diff --git a/index.js b/index.js
index 997b90c7..cd292509 100644
--- a/index.js
+++ b/index.js
@@ -264,7 +264,9 @@ AbstractClass.prototype.save = function (callback) {
     var data = this.toObject();
     if (this.id) {
         this._adapter().save(modelName, data, function (err) {
-            if (!err) {
+            if (err) {
+                console.log(err);
+            } else {
                 this.constructor.call(this, data);
             }
             if (callback) {
@@ -296,7 +298,7 @@ AbstractClass.prototype.toObject = function () {
 AbstractClass.prototype.destroy = function (cb) {
     this._adapter().destroy(this.constructor.modelName, this.id, function (err) {
         delete this.constructor.cache[this.id];
-        cb(err);
+        cb && cb(err);
     }.bind(this));
 };
 
diff --git a/lib/memory.js b/lib/memory.js
new file mode 100644
index 00000000..b9299789
--- /dev/null
+++ b/lib/memory.js
@@ -0,0 +1,100 @@
+exports.initialize = function initializeSchema(schema, callback) {
+    schema.adapter = new Memory();
+};
+
+function Memory() {
+    this._models = {};
+    this.cache = {};
+    this.ids = {};
+}
+
+Memory.prototype.define = function defineModel(descr) {
+    var m = descr.model.modelName;
+    this._models[m] = descr;
+    this.cache[m] = {};
+    this.ids[m] = 1;
+};
+
+Memory.prototype.create = function create(model, data, callback) {
+    var id = this.ids[model]++;
+    data.id = id;
+    this.cache[model][id] = data;
+    callback(null, id);
+};
+
+Memory.prototype.save = function save(model, data, callback) {
+    this.cache[model][data.id] = data;
+    callback();
+};
+
+Memory.prototype.exists = function exists(model, id, callback) {
+    callback(null, this.cache[model].hasOwnProperty(id));
+};
+
+Memory.prototype.find = function find(model, id, callback) {
+    callback(null, this.cache[model][id]);
+};
+
+Memory.prototype.destroy = function destroy(model, id, callback) {
+    delete this.cache[model][id];
+    callback();
+};
+
+Memory.prototype.all = function all(model, filter, callback) {
+    var nodes = Object.keys(this.cache[model]).map(function (key) {
+        return this.cache[model][key];
+    }.bind(this));
+    process.nextTick(function () {
+        callback(null, filter && nodes ? nodes.filter(applyFilter(filter)) : nodes);
+    });
+};
+
+function applyFilter(filter) {
+    if (typeof filter === 'function') {
+        return filter;
+    }
+    var keys = Object.keys(filter);
+    return function (obj) {
+        var pass = true;
+        keys.forEach(function (key) {
+            if (!test(filter[key], obj[key])) {
+                pass = false;
+            }
+        });
+        return pass;
+    }
+
+    function test(example, value) {
+        if (typeof value === 'string' && example && example.constructor.name === 'RegExp') {
+            return value.match(example);
+        }
+        // not strict equality
+        return example == value;
+    }
+}
+
+Memory.prototype.destroyAll = function destroyAll(model, callback) {
+    Object.keys(this.cache[model]).forEach(function (id) {
+        delete this.cache[model][id];
+    }.bind(this));
+    this.cache[model] = {};
+    callback();
+};
+
+Memory.prototype.count = function count(model, callback) {
+    callback(null, Object.keys(this.cache[model]).length);
+};
+
+Memory.prototype.updateAttributes = function updateAttributes(model, id, data, cb) {
+    data.id = id;
+    var base = this.cache[model][id];
+    this.save(model, merge(base, data), cb);
+};
+
+function merge(base, update) {
+    Object.keys(update).forEach(function (key) {
+        base[key] = update[key];
+    });
+    return base;
+}
+