INVENTORY & ITEM SYSTEM in Godot 

It is to be noted that the syntax to export variables is now '@export var'. I've found this while using version 4.0.2 and I'm unsure when this started but hopefully this helps others.

deletes func _ready(): *procedes to write func _ready(): Is this the equivalent of opening up blender, deleting the default cube and instantly doing shift + a add cube?

Absolutely great tutorial! Prolly the best I have ever watched. Super informative and detailed and still not too long. Thanks a lot dude, 5/5!

I wish this video had more views because your way of handling an inventory system using resources is absolutely top notch :) SUBSCRIBED :D

Scare Daddy. We miss you, glad to see you're still uploading!

Your videos are inspiring. I followed the "Make an FPS" parts and it really helped me to further understand how Godot works. keep it up

this is a concept that has always intimidated me in gamedev, which has basically stopped me from making uh... any kind of complex game whatsoever lul. but you explained this very well, even for my tiny brain! it'll take more studying but i think i have a light grasp on it now. so thank you!

WOW! Such a nicely designed tutorial. This really helped me out. Thank youI

By the way, your video is amazing! I would love to see a second part, in which you approach some untouched aspects, like using the UI to "spawn" the items.

Great tutorial! Please more like this! Good programming practices

Can you make a video on how to save and load items using this inventory system of yours

I would love to see a tutorial on how to make an actual useable item with effects!

great video. easy to follow and very complete! I hope I'll be able to use this in a game soon.

finally, a proper inventory implementation guide, unlike what other youtubers propose

Amazing the resource trick was very good. I am going to take this idea and going to expand onto it :D

awesome vid Mr Tom, great!!

Excellent Tutorial!

Awesome video Tom. Just curious. How do you set the texture inside the InventoryGrid? Perhaps it will be explained in the next tutorial video =)

Hey thanks for this amazing tutorial , beginners like me get to learn a lot about the game engine this way. Although I was wondering : *How do you reset the items in the inventory to a constant value when you load the game?*. :)

this might just be the best inventory tutorial i've seen so far. i love how clean your code is and on top of that you explain complex systems in a way that makes it easy to follow. do you consider making more videos about this topic? there are so many things still left untouched that i would love to see your approach on. for example making the inventory visuals, drag and drop (by clicking, not just dragging), splitting stacks, dropping items, equipping or consuming items and so on in any case that's an easy sub for me and i hope to see more of you in the future!

Keep making these videos Tom they are Oh so good

Holy sheet this is a great tutorial. It really is great for teaching you the gd script API and how it works.

Thx big for your work!!!

really good video bro

🤘 love you videos xx

Awesome! Thanks

I did not understand a f*cking thing in this video but my inventory system works so thanks :)

Solid tut

I don't think the database approach would scale performance wise if you have more than a thousand items. Loading upfront all the items resource would require a lot of memory ( if you account the mesh and the textures). Same thing applied for the get item function, worstt case scenario would check the whole database to return an item. If you're going to manage a lot of items you don't really need to load the whole db upfront. I managed to make it fast by searching the item by it's resource name, and by checking if the resource exists

cool work

This works great! But where would i add custom code? Like what effect the Item would have if you right click with it or so.

I want to thank you for all your awesome tuts. I follow the top-down tut and I create a fun Combat-like tank game but I want to ask you if I can open source the game because I'm base the game in your code. Thank you. PS: sorry for my english

well thanks for the video. now i have to figure out how to remove items xD this will be a hassle

Hi. Great video. How can i equip or use items that i collect?

SOLVED BEFORE I POSTED, SOLUTION AT END let's say i didn't want to save the inventory data in a separate file when it is changed (i'll save it elsewhere). how would you get the UI to update after changing scenes? the GameManager initializes the player once. i have the player.inventory reference passed through via a singleton script. i then reinitialize the player (via its own function) for the GameManager, except instead of loading the inventory from the file, i load it from my previous reference. all this works fine. in your initialise_player function in the GameManager, you emit a signal that is listened to by the UI, which connects player.inventory to the UI's _on_player_inventory_changed function to update the display. my problem is that this signal does not appear to be re-emitted when i re-initialize the player, therefore, when i change scenes and reinstantiate the player, nothing i do will make the label in the UI show up. nothing except for manually calling the GameManager's reinitialize function with a hard-coded keystroke - which, again, connects the player.inventory's "inventory_changed" signal to the UI's "_on_player_inventory_changed" function. is it "connecting" late? SOLUTION: fixed the issue by moving the UI's player_initialization connection from _ready() to _init().

Another doubt just appeared as I was near the end of the video. At 47:43, you create the Magic Orbs, what would be the best way to make it so as each Magic Orb has some unique stats? For example if I have a sword (non stackable), and it has a durability counter, what's the best way to store that between dropped/equipped/saved states?

