Migrate emoji reactions

app/models/concerns/has_user_settings.rb

@@ -127,6 +127,10 @@ module HasUserSettings
     settings['hide_followers_count']
   end
 
+  def setting_visible_reactions
+    integer_cast_setting('visible_reactions', 0)
+  end
+
   def allows_report_emails?
     settings['notification_emails.report']
   end
@@ -170,4 +174,14 @@ module HasUserSettings
   def hide_all_media?
     settings['web.display_media'] == 'hide_all'
   end
+
+  def integer_cast_setting(key, min = nil, max = nil)
+    i = ActiveModel::Type::Integer.new.cast(settings[key])
+    # the cast above doesn't return a number if passed the string "e"
+    i = 0 unless i.is_a? Numeric
+    return min if !min.nil? && i < min
+    return max if !max.nil? && i > max
+
+    i
+  end
 end

app/models/user_settings.rb

@@ -18,6 +18,7 @@ class UserSettings
   setting :default_privacy, default: nil, in: %w(public unlisted private)
   setting :default_content_type, default: 'text/plain'
   setting :hide_followers_count, default: false
+  setting :visible_reactions, default: 6
 
   namespace :web do
     setting :crop_images, default: true

db/migrate/20230215074425_move_emoji_reaction_settings.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+class MoveEmojiReactionSettings < ActiveRecord::Migration[6.1]
+  class User < ApplicationRecord; end
+
+  MAPPING = {
+    setting_visible_reactions: 'visible_reactions',
+  }.freeze
+
+  class LegacySetting < ApplicationRecord
+    self.table_name = 'settings'
+
+    def var
+      self[:var]&.to_sym
+    end
+
+    def value
+      YAML.safe_load(self[:value], permitted_classes: [ActiveSupport::HashWithIndifferentAccess]) if self[:value].present?
+    end
+  end
+
+  def up
+    User.find_each do |user|
+      previous_settings = LegacySetting.where(thing_type: 'User', thing_id: user.id).index_by(&:var)
+
+      user_settings = Oj.load(user.settings || '{}')
+      user_settings.delete('theme')
+
+      MAPPING.each do |legacy_key, new_key|
+        value = previous_settings[legacy_key]&.value
+
+        next if value.blank?
+
+        if value.is_a?(Hash)
+          value.each do |nested_key, nested_value|
+            user_settings[MAPPING[legacy_key][nested_key.to_sym]] = nested_value
+          end
+        else
+          user_settings[new_key] = value
+        end
+      end
+
+      user.update_column('settings', Oj.dump(user_settings)) # rubocop:disable Rails/SkipsModelValidations
+    end
+  end
+
+  def down; end
+end