Add create_or_find_by to save_bang.rb (#102)

Author: MaximeLaurenty

CHANGELOG.md

@@ -14,6 +14,7 @@
 
 * [#98](https://github.com/rubocop-hq/rubocop-rails/pull/98): Mark `Rails/ActiveRecordAliases` as `SafeAutoCorrect` false and disable autocorrect by default. ([@prathamesh-sonpatki][])
 * [#101](https://github.com/rubocop-hq/rubocop-rails/pull/101): Mark `Rails/SaveBang` as `SafeAutoCorrect` false and disable autocorrect by default. ([@prathamesh-sonpatki][])
+* [#102](https://github.com/rubocop-hq/rubocop-rails/pull/102): Include `create_or_find_by` in `Rails/SaveBang` cop. ([@MaximeLaurenty][])
 
 ## 2.2.1 (2019-07-13)
 
@@ -60,3 +61,4 @@
 [@brunvez]: https://github.com/brunvez
 [@santib]: https://github.com/santib
 [@prathamesh-sonpatki]: https://github.com/prathamesh-sonpatki
+[@MaximeLaurenty]: https://github.com/MaximeLaurenty

lib/rubocop/cop/rails/save_bang.rb

@@ -108,7 +108,7 @@ class SaveBang < Cop
         CREATE_CONDITIONAL_MSG = '`%<current>s` returns a model which is ' \
                                  'always truthy.'
 
-        CREATE_PERSIST_METHODS = %i[create
+        CREATE_PERSIST_METHODS = %i[create create_or_find_by
                                     first_or_create find_or_create_by].freeze
         MODIFY_PERSIST_METHODS = %i[save
                                     update update_attributes destroy].freeze