You cannot create a second #[godot_api] for an impl

[miruji]

As far as I can see right now, you cannot create a second #[godot_api] for the same structure twice.

I’m not sure if this is a well-known behavior, but I ran into it when I was moving some methods out of a large file to split the logic (over 2,000 lines). Essentially, you cannot move #[func] methods anywhere except a single file this way — and that’s quite unfortunate for large files.

The compiler itself points out that #[godot_api] can only appear once per struct impl.

My version is 0.4.4.

[bakana808]

You can have multiple #[godot_api]s, but the additional ones need to be marked as secondary (#[godot_api(secondary)]), and you can only have one "primary" one. The documentation for this is found in https://godot-rust.github.io/docs/gdext/master/godot/register/attr.godot_api.html#multiple-inherent-impl-blocks.

[Bromeon]

Yes, this is already possible, albeit with some limitations (e.g. no signals). Lifting those limitations would need significant efforts in the proc-macro machinery, if possible at all... And this may be better achievable with the builder API (#4).

[miruji]

You can have multiple #[godot_api]s, but the additional ones need to be marked as secondary (#[godot_api(secondary)]), and you can only have one "primary" one. The documentation for this is found in https://godot-rust.github.io/docs/gdext/master/godot/register/attr.godot_api.html#multiple-inherent-impl-blocks.

Yes, this is already possible, albeit with some limitations (e.g. no signals). Lifting those limitations would need significant efforts in the proc-macro machinery, if possible at all... And this may be better achievable with the builder API (#4).

On master, I see the same thing as on 0.4.4, even though I can clearly tell that this is master:

godot = {git = "https://github.com/godot-rust/gdext", branch = "master", features = ["experimental-threads"]}

error[E0425]: cannot find value `__registration_methods_GdNetworkManager` in this scope
   --> src/network/gdNetworkClient.rs:6:6
    |
6   | impl GdNetworkManager
    |      ^^^^^^^^^^^^^^^^ not found in this scope
    |
note: static `crate::network::gdNetworkManager::__registration_methods_GdNetworkManager` exists but is inaccessible
   --> src/network/gdNetworkManager.rs:280:1
    |
280 | #[godot_api]
    | ^^^^^^^^^^^^ not accessible
    = note: this error originates in the attribute macro `godot_api` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0425]: cannot find value `__registration_constants_GdNetworkManager` in this scope
   --> src/network/gdNetworkClient.rs:6:6
    |
6   | impl GdNetworkManager
    |      ^^^^^^^^^^^^^^^^ not found in this scope
    |
note: static `crate::network::gdNetworkManager::__registration_constants_GdNetworkManager` exists but is inaccessible
   --> src/network/gdNetworkManager.rs:280:1
    |
280 | #[godot_api]
    | ^^^^^^^^^^^^ not accessible
    = note: this error originates in the attribute macro `godot_api` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0412]: cannot find type `__godot_GdNetworkManager_Funcs` in this scope
 --> src/network/gdNetworkClient.rs:5:1
  |
5 | #[godot_api(secondary)]
  | ^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
  |
  = note: this error originates in the attribute macro `godot_api` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this struct
  |
1 + use crate::network::gdNetworkManager::__godot_GdNetworkManager_Funcs;
  |

This is on:

use godot::prelude::godot_api;
use crate::network::gdNetworkManager::GdNetworkManager;
// =================================================================================================

#[godot_api(secondary)]
impl GdNetworkManager
{
  
}

#[derive(GodotClass)]
#[class(init, base = Node)]
pub struct GdNetworkManager
{
  base: Base<Node>,
  // ... params
}
#[godot_api]
impl INode for GdNetworkManager
{
 // ... funcs
}
#[godot_api]
impl GdNetworkManager
{
  // .. funcs
}

Well, I read that there shouldn’t be RPC and signal, but I only have Rust and Godot methods and nothing else. Moreover, I haven’t even started moving anything to another file yet.