Merge Invoice and Bill into Document

app/Scopes/Document.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace App\Scopes;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Scope;
+use Illuminate\Support\Str;
+
+class Document implements Scope
+{
+    /**
+     * Apply the scope to a given Eloquent query builder.
+     *
+     * @param  \Illuminate\Database\Eloquent\Builder  $builder
+     * @param  \Illuminate\Database\Eloquent\Model  $model
+     * @return void
+     */
+    public function apply(Builder $builder, Model $model)
+    {
+        // Skip if already exists
+        if ($this->exists($builder, 'type')) {
+            return;
+        }
+
+        $type = request()->get('type') ?: Str::singular(request()->segment(2, ''));
+
+        // Apply document scope
+        $builder->where($model->getTable() . '.type', '=', $type);
+    }
+
+    /**
+     * Check if scope exists.
+     *
+     * @param  \Illuminate\Database\Eloquent\Builder  $builder
+     * @param  $column
+     * @return boolean
+     */
+    protected function exists($builder, $column)
+    {
+        $query = $builder->getQuery();
+
+        foreach ((array) $query->wheres as $key => $where) {
+            if (empty($where) || empty($where['column'])) {
+                continue;
+            }
+
+            if (strstr($where['column'], '.')) {
+                $whr = explode('.', $where['column']);
+
+                $where['column'] = $whr[1];
+            }
+
+            if ($where['column'] != $column) {
+                continue;
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+}