Merge pull request #27 from manuquentin/add_field_sorting

[RFR] Allows to sort on a field

src/routes.js

@@ -27,9 +27,13 @@ routes.list = function(req, res, next) {
   // parameters
   var _start = req.query._start
   var _end = req.query._end
+  var _sort = req.query._sort
+  var _sortDir = req.query._sortDir
 
   delete req.query._start
   delete req.query._end
+  delete req.query._sort
+  delete req.query._sortDir
 
   if (req.query.q) {
 
@@ -68,6 +72,18 @@ routes.list = function(req, res, next) {
     }
   }
 
+  if(_sort) {
+      _sortDir = _sortDir || 'ASC'
+
+      array = _.sortBy(array, function(element) {
+          return element[_sort];
+      })
+
+      if (_sortDir === 'DESC') {
+          array.reverse();
+      }
+  }
+
   // Slice result
   if (_end) {
   	res.setHeader('X-Total-Count', array.length)

test/server.js

@@ -91,6 +91,32 @@ describe('Server', function() {
     })
   })
 
+  describe('GET /:resource?sort=', function() {
+      it('should respond with json and sort on a field', function(done) {
+          request(server)
+              .get('/tags?_sort=body')
+              .expect('Content-Type', /json/)
+              .expect([low.db.tags[1], low.db.tags[0], low.db.tags[2]])
+              .expect(200, done)
+      })
+
+      it('should reverse sorting with sortDir=DESC', function(done) {
+          request(server)
+              .get('/tags?_sort=body&_sortDir=DESC')
+              .expect('Content-Type', /json/)
+              .expect([low.db.tags[2], low.db.tags[0], low.db.tags[1]])
+              .expect(200, done)
+      })
+
+      it('should sort on numerical field', function(done) {
+          request(server)
+              .get('/posts?_sort=id&_sortDir=DESC')
+              .expect('Content-Type', /json/)
+              .expect(low.db.posts.reverse())
+              .expect(200, done)
+      })
+  })
+
   describe('GET /:resource?_start=&_end=', function() {
     it('should respond with a sliced array', function(done) {
       request(server)