Ouch Rx

Library wrapping PouchDB with rxjs observables.

Usage

To use Ouch Rx one have to wrap database object with Ouch instance and then use its methods to create Observables and Observers.

const {Ouch} = require('ouch-rx');
const ouch = new Ouch(db);
ouch.all().pipe(transform).subscribe(ouch.sink())

Reference

Constructor

Wraps single pouchdb database.

new Ouch(db)

Argument	Description
db	A PouchDB database

Methods

all

Returns observable of all documents.

ouch.all(options)

Argument	Description
options	An options object passed to db.all_docs. The following fields are not passed: include_docs

changes

Returns observable of a change feed.

ouch.changes(options)

Argument	Description
options	An options object passed to db.changes.

view

Returns observable of view results.

ouch.view(name,options)

Argument	Description
name	A view name
options	An options object passed to db.query. The following fields are not passed: include_docs

To use this method the db object must support query method.

sink

Returns observer that writes incoming objects into db.

The operation will fail on any error so it is useful for inserting completely new documents and for updating documents previously fetched from db (so current _rev is known).

ouch.sink()

merge

Returns observer that writes incoming objects into db.

The operation will call the merge function with incoming object to prepare document to store. The operation will call the merge function again with incoming object and current document state if conflict is encountered. It will then retry write with the result of merge function.

ouch.merge(mergeFunction)    

Argument	Description
mergeFunction	A merge function (object,current) => document to store

Merge Functions

The following ready to use merge functions are provided

• skip - if document exist in database then skip update
• override - override document in database with new document
• assign - merge the existing and new document the way that uses new properties over existing but leave existing properties if new values are not provided. The merge is shallow, it considers only top level properties.