Unity SiblingComponent Attribute

SiblingComponentAttribute.cs

namespace Core.Attributes
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Reflection;
    using JetBrains.Annotations;
    using UnityEngine;

    [AttributeUsage(AttributeTargets.Field)]
    [MeansImplicitUse]
    public sealed class SiblingComponentAttribute : Attribute
    {
        public bool Optional = false;
    }

    public static void AssignSiblingComponents(this Component component)
    {
        IEnumerable<FieldInfo> fields = component.GetType()
                                                 .GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
                                                 .Where(prop => Attribute.IsDefined(prop, typeof(SiblingComponentAttribute)));

        foreach (FieldInfo field in fields)
        {
            Type fieldType = field.FieldType;
            Type componentType = fieldType.IsArray ? fieldType.GetElementType() : fieldType;

            Component[] siblingComponents = component.GetComponents(componentType);

            if (siblingComponents.Length > 0)
            {
                field.SetValue(component, siblingComponents[0]);
            }
            else if (!field.GetAttribute<SiblingComponentAttribute>().Optional)
            {
                Debug.LogError($"{component.gameObject} {component} - Unable to find sibling component of type {field.FieldType}");
            }
        }
    }
}