[Fix rubocop#1039] Deprecate Rails/ActionFilter cop

Fixes rubocop#1039. This PR deprecates `Rails/ActionFilter` cop. Because the `*_filter` methods were removed in Rails 4.2, and that Rals version is no longer supported by RuboCop Rails. This cop will be removed in RuboCop Rails 3.0.
koic · Oct 10, 2023 · 1874ad8 · 1874ad8
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diff --git a/changelog/change_deprecate_rails_action_filter_cop.md b/changelog/change_deprecate_rails_action_filter_cop.md
@@ -0,0 +1 @@
+* [#1039](https://github.com/rubocop/rubocop-rails/issues/1039): Deprecate `Rails/ActionFilter` cop. ([@koic][])
diff --git a/lib/rubocop/cop/rails/action_filter.rb b/lib/rubocop/cop/rails/action_filter.rb
@@ -8,6 +8,9 @@ module Rails
       # The cop is configurable and can enforce the use of the older
       # something_filter methods or the newer something_action methods.
       #
+      # IMPORTANT: This cop is deprecated. Because the `*_filter` methods were removed in Rails 4.2,
+      # and that Rals version is no longer supported by RuboCop Rails. This cop will be removed in RuboCop Rails 3.0.
+      #
       # @example EnforcedStyle: action (default)
       #   # bad
       #   after_filter :do_stuff