1 files changed, 15 insertions, 0 deletions
diff --git a/models/error.go b/models/error.go
index 396d7594c8..f0d5699aad 100644
--- a/models/error.go
+++ b/models/error.go
@@ -1201,6 +1201,21 @@ func (err ErrForbiddenIssueReaction) Error() string {
 	return fmt.Sprintf("'%s' is not an allowed reaction", err.Reaction)
 }
 
+// ErrReactionAlreadyExist is used when a existing reaction was try to created
+type ErrReactionAlreadyExist struct {
+	Reaction string
+}
+
+// IsErrReactionAlreadyExist checks if an error is a ErrReactionAlreadyExist.
+func IsErrReactionAlreadyExist(err error) bool {
+	_, ok := err.(ErrReactionAlreadyExist)
+	return ok
+}
+
+func (err ErrReactionAlreadyExist) Error() string {
+	return fmt.Sprintf("reaction '%s' already exists", err.Reaction)
+}
+
 // __________      .__  .__ __________                                     __
 // \______   \__ __|  | |  |\______   \ ____  ________ __   ____   _______/  |_
 //  |     ___/  |  \  | |  | |       _// __ \/ ____/  |  \_/ __ \ /  ___/\   __\