From cd739492d3c5371743a09dba3c1ff6b96b08277d Mon Sep 17 00:00:00 2001
From: Louis Chatriot <louis.chatriot@gmail.com>
Date: Thu, 23 May 2013 12:33:07 +0200
Subject: [PATCH] Created  operator

---
 lib/model.js       | 18 +++++++++++++++++-
 test/model.test.js | 16 ++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/lib/model.js b/lib/model.js
index a8427ae..9f561c2 100644
--- a/lib/model.js
+++ b/lib/model.js
@@ -287,7 +287,7 @@ function getDotValue (obj, field) {
 
 
 /**
- * Match any of the subconditions
+ * Match any of the subqueries
  */
 matcherFunctions.$or = function (obj, query) {
   var i;
@@ -302,6 +302,22 @@ matcherFunctions.$or = function (obj, query) {
 };
 
 
+/**
+ * Match all of the subqueries
+ */
+matcherFunctions.$and = function (obj, query) {
+  var i;
+
+  if (!util.isArray(query)) { throw "$and operator used without an array"; }
+
+  for (i = 0; i < query.length; i += 1) {
+    if (!match(obj, query[i])) { return false; }
+  }
+
+  return true;
+};
+
+
 /**
  * Tell if a given document matches a query
  * @param {Object} obj Document to check
diff --git a/test/model.test.js b/test/model.test.js
index 3624395..55b427b 100644
--- a/test/model.test.js
+++ b/test/model.test.js
@@ -488,6 +488,22 @@ describe('Model', function () {
         model.match({ hello: 'world', age: 15 }, { $and: [ { hello: 'pluton' }, { age: { $lt: 20 } } ] }).should.equal(false);
       });
 
+      it('Logical operators are all top-level, only other logical operators can be above', function () {
+        model.match({ a: { b: 7 } }, { a: { $or: [ { b: 5 }, { b: 7 } ] } }).should.equal(false);
+        model.match({ a: { b: 7 } }, { $or: [ { "a.b": 5 }, { "a.b": 7 } ] }).should.equal(true);
+      });
+
+      it('Logical operators can be combined as long as they are on top of the decision tree', function () {
+        model.match({ a: 5, b: 7, c: 12 }, { $or: [ { $and: [ { a: 5 }, { b: 8 } ] }, { $and: [{ a: 5 }, { c : { $lt: 40 } }] } ] }).should.equal(true);
+        model.match({ a: 5, b: 7, c: 12 }, { $or: [ { $and: [ { a: 5 }, { b: 8 } ] }, { $and: [{ a: 5 }, { c : { $lt: 10 } }] } ] }).should.equal(false);
+      });
+
+      it('Should throw an error if a logical operator is used without an array or if an unknown logical operator is used', function () {
+        (function () { model.match({ a: 5 }, { $or: { a: 5, a: 6 } }); }).should.throw();
+        (function () { model.match({ a: 5 }, { $and: { a: 5, a: 6 } }); }).should.throw();
+        (function () { model.match({ a: 5 }, { $unknown: [ { a: 5 } ] }); }).should.throw();
+      });
+
     });
 
   });   // ==== End of 'Finding documents' ==== //