Feature sqlstate support (#215)

* feat: add error code for undefined column

* Add gorm.ErrInvalidField error for 42703 SQLSTATE.
* Add test for new supported error code.

Signed-off-by: alireza <alirezaarzehgar82@gmail.com>

* refactor: remove unnecessary json struct tags

new json fields names was same as struct field names.
It's default behavior of json package and we don't need them.

Signed-off-by: alireza <alirezaarzehgar82@gmail.com>

---------

Signed-off-by: alireza <alirezaarzehgar82@gmail.com>

error_translator.go

@@ -11,12 +11,13 @@ import (
 var errCodes = map[string]error{
 	"23505": gorm.ErrDuplicatedKey,
 	"23503": gorm.ErrForeignKeyViolated,
+	"42703": gorm.ErrInvalidField,
 }
 
 type ErrMessage struct {
-	Code     string `json:"Code"`
-	Severity string `json:"Severity"`
-	Message  string `json:"Message"`
+	Code     string
+	Severity string
+	Message  string
 }
 
 // Translate it will translate the error to native gorm errors.

error_translator_test.go

@@ -2,9 +2,10 @@ package postgres
 
 import (
 	"errors"
+	"testing"
+
 	"github.com/jackc/pgx/v5/pgconn"
 	"gorm.io/gorm"
-	"testing"
 )
 
 func TestDialector_Translate(t *testing.T) {
@@ -30,6 +31,11 @@ func TestDialector_Translate(t *testing.T) {
 			args: args{err: &pgconn.PgError{Code: "23503"}},
 			want: gorm.ErrForeignKeyViolated,
 		},
+		{
+			name: "it should return gorm.ErrInvalidField error if the status code is 42703",
+			args: args{err: &pgconn.PgError{Code: "42703"}},
+			want: gorm.ErrInvalidField,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {