Adding and Editing Data

Exposes functionality that allows you to perform multiple operations on the store within a single write transaction.

You must use the scoped method to get collection-scoped access to the write transaction object, which will then allow you to perform insert, update, remove or evict operations using the write transaction.

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@interface DITWriteTransaction : NSObject

Defines the various strategies available when inserting a document into a collection.

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enum DITWriteStrategy : NSUInteger {}

Exposes functionality that allows you to perform multiple operations on the store within a single write transaction.

A DITScopedWriteTransaction is scoped to a specific collection, obtained by calling scoped on a DITWriteTransaction.

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@interface DITScopedWriteTransaction : NSObject

These objects are returned when using find and findAll functionality on DITScopedWriteTransactions.

You can use them to perform updates on documents and remove or evict documents.

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@interface DITWriteTransactionPendingCursorOperation : NSObject

These objects are returned when using findByID functionality on DITScopedWriteTransactions.

You can use them to perform updates on a document and remove or evict a document.

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@interface DITWriteTransactionPendingIDSpecificOperation : NSObject

These objects are returned when calling collections on DITStore.

They allow chaining of further collections-related functions. You can either call exec on the object to get an array of DITCollections as an immediate return value, or you can establish either a live query or a subscription, which both work over time.

A live query, established by calling observeLocal, will notify you every time there’s a change in the collections that the device knows about.

A subscription, established by calling subscribe, will act as a signal to other peers that you would like to receive updates from them about the collections that they know about.

Typically, an app would set up a subscribe in some part of the application which is long-lived to ensure the device receives updates from the mesh. These updates will be automatically received and written into the local store. Elsewhere, where you need to use this data, an observeLocal can be used to notify you of the data, and all subsequent changes to the data.

If you want to observe changes in such a way that you can signal when you’re ready for the live query to deliver a new update then you can call observeLocalWithNextSignal.

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@interface DITPendingCollectionsOperation : NSObject

Provides information about a successful update operation on a document.

The update result can be one of the following types:

• set
• removed
• incremented

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@interface DITUpdateResult : NSObject

The types of update result.

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enum DITUpdateResultType : NSUInteger {}

Provides information about the result of an operation on a document that was part of a write transaction.

The write transaction result can be one of the following types:

• inserted
• removed
• evicted
• updated

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@interface DITWriteTransactionResult : NSObject

The types of write transaction results.

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enum DITWriteTransactionResultType : NSUInteger {}