Loot objects without being blocked

Hello, I'm having trouble making a right system to loot items on the ground. I've currently made a bow that can throw arrows and I would like to loot the arrows which are stuck in the walls by walking on it.
To avoid the other objects to collide the "stuck arrows" I've set the layer to a custom one that will not collide with other objects except the player (using the layer matrix). When the player collides with a loot tagged object it will destroy it (and will truly loot it in the future).

The problem I face is that when the player collides that item, it stops the player, which is really annoying when looting a lot of stuff.. I've searched some solutions about layers but the thing I'm looking for is a way to make an object colliding with others but not affecting their movement.

Sorry if the answer looks obvious to you I'm still discovering the features and mechanics of unity and I would be very thankful if you could give me a clue on that. Thanks in advance

Here is the part of my arrow script :

Code (CSharp):

1. private void OnCollisionEnter2D(Collision2D collision)
2.     {
3.         if (collision.collider.CompareTag("Walls"))
4.         {
5.             rb.isKinematic = true; // Stops the arrow from its movement and freeze it until it's looted or destroyed
6.             rb.velocity = Vector2.zero;
7.             rb.freezeRotation = true;
8.             gameObject.layer = 8; // Loot layer -> will only collide with the player
9.             gameObject.tag = "Loot";
10.             Destroy(gameObject, 20f); // Destroy it if the player does not loot it in 20s
11.         }
12.     }

And the part of my player script (which is very simple):

Code (CSharp):

1.     private void OnCollisionEnter2D(Collision2D collision)
2.     {
3.         if (collision.collider.CompareTag("Loot"))
4.         {
5.             Destroy(collision.gameObject);
6.             // + add to inventory
7.         }
8.     }

 

@Morgomir

Instead of setting your arrows and other pickups as collision objects, make them triggers, this way you can "walk through" them, but still get the collision message:

https://docs.unity3d.com/ScriptReference/MonoBehaviour.OnTriggerEnter2D.html

 

Works perfectly, thanks !
I thought trigger was used for things that needs to be activated only once. As I expected the answer was pretty obvious x)