FIX: Rely on core for staff action logs (#176)

Previously, we were deleting the `enable_topic_voting` custom field param
and doing the staff logging in this plugin. This has a problem though, it
was being done in the model's create/destroy hooks and was missing the
acting user (so the logs would report the change as `system`).

This PR keeps the custom field param and relies on core to do the staff
action logging. This change also results in the custom field being set
in the DB when it is enabled even though we don't use it in the serializer.

app/models/discourse_topic_voting/category_setting.rb

@@ -8,8 +8,6 @@ class CategorySetting < ActiveRecord::Base
 
     before_create :unarchive_votes
     before_destroy :archive_votes
-    after_create :log_category_voting_enabled
-    after_destroy :log_category_voting_disabled
     after_save :reset_voting_cache
 
     def unarchive_votes
@@ -38,30 +36,6 @@ def archive_votes
     def reset_voting_cache
       ::Category.reset_voting_cache
     end
-
-    def log_category_voting_disabled
-      ::StaffActionLogger.new(Discourse.system_user).log_category_settings_change(
-        self.category,
-        { custom_fields: { enable_topic_voting: "false" } },
-        old_permissions: {
-        },
-        old_custom_fields: {
-          enable_topic_voting: "true",
-        },
-      )
-    end
-
-    def log_category_voting_enabled
-      ::StaffActionLogger.new(Discourse.system_user).log_category_settings_change(
-        self.category,
-        { custom_fields: { enable_topic_voting: "true" } },
-        old_permissions: {
-        },
-        old_custom_fields: {
-          enable_topic_voting: "false",
-        },
-      )
-    end
   end
 end
 

lib/discourse_topic_voting/categories_controller_extension.rb

@@ -4,7 +4,7 @@ module DiscourseTopicVoting
   module CategoriesControllerExtension
     def category_params
       @vote_enabled ||=
-        !!ActiveRecord::Type::Boolean.new.cast(params[:custom_fields]&.delete(:enable_topic_voting))
+        !!ActiveRecord::Type::Boolean.new.cast(params[:custom_fields][:enable_topic_voting])
 
       category_params = super
 

plugin.rb

@@ -96,6 +96,7 @@ class Engine < ::Rails::Engine
     end
   end
 
+  register_category_custom_field_type("enable_topic_voting", :boolean)
   add_to_serializer(:category, :custom_fields, respect_plugin_enabled: false) do
     return object.custom_fields if !SiteSetting.voting_enabled