my changes

app/Http/Controllers/SitelinkController.php

@@ -0,0 +1,61 @@
+<?php
+namespace App\Http\Controllers;
+
+use Illuminate\Support\Facades\DB;
+use App\Dataset;
+use Illuminate\Http\Request;
+
+class SitelinkController extends Controller
+{
+
+    public function index()
+    {
+        //get server state published
+        $serverState = 'published';
+        $select = DB::table('documents')
+        ->where('server_state', 'LIKE', "%".$serverState."%");
+
+        $select
+        ->select(DB::raw('YEAR(published_date) as published_date'))
+        ->distinct(true);
+
+        $this->years = $select->pluck('published_date');
+        $this->ids = array();
+        return view('rdr.sitelink.index')->with(['years'=> $this->years,'documents'=> $this->ids]);
+    }
+
+    public function list($year)
+    {
+        $this->index();
+        if (preg_match('/^\d{4}$/', $year) > 0) {
+            $serverState = 'published';
+            //$select = DB::table('documents')
+            //->where('server_state','LIKE', "%".$serverState."%");
+            $select = Dataset::with('titles', 'authors')
+                ->where('server_state', 'LIKE', "%".$serverState."%");
+
+            $from = (int)$year;
+            $until =  $year + 1;
+            $select
+            ->whereYear('server_date_published', '>=', $from)
+            ->whereYear('server_date_published', '<', $until);
+
+
+            $documents = $select
+                ->get();
+
+            //$this->years = Dataset::select(DB::raw('YEAR(server_date_modified) as server_date_modified'))
+            //->distinct(true)
+            //->pluck('server_date_modified');
+            //->filter(function ($item) use ($year){
+            //    return $item->year !== $year;
+            //});
+
+
+            //$select->select('id');
+            //$this->ids = $select->pluck('id');
+            //return view('rdr.sitelink.index')->with(['years'=> $this->years,'ids'=> $this->ids]);
+            return view('rdr.sitelink.index')->with(['years'=> $this->years,'documents'=> $documents]);
+        }
+    }
+}