Thank you tom

I have a question. At around 28:01, you create new_item as a dictionary. Is there a reason to not create a InventoryItem class (from Resrouce) to keep this data instead of a Dict? This way we would be able to have the static typing advantage. Is there a reason to not create it as a class?

Great tutorial, but how can we access item values and functions, to use a health potion, for example? ^^

just finished the last one ........i was wondering if you can tackle a leveling up and power up system every game has those also

Hi! This tutorial was super helpful and I learned a lot. I was curious how I would go about using textures rather than text so that I can have a visual inventory. I think I just need to reference the texture rather than have a string for the item name but I'm not entirely sure how to do that since each item has a different texture. Would I use the resource so it loads a general texture?

A very nice tutorial! Only thing i dont understand is why the _items in the Inventory Resource is an export variable. Because when you make the MagickOrb you use the exported vars to configure the MagickOrb, but with the Inventory you dont use the _items to configure anything. And you use the functions to manipulate the _items internally. Am I mising something here? Or is it an Export because it otherwise dont get saved on the disk?

Amazing tutorials. Works splendidly. But i want to expand it a little and use other variables / sprites / meshes :D. Any pointers where i should start? My guess is change somehow get item in item_database script and then add item function in invventory script. I don't want exact solution or tutorial, but just tell me if i am thinking right :D

How could we implement this code to have enemies drop gear when killed? I love the video man, best item system video tutorial for godot engine.

I have a question. How do you subtract a quantity or an item from the inventory when you are done (let's say) using the item or removing it in-game?

Thx

I enjoyed it. I don't think a persistent inventory is a good idea, but I understand you were just showing people some methods to do something like this.

Hey Tom, I am having an issue with the items displaying in the inventory. I have it set to add 3 Oak Logs, and instead of adding a stack of 3 Oak Logs, it adds 3 stacks of x1 Oak Logs. I tried messing with the export var and even the max_stack_size check in the Inventory script but nothing seems to fix it?

How would this work if you have weapon items in your game? Like a sword that is an area2d and swings around?

Hello. How can you implement a method to remove an item from inventory?

how can i remove items from the inventory?

For those using Godot 4.1 or later, there are a lot of issues you'll run into with the code in this video.

hi, since the folder structure doesnt exist after export do we know how to create a system like this which respects the conversion of the gamefiles?

Would this way of using resources as items be expandable upto 100’s of items in a game?? (Performance wise and in general)

Pls can u explain this part of the code " inventory_item.item_reference.name " in the player inventory Resource script , cause I have gone through godot doc to find such functions or methods so to understand what it does , the return value , and the type it extends

how to work in an incremental item_id when creating new item sending int over network is more desireable

Edit: Solved it, see edit below. Thanks! Mine was saying it couldn't find the inventory.tres file. I created a new resource named that and copied it into my user data, but it's still saying "Invalid Call. nonexistent function 'get_items' in base 'Resource' ". It's highlighting line 23 in the GameManager, the line that says "player.inventory.set_items(existing_inventory.get_items())", so I don't think I created the inventory.tres file correctly, or something. Do you have a solution? Edit: Ok, so I copied the ResourceSaver.save(user://inventory.tres") part just above the If statement so it would create a correctly parsed file. It was still giving me the get_items error. I just copied the "get_items" text from the func and pasted it over it and then it suddenly worked. It's like there was a hidden character or something goofy going on there. I'll leave this comment here in case anyone else has this issue. Thanks for the tutorial!

I don't know why the line of code at 15:22 gives me a "The getter function isn't defined." Where did I go wrong?

i get the error message "Directory" not declared in the current scope? Any sugestions?

hi , thanks for this , now how to have slots and have one item per slot

I've been building my own inventory/ interactabale object system and it functions using a basic node structure (sprite, area2D, etc), and built-in scripts which I'm planning on extending for each unique item. Can anyone help me extrapolate whether I'll run into any limitations with that system as opposed to this one which is based around resources? Saving is something I need to consider, I haven't gotten around to learning that part, or resources in general. But from this tutorial I changed my Inventory (which is an autoload) to extend the Resource type, so I should be able to save that with a bit of added functionality? One of the only other "advantages" I can see to the resource method, is that you have less in your scene tree, and store objects in the file system, which might be preferable subjectively? would appreciate any thoughts

Hey, I have a problem with the get_item(item_name) function in the ItemDatabase. It gives me an error at the if i.name == item_name "Invalid get index 'name' (on base: 'null instance')". I don't really understand the error (since I'm pretty new to Godot), can somebody help me? UPDATE: Problem solved. It apparently appended the items from a wrong folder or smth. I just reassigned the folder and it worked. I don't know what the problem actually was.

