allow struct tag, add test

go.mod

@@ -4,6 +4,7 @@ go 1.18
 
 require (
 	github.com/alicebob/miniredis/v2 v2.30.5
+	github.com/fatih/structtag v1.2.0
 	github.com/redis/go-redis/v9 v9.0.2
 	github.com/stretchr/testify v1.8.1
 )

go.sum

@@ -14,6 +14,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
+github.com/fatih/structtag v1.2.0 h1:/OdNE99OxoI/PqaW/SuSK9uxxT3f/tcSZgon/ssNSx4=
+github.com/fatih/structtag v1.2.0/go.mod h1:mBJUNpUnHmRKrKlQQlmCrh5PuhftFbNv8Ys4/aAZl94=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/redis/go-redis/v9 v9.0.2 h1:BA426Zqe/7r56kCcvxYLWe1mkaz71LKF77GwgFzSxfE=

utils.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/fatih/structtag"
 	"github.com/redis/go-redis/v9"
 )
 
@@ -166,7 +167,22 @@ func mapToStruct(st any, data map[string]any) error {
 		fieldRv := rv.Field(i)
 		fieldRt := rt.Field(i)
 
-		v, ok := data[toSnakeCase(fieldRt.Name)]
+		fieldTag := fieldRt.Tag
+		tags, err := structtag.Parse(string(fieldTag))
+		if err != nil {
+			// failing to parse a struct tag means = tag is invalid = we should panic
+			panic(err)
+		}
+
+		var fieldName string
+		gtrsTag, err := tags.Get("gtrs")
+		if err == nil {
+			fieldName = gtrsTag.Name
+		} else {
+			fieldName = toSnakeCase(fieldRt.Name)
+		}
+
+		v, ok := data[fieldName]
 		if !ok {
 			continue
 		}

utils_test.go

@@ -16,6 +16,12 @@ type Person struct {
 	Height float32
 }
 
+type TaggedPerson struct {
+	Name   string
+	Age    int
+	Height float32 `gtrs:"cm"`
+}
+
 type City struct {
 	Name string
 	Size int
@@ -61,6 +67,20 @@ func TestUtils_convertMapToStruct_Simple(t *testing.T) {
 	assert.Equal(t, Person{Name: "Vlad", Age: 19, Height: 172.0}, p1)
 }
 
+func TestUtils_convertMapToStruct_Tags(t *testing.T) {
+	m1 := map[string]any{
+		"name": "Vlad",
+		"age":  "19",
+		"cm":   "172",
+	}
+
+	var p1 TaggedPerson
+	err := mapToStruct(&p1, m1)
+
+	assert.Nil(t, err)
+	assert.Equal(t, TaggedPerson{Name: "Vlad", Age: 19, Height: 172.0}, p1)
+}
+
 func TestUtils_convertMapToStruct_AllTypes(t *testing.T) {
 	type AllTypes struct {
 		S   string