Merge pull request typicode#276 from tony-kerz/tk/nested-sort

support sort by nested field (e.g. _sort=author.name)

Author: typicode

src/server/router/plural.js

@@ -141,7 +141,7 @@ module.exports = function (db, name) {
       _order = _order || 'ASC'
 
       chain = chain.sortBy(function (element) {
-        return element[_sort]
+        return _.get(element, _sort)
       })
 
       if (_order === 'DESC') {

test/server/plural.js

@@ -47,6 +47,12 @@ describe('Server', function () {
       { a: 1 }
     ]
 
+    db.nested = [
+      {resource: {name: 'dewey'}},
+      {resource: {name: 'cheatem'}},
+      {resource: {name: 'howe'}}
+    ]
+
     server = jsonServer.create()
     router = jsonServer.router(db)
     server.use(jsonServer.defaults())
@@ -198,6 +204,14 @@ describe('Server', function () {
         .expect(db.posts.reverse())
         .expect(200, done)
     })
+
+    it('should sort on nested field', function (done) {
+      request(server)
+        .get('/nested?_sort=resource.name')
+        .expect('Content-Type', /json/)
+        .expect([db.nested[1], db.nested[0], db.nested[2]])
+        .expect(200, done)
+    })
   })
 
   describe('GET /:resource?_start=&_end=', function () {