exwar · August 29, 2015 14:24 · Jul 12, 2015
diff --git a/api.js b/api.js
@@ -0,0 +1,7 @@
+var express = require('express');
+var router = express.Router();
+
+router.use('/playlists', require('./playlists'));
+router.use('/songs', require('./songs'));
+
+module.exports = router;
diff --git a/index.js b/index.js
@@ -0,0 +1,8 @@
+var express = require('express');
+var app = express();
+
+app.set('json spaces', 2);
+
+app.use('/api', require('./api'));
+
+app.listen(3000);
diff --git a/playlists.js b/playlists.js
@@ -0,0 +1,41 @@
+var express = require('express');
+var router = express.Router();
+
+var playlists = [
+  { id: 1, title: 'Rock', songs: [4,5,6,7] },
+  { id: 2, title: 'Pop', songs: [1,2,3] },
+  { id: 3, title: 'Jazz', songs: [8,9,10,11,12] }
+];
+
+router.get('/', function (req, res) {
+  res.json(playlists);
+});
+
+router.param('id', function (req, res, next, id) {
+  var item = playlists.filter(function (item) {
+    return item.id == id;
+  });
+  req.playlistItem = item.length ? item[0] : null;
+  next();
+});
+
+router.route('/:id')
+  .get(function (req, res, next) {
+    return req.playlistItem ? res.json(req.playlistItem) : next();
+  })
+  .post(function (req, res) {
+    // create item
+  })
+  .put(function (req, res) {
+    // update item
+  })
+  .delete(function (req, res) {
+    // delete item
+  });
+
+
+// handle "/api/playlists/1/songs/" as well
+router.use('/:id/songs', require('./songs'));
+
+
+module.exports = router;
diff --git a/songs.js b/songs.js
@@ -0,0 +1,58 @@
+var express = require('express');
+var router = express.Router();
+
+var songs = [
+  { id: 1, artist: 'Madonna', title: 'Living for Love' },
+  { id: 2, artist: 'Madonna', title: 'Ghosttown' },
+  { id: 3, artist: 'Madonna', title: 'Like a Prayer' },
+  { id: 4, artist: 'Red Hot Chili Peppers', title: 'Californication' },
+  { id: 5, artist: 'Red Hot Chili Peppers', title: 'Under the Bridge' },
+  { id: 6, artist: 'Bruce Springsteen', title: 'Born in the U.S.A.' },
+  { id: 7, artist: 'Bruce Springsteen', title: 'Dancing in the Dark' },
+  { id: 8, artist: 'Miles Davis', title: 'Blue in Green' },
+  { id: 9, artist: 'Miles Davis', title: 'So What' },
+  { id: 10, artist: 'Nina Simone', title: 'Feeling Good' },
+  { id: 11, artist: 'Nina Simone', title: 'My Baby Just Cares for Me' },
+  { id: 12, artist: 'Nina Simone', title: 'I Put a Spell on You' }
+];
+
+function filterByPlaylist(playlist, songs) {
+  if (playlist) {
+    songs = songs.filter(function (song) {
+      return playlist.songs.some(function (songId) {
+        return songId == song.id;
+      });
+    });
+  }
+  return songs;
+}
+
+router.get('/', function (req, res) {
+  res.json(filterByPlaylist(req.playlistItem, songs));
+});
+
+router.param('id', function (req, res, next, id) {
+  var item = filterByPlaylist(req.playlistItem, songs)
+    .filter(function (item) {
+      return item.id == id;
+    });
+  req.songItem = item.length ? item[0] : null;
+  next();
+});
+
+router.route('/:id')
+  .get(function (req, res, next) {
+    return req.songItem ? res.json(req.songItem) : next();
+  })
+  .post(function (req, res) {
+    // create item
+  })
+  .put(function (req, res) {
+    // update item
+  })
+  .delete(function (req, res) {
+    // delete item
+  });
+
+
+module.exports = router;
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