fix: fix toSnakeCase to handle input in CamelCase format (#2245)

Author: orisano

internal/codegen/golang/field.go

@@ -2,6 +2,7 @@ package golang
 
 import (
 	"fmt"
+	"regexp"
 	"sort"
 	"strings"
 
@@ -57,7 +58,14 @@ func SetCaseStyle(name string, style string) string {
 	}
 }
 
+var camelPattern = regexp.MustCompile("[^A-Z][A-Z]+")
+
 func toSnakeCase(s string) string {
+	if !strings.ContainsRune(s, '_') {
+		s = camelPattern.ReplaceAllStringFunc(s, func(x string) string {
+			return x[:1] + "_" + x[1:]
+		})
+	}
 	return strings.ToLower(s)
 }
 

internal/codegen/golang/result.go

@@ -335,7 +335,7 @@ func columnsToStruct(req *plugin.CodeGenRequest, name string, columns []goColumn
 		colName := columnName(c.Column, i)
 		tagName := colName
 
-		// overide col/tag with expected model name
+		// override col/tag with expected model name
 		if c.embed != nil {
 			colName = c.embed.modelName
 			tagName = SetCaseStyle(colName, "snake")