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# frozen_string_literal: true
class UserGroupNotificationSettingsFinder
def initialize(user, groups)
@user = user
@groups = groups
end
def execute
groups_with_ancestors = groups.self_and_ancestors
@loaded_groups_with_ancestors = groups_with_ancestors.index_by(&:id)
@loaded_notification_settings = user.notification_settings_for_groups(groups_with_ancestors).preload_source_route.index_by(&:source_id)
preload_emails_disabled
groups.map do |group|
find_notification_setting_for(group)
end
end
private
attr_reader :user, :groups, :loaded_groups_with_ancestors, :loaded_notification_settings
def find_notification_setting_for(group)
return loaded_notification_settings[group.id] if loaded_notification_settings[group.id]
return user.notification_settings.build(source: group) if group.parent_id.nil?
parent_setting = loaded_notification_settings[group.parent_id]
return user.notification_settings.build(source: group) unless parent_setting
if should_copy?(parent_setting)
user.notification_settings.build(source: group) do |ns|
ns.assign_attributes(parent_setting.slice(*NotificationSetting.allowed_fields))
end
else
find_notification_setting_for(loaded_groups_with_ancestors[group.parent_id])
end
end
def should_copy?(parent_setting)
return false unless parent_setting
parent_setting.level != NotificationSetting.levels[:global] || parent_setting.notification_email.present?
end
# This method preloads the `emails_disabled` strong memoized method for the given groups.
#
# For each group, look up the ancestor hierarchy and look for any group where emails_disabled is true.
# The lookup is implemented with an EXISTS subquery, so we can look up the ancestor chain for each group individually.
# The query will return groups where at least one ancestor has the `emails_disabled` set to true.
#
# After the query, we set the instance variable.
def preload_emails_disabled
group_ids_with_disabled_email = Group.ids_with_disabled_email(groups.to_a)
groups.each do |group|
group.emails_disabled_memoized = group_ids_with_disabled_email.include?(group.id) if group.parent_id
end
end
end
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