Add FieldNameTag config

Allows field names to be based on a different tag.
Json is still the default tag so this is not a breaking change.
#28 (reply in thread)

reflect.go

@@ -183,6 +183,9 @@ type Reflector struct {
  // root as opposed to a definition with a reference.
  ExpandedStruct bool
 
+ // FieldNameTag will change the tag used to get field names. json tags are used by default.
+ FieldNameTag string
+
  // IgnoredTypes defines a slice of types that should be ignored in the schema,
  // switching to just allowing additional properties instead.
  IgnoredTypes []interface{}
@@ -989,7 +992,11 @@ func ignoredByJSONSchemaTags(tags []string) bool {
 }
 
 func (r *Reflector) reflectFieldName(f reflect.StructField) (string, bool, bool, bool) {
- jsonTagString, _ := f.Tag.Lookup("json")
+ tagKey := r.FieldNameTag
+ if tagKey == "" {
+ tagKey = "json"
+ }
+ jsonTagString := f.Tag.Get(tagKey)
  jsonTags := strings.Split(jsonTagString, ",")
 
  if ignoredByJSONTags(jsonTags) {