Fix a regression in mongodb connector

lib/dao.js

@@ -392,7 +392,18 @@ DataAccessObject._coerce = function (where) {
               return Boolean(val);
             }
           };
+        } else if(DataType === Number) {
+          // This fixes a regression in mongodb connector
+          // For numbers, only convert it produces a valid number
+          // LoopBack by default injects a number id. We should fix it based
+          // on the connector's input, for example, mongoddb should use string
+          // while RDBs typically use number
+          DataType = function(val) {
+            var num = Number(val);
+            return !isNaN(num) ? num : val;
+          };
         }
+
       if (!DataType) {
           continue;
         }

test/loopback-dl.test.js

@@ -662,6 +662,14 @@ describe('DataAccessObject', function () {
     assert.deepEqual(where, {date: undefined});
   });
 
+  it('should skip conversion if it produces NaN for numbers', function () {
+    where = model._coerce({age: 'xyz'});
+    assert.deepEqual(where, {age: 'xyz'});
+
+    where = model._coerce({age: {inq: ['xyz', '12']}});
+    assert.deepEqual(where, {age: {inq: ['xyz', 12]}});
+  });
+
 });
 
 describe('Load models from json', function () {