Thanks for the tutorial, but I'm getting this error when I try to play my project: E 0:00:01.159 emit_signal: Error calling method from signal 'player_initialised': 'GridContainer(InventoryGrid.gd)::on_player_initialised': Method not found.. core/object.cpp:1228 @ emit_signal() GameManager.gd:17 @ initialise_player() GameManager.gd:9 @ _process() Not sure what the problem is, any ideas? Code at the noted lines seems correct.

How would i access the item type in the script?

FYI, "if it's not a directory, it's definitely a file" is not true on anything other than windows (or even WSL).

Following this tutorial, followed everything to a tee and yet when I run it says "Invalid get index 'inventory' (on base: Spatial) Version 3.5.1

Broh this is a great video in general but you should use a dictionary instead of an array for constant time access to those inventory items instead of having to search that array.

Finally did it, WITH NO WARNINGS😩

Hey @Code with Tom I'm not seeing the name of the items im picking up on the panel, not sure why

Hi, this probably won't be seen, but I have an issue. I've followed the tutorial up to 43:00, but when I play the scene, none the label simply does not come up. I have a different name for both the player and the item. Idk what's gone wrong.

hey I really like your inventory system, I was so free to add it to my project but I have one issue and I don't know how to fix it. Can you make that the text won't delete every node in the grid? Maybe I'm just stupid but I don't want to have Potion x2 but a texture of the potion in a texture rect inside the grid container.

Is there any plans to make a Godot 4 version of this tutorial? I am stuck with converting this line into the new format: export var _items = Array() setget set_items, get_items. So far I have this: @export var _items: Array but don't know how to get the setget part working.

Can you fix sliding from slopes?

Amazing work! However, I've follow all your tutorial but when I'm launching my UI scene, nothing appear on the screen (no error in the code, just no visual result). Do you know how to resolve this issue ? Sorry for the question as you are already giving us a great inventory system, but I don't find where is the issue. thanks a lot!

why is it when i make a new array in the inventory, it copies all the items in the _items array?

Question, wouldnt Dictionary be better for item database instead of array? Array works well when you dont have lot of items, but i belive Dictionary is quicker with lots of them, or im wrong?

At the end,when you pick up the orb the First stack goes 1,2,3 and the second one goes from 1 to 3 whitout taking the ladt orb (i didn't see all the video lol)

Any reason why you would prefer this over just creating a dictionary for all items in a standard autoload alongside an inventory array?

My inventory is now many stacked and unstacked items which don't go away even after I close the game then run it again. Maybe I missed something.

Can anyone help me to make a remove_item function for the inventory? I want to make a shop, so I need to remove items when the player sells them. I'm having trouble reverse engineering the add_item function.

Hello, thanks for tutorial but I have error that saying that it can't find player node 32:35

I have a few errors, and i dont know how to fix them, here they are: E 0:00:03.072 load_interactive: Cannot open file 'user://inventory.tres'. Condition "err != OK" is true. Returned: Ref() scene/resources/resource_format_text.cpp:1228 @ load_interactive() GameManager.gd:20 @ initialize_player() GameManager.gd:9 @ _process() E 0:00:03.171 _load: Failed loading resource: user://inventory.tres. Condition "found" is true. Returned: RES() core/io/resource_loader.cpp:278 @ _load() GameManager.gd:20 @ initialize_player() GameManager.gd:9 @ _process() it is also saying that Invalid get index 'name' (on base: 'String')

First

Okay, so I went by your video, but for some reason in the "Player.gd" script it throws out an error " Attempt to call function 'new' in base 'null instance' on a null instance." (video time 30:21)

Is this tutorial on github?

my label is empty and I don't know what I have done wrong. Where are the "typical beginner mistakes"? Ps: I added the control nodes to the player because I wanted the inventory to move with the player

29:08 time in vid :P

Is the code on your github tom?

initialise_player() i have wrote Var Player and Var player_initialised() Yet it says I have not declared initialise_player() in the current class even though I have, I am comparing my script and I see no difference, you also should explain a bit more instead of just typing, help

For some reason when i click play, now it dosnt even load up the game or screen

PLease help me!

I don't have a user://inventory.tres file. How do i create one? Please excuse me if my question is silly, I'm new to game development.

Please, before starting a 50 min tutorial dont just straight up jump into the code. An explanation of what the system is going to be able to do and what is going to be needed for that would be much appreciated. (To be a bit more blunt: Im not going to watch this video because what I explained above is missing in the first few minutes of the video.)

when you realize you shouldnt have deleted make human why did i delete it

var item var items fkng hell...

I hard to work through some random bugs for hours that eventually seemed to resolve themselves rip

violets are red roses are blue ctrl: C i stole your code too

Why do you create resource? Why not just script with a class_name? Why not new scene?

[05:01] I can not find ItemResource (Item.gd).

If someone can put all the code here so i can post it itl be great lol