Added columns in model files of Item and line and production plan and production quantity

app/Models/ProductionPlan.php

@@ -16,9 +16,12 @@ class ProductionPlan extends Model
     protected $fillable = [
         'plant_id',
         'shift_id',
+        'item_id',
         'line_id',
         'plan_quantity',
         'production_quantity',
+        'working_days',
+        'leave_dates',
         'operator_id',
         'created_at',
         'updated_at',
@@ -39,6 +42,11 @@ class ProductionPlan extends Model
         return $this->belongsTo(Line::class);
     }
 
+    public function item(): BelongsTo
+    {
+        return $this->belongsTo(Item::class);
+    }
+
     public function prunable(): Builder
     {
         return static::where('created_at', '<=', now()->subMonthsNoOverflow(6));