Fixed getting "custom attribute panicked" message when using `[#Object]` helper. #409

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.5.3] - 2021-02-13
+
+### Fixed
+
+- Fixed [#409](https://github.com/async-graphql/async-graphql/issues/409)
+
 ## [2.5.2] - 2021-02-06
 
 ### Added

derive/src/object.rs

@@ -63,6 +63,14 @@ pub fn generate(
                 let mut create_ctx = true;
                 let mut args = Vec::new();
 
+                if method.sig.inputs.is_empty() {
+                    return Err(Error::new_spanned(
+                        &method.sig,
+                        "The self receiver must be the first parameter.",
+                    )
+                    .into());
+                }
+
                 for (idx, arg) in method.sig.inputs.iter_mut().enumerate() {
                     if let FnArg::Receiver(receiver) = arg {
                         if idx != 0 {
@@ -253,6 +261,14 @@ pub fn generate(
                 let mut create_ctx = true;
                 let mut args = Vec::new();
 
+                if method.sig.inputs.is_empty() {
+                    return Err(Error::new_spanned(
+                        &method.sig,
+                        "The self receiver must be the first parameter.",
+                    )
+                    .into());
+                }
+
                 for (idx, arg) in method.sig.inputs.iter_mut().enumerate() {
                     if let FnArg::Receiver(receiver) = arg {
                         if idx != 0 {