Error code docs

docs/content/doc/usage/errors.md

@@ -33,6 +33,7 @@ This document describes the different errors Vikunja can return.
 | 3004 | 403 | The user needs to have read permissions on that list to perform that action. |
 | 3005 | 400 | The list title cannot be empty. |
 | 3006 | 404 | The list share does not exist. |
+| 3007 | 400 | A list with this identifier already exists. |
 | 4001 | 400 | The list task text cannot be empty. |
 | 4002 | 404 | The list task does not exist. |
 | 4003 | 403 | All bulk editing tasks must belong to the same list. |

pkg/models/error.go

@@ -491,7 +491,11 @@ const ErrCodeListIdentifierIsNotUnique = 3007
 
 // HTTPError holds the http error description
 func (err ErrListIdentifierIsNotUnique) HTTPError() web.HTTPError {
-	return web.HTTPError{HTTPCode: http.StatusNotFound, Code: ErrCodeListIdentifierIsNotUnique, Message: "There already exists a list with this identifier."}
+	return web.HTTPError{
+		HTTPCode: http.StatusBadRequest,
+		Code:     ErrCodeListIdentifierIsNotUnique,
+		Message:  "A list with this identifier already exists.",
+	}
 }
 
 // ================