Add basic pagination

src/server/router/plural.js

@@ -47,6 +47,7 @@ module.exports = function (db, name) {
     var q = req.query.q
     var _start = req.query._start
     var _end = req.query._end
+    var _page = req.query._page
     var _sort = req.query._sort
     var _order = req.query._order
     var _limit = req.query._limit
@@ -146,17 +147,23 @@ module.exports = function (db, name) {
     }
 
     // Slice result
-    if (_end || _limit) {
+    if (_end || _limit || _page) {
       res.setHeader('X-Total-Count', chain.size())
       res.setHeader('Access-Control-Expose-Headers', 'X-Total-Count')
     }
 
+    if (_page) {
+      _page = parseInt(_page, 10)
+      _page = _page >= 1 ? _page : 1
+      _limit = parseInt(_limit, 10) || 10
+      _start = (_page - 1) * _limit
+      chain = chain.slice(_start, _start + _limit)
+    } else if (_end) {
       _start = parseInt(_start, 10) || 0
-
-    if (_end) {
       _end = parseInt(_end, 10)
       chain = chain.slice(_start, _end)
     } else if (_limit) {
+      _start = parseInt(_start, 10) || 0
       _limit = parseInt(_limit, 10)
       chain = chain.slice(_start, _start + _limit)
     }

test/server/plural.js

@@ -51,6 +51,24 @@ describe('Server', function () {
       {resource: {name: 'howe'}}
     ]
 
+    db.list = [
+      {id: 1},
+      {id: 2},
+      {id: 3},
+      {id: 4},
+      {id: 5},
+      {id: 6},
+      {id: 7},
+      {id: 8},
+      {id: 9},
+      {id: 10},
+      {id: 11},
+      {id: 12},
+      {id: 13},
+      {id: 14},
+      {id: 15}
+    ]
+
     server = jsonServer.create()
     router = jsonServer.router(db)
     server.use(jsonServer.defaults())
@@ -236,6 +254,30 @@ describe('Server', function () {
     })
   })
 
+  describe('GET /:resource?_page=', function () {
+    it('should paginate', function (done) {
+      request(server)
+        .get('/list?_page=2')
+        .expect('Content-Type', /json/)
+        .expect('x-total-count', db.list.length.toString())
+        .expect('Access-Control-Expose-Headers', 'X-Total-Count')
+        .expect(db.list.slice(10, 20))
+        .expect(200, done)
+    })
+  })
+
+  describe('GET /:resource?_page=&_limit=', function () {
+    it('should paginate with a custom limit', function (done) {
+      request(server)
+        .get('/list?_page=2&_limit=1')
+        .expect('Content-Type', /json/)
+        .expect('x-total-count', db.list.length.toString())
+        .expect('Access-Control-Expose-Headers', 'X-Total-Count')
+        .expect(db.list.slice(1, 2))
+        .expect(200, done)
+    })
+  })
+
   describe('GET /:resource?attr_gte=&attr_lte=', function () {
     it('should respond with a limited array', function (done) {
       request(server)