Draft: Unable to read configuration from yaml file

[sxwebdev]

Unable to read configuration from yaml file:

main.go

package main

import (
	"log"

	"github.com/cristalhq/aconfig"
	"github.com/cristalhq/aconfig/aconfigdotenv"
	"github.com/cristalhq/aconfig/aconfigyaml"
)

type StringType string

type NestedStruct struct {
	Key string
}

type NestedArr struct {
	Enabled      bool
	Str          StringType
	NestedStruct NestedStruct `yaml:"nested_struct"`
	Data         map[string]any
}

type Items struct {
	Arrs []NestedArr
}

type MyConfig struct {
	Items Items `yaml:"items"`
}

func main() {
	var cfg MyConfig
	loader := aconfig.LoaderFor(&cfg, aconfig.Config{
		Files: []string{"config.yaml"},
		FileDecoders: map[string]aconfig.FileDecoder{
			".yaml": aconfigyaml.New(),
			".yml":  aconfigyaml.New(),
			".env":  aconfigdotenv.New(),
		},
	})

	if err := loader.Load(); err != nil {
		log.Fatalf("could not load config: %v", err)
	}

	log.Printf("Config: %+v", cfg)
}

config.yaml

items:
  arrs:
    - enabled: true
      str: asdasd
      nest_struct:
        key: value
      data:
        key: value
        bool: true

Errors:

• 2025/03/11 09:02:24 could not load config: load config: load files: provided value type do not match struct field type (main.StringType and string)
• 2025/03/11 09:01:44 could not load config: load config: load files: no such field "Nested_struct" in struct

[cristaloleg]

Hey, sorry for the bug. Wanna make a PR ?

[sxwebdev]

Hey, sorry for the bug. Wanna make a PR ?

At the moment I have no opportunity because I am busy, but I would be very grateful if you could fix the issue.

[cristaloleg]

Same for me now.

[d-enk]

aconfig/reflection.go

Lines 384 to 409 in 7111e04

	if structFieldValue.Type() != val.Type() {
	if structFieldValue.Kind() == reflect.Slice && val.Kind() == reflect.Slice {
	vals := value.([]interface{})
	slice := reflect.MakeSlice(structFieldValue.Type(), len(vals), len(vals))
	if isPrimitive(structFieldValue.Type().Elem()) {
	for i := 0; i < len(vals); i++ {
	fd := l.newFieldData(reflect.StructField{}, slice.Index(i), nil)
	if err := l.setFieldData(fd, vals[i]); err != nil {
	return fmt.Errorf("incorrect slice item %q: %w", vals[i], err)
	}
	}
	} else {
	for i := 0; i < len(vals); i++ {
	a := mii(vals[i])
	b := slice.Index(i)
	if err := l.m2s(a, b); err != nil {
	return err
	}
	}
	}
	structFieldValue.Set(slice)
	continue
	} else {
	return fmt.Errorf("provided value type do not match struct field type (%v and %v)", structFieldValue.Type(), val.Type())
	}
	}

The whole problem is this function is too complicated and does not do its job...