Ditto
These objects are returned when using find-like functionality on DittoCollections. They allow chaining of further query-related functions to do things like add a limit to the number of documents you want returned or specify how you want the documents to be sorted and ordered. You can either call exec on the object to get an array of DittoDocuments 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 an update to a document that matches the query you provided in the preceding find-like call. A subscription, established by calling subscribe, will act as a signal to other peers that the device connects to that you would like to receive updates from them about documents that match the query you provided in the preceding find-like call. Update and remove functionality is also exposed through this object.
Functions
Evict all documents that match the query generated by the preceding function chaining.
Execute the query generated by the preceding function chaining and return the list of matching documents.
Limit the number of documents that get returned when querying a collection for matching documents.
Enables you to listen for changes that occur on a collection. This won't subscribe to receive changes made remotely by others and so it will only fire updates when a local change is made. If you want to receive remotely performed updates as well then also call subscribe with the relevant query. The returned DittoLiveQuery object must be kept in scope for as long as you want the provided eventHandler to be called when an update occurs.
Enables you to listen for changes that occur on a collection, and to signal when you are ready for the live query to deliver the next event. This won't subscribe to receive changes made remotely by others and so it will only fire updates when a local change is made. If you want to receive remotely performed updates as well then also call subscribe with the relevant query. The returned DittoLiveQuery object must be kept in scope for as long as you want the provided eventHandler to be called when an update occurs.
Offset the resulting set of matching documents. This is useful if you aren't interested in the first N matching documents for one reason or another. For example, you might already have queried the collection and obtained the first 20 matching documents and so you might want to run the same query as you did previously but ignore the first 20 matching documents, and that is where you would use offset.
Remove all documents that match the query generated by the preceding function chaining.
Sort the documents that match the query provided in the preceding find-like function call.
Enables you to subscribe to changes that occur on a collection. Having a subscription acts as a signal to others that you are interested in receiving updates when local or remote changes are made to documents that match the query generated by the chain of operations that precedes the call to subscribe. The returned DittoSubscription object must be kept in scope for as long as you want to keep receiving updates.
Update documents that match the query generated by the preceding function chaining.