.
Declaration
Objective-C
- (NSComparisonResult)compare:(nonnull DITDocumentID *)documentID;
Parameters
documentID
The other document identifier that you want to comapre against.
Return Value
An
NSComparisonResult
representing the ordering of the document identifiers when compared. -
Used to specify a path to a key in the document ID that you can subscript further to access a nested key in the document ID, if necessary.
Declaration
Objective-C
- (nonnull DITDocumentIDPath *)objectForKeyedSubscript:(nonnull NSString *)key;
Parameters
key
The initial part of the path needed to get to the key in the document ID you wish to get the value of.
Return Value
A
DITDocumentIDPath
object with the provided key incorporated into the document ID path. -
Used to specify an index in the array that represents the document ID. You can subscript the return value further to access a further nested key in the document ID, if necessary.
Declaration
Objective-C
- (nonnull DITDocumentIDPath *)objectAtIndexedSubscript:(NSUInteger)index;
Parameters
index
The index of the array representing the document ID that you wish to access.
Return Value
A
DITDocumentIDPath
object with the provided index incorporated into the document ID path.