Merge pull request #89 from olivierchatry/master

db can now be switched dynamically on the adapter

README.md

@@ -218,6 +218,31 @@ The value for `documentType` is the camelCase version of the primary model name.
 
 For best results, only create/update records using the full model definition. Treat the others as read-only.
 
+## Multiple databases for the same model
+
+In some cases it might diserable (security related, where you want a given user to only have some informations stored on his computer) to have multiple databases for the same model of data.
+
+`Ember-Pouch` allows you to dynamically change the database a model is using by calling the function `changeDb` on the adapter.
+
+```javascript
+function changeProjectDatabase(dbName, dbUser, dbPassword) {
+  // CouchDB is serving at http://localhost:5455
+  let remote = new PouchDB('http://localhost:5455/' + dbName);
+  // here we are using pouchdb-authentication for credential supports
+  remote.login( dbUser, dbPassword).then(
+    function (user) {
+      let db = new PouchDB(dbName)
+      db.sync(remote, {live:true, retry:true})
+      // grab the adapter, it can be any ember-pouch adapter.
+      let adapter = this.store.adapterFor('project');
+      // this is where we told the adapter to change the current database.
+      adapter.changeDb(db);
+    }
+  )    
+}
+```
+
+
 ## Installation
 
 * `git clone` this repository

addon/adapters/pouch.js

@@ -25,15 +25,35 @@ export default DS.RESTAdapter.extend({
   // reloading redundant.
   shouldReloadRecord: function () { return false; },
   shouldBackgroundReloadRecord: function () { return false; },
-
-  _startChangesToStoreListener: on('init', function () {
-    this.changes = this.get('db').changes({
-      since: 'now',
-      live: true,
-      returnDocs: false
-    }).on('change', bind(this, 'onChange'));
+  _onInit : on('init', function()  {
+    this._startChangesToStoreListener();
   }),
+  _startChangesToStoreListener: function () {
+    var db = this.get('db');
+    if (db) {
+      this.changes = db.changes({
+        since: 'now',
+        live: true,
+        returnDocs: false
+      }).on('change', bind(this, 'onChange'));
+    }
+  },
+  changeDb: function(db) {
+    if (this.changes) {
+      this.changes.cancel();
+    }
 
+    var store = this.store;
+    var schema = this._schema || [];
+
+    for (var i = 0, len = schema.length; i < len; i++) {
+      store.unloadAll(schema[i].singular);
+    }
+
+    this._schema = null;
+    this.set('db', db);
+    this._startChangesToStoreListener();
+  },
   onChange: function (change) {
     // If relational_pouch isn't initialized yet, there can't be any records
     // in the store to update.