Add support for logical operator (AND/OR)

lib/connectors/memory.js

@@ -332,14 +332,31 @@ Memory.prototype.all = function all(model, filter, callback) {
 };
 
 function applyFilter(filter) {
-  if (typeof filter.where === 'function') {
-    return filter.where;
+  var where = filter.where;
+  if (typeof where === 'function') {
+    return where;
   }
-  var keys = Object.keys(filter.where);
+  var keys = Object.keys(where);
   return function (obj) {
     var pass = true;
     keys.forEach(function (key) {
-      if (!test(filter.where[key], obj && obj[key])) {
+      if(key === 'and' || key === 'or') {
+        if(Array.isArray(where[key])) {
+          if(key === 'and') {
+            pass = where[key].every(function(cond) {
+              return applyFilter({where: cond})(obj);
+            });
+            return pass;
+          }
+          if(key === 'or') {
+            pass = where[key].some(function(cond) {
+              return applyFilter({where: cond})(obj);
+            });
+            return pass;
+          }
+        }
+      }
+      if (!test(where[key], obj && obj[key])) {
         pass = false;
       }
     });
@@ -350,11 +367,14 @@ function applyFilter(filter) {
     if (typeof value === 'string' && example && example.constructor.name === 'RegExp') {
       return value.match(example);
     }
-    if (typeof example === 'undefined') return undefined;
-    if (typeof value === 'undefined') return undefined;
+    if (example === undefined || value === undefined) {
+      return undefined;
+    }
     if (typeof example === 'object') {
       // ignore geo near filter
-      if (example.near) return true;
+      if (example.near) {
+        return true;
+      }
 
       if (example.inq) {
         if (!value) return false;

test/basic-querying.test.js

@@ -131,6 +131,50 @@ describe('basic-querying', function () {
       });
     });
 
+    it('should support "and" operator that is satisfied', function (done) {
+      User.find({where: {and: [
+        {name: 'John Lennon'},
+        {role: 'lead'}
+      ]}}, function (err, users) {
+        should.not.exist(err);
+        users.should.have.property('length', 1);
+        done();
+      });
+    });
+
+    it('should support "and" operator that is not satisfied', function (done) {
+      User.find({where: {and: [
+        {name: 'John Lennon'},
+        {role: 'member'}
+      ]}}, function (err, users) {
+        should.not.exist(err);
+        users.should.have.property('length', 0);
+        done();
+      });
+    });
+
+    it('should support "or" that is satisfied', function (done) {
+      User.find({where: {or: [
+        {name: 'John Lennon'},
+        {role: 'lead'}
+      ]}}, function (err, users) {
+        should.not.exist(err);
+        users.should.have.property('length', 2);
+        done();
+      });
+    });
+
+    it('should support "or" operator that is not satisfied', function (done) {
+      User.find({where: {or: [
+        {name: 'XYZ'},
+        {role: 'Hello1'}
+      ]}}, function (err, users) {
+        should.not.exist(err);
+        users.should.have.property('length', 0);
+        done();
+      });
+    });
+
     it('should only include fields as specified', function (done) {
       var remaining = 0;