Add products module #46

app/Models/LineItem.php

@@ -15,8 +15,8 @@ class LineItem extends Model
         'is_section',
         'title',
         'description',
+        'unit_id',
         'quantity',
-        'unit',
         'price',
     ];
 
@@ -24,4 +24,9 @@ public function invoice()
     {
         return $this->belongsTo(Invoice::class);
     }
+
+    public function unit()
+    {
+        return $this->belongsTo(Unit::class);
+    }
 }