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# frozen_string_literal: true
# Base class for services that count a single resource such as the number of
# issues for a project.
class BaseCountService
def relation_for_count
raise(
NotImplementedError,
'"relation_for_count" must be implemented and return an ActiveRecord::Relation'
)
end
def count
Rails.cache.fetch(cache_key, cache_options) { uncached_count }.to_i
end
def count_stored?
Rails.cache.read(cache_key).present?
end
def refresh_cache(&block)
update_cache_for_key(cache_key, &block)
end
def uncached_count
relation_for_count.count
end
def delete_cache
Rails.cache.delete(cache_key)
end
def raw?
false
end
def cache_key
raise NotImplementedError, 'cache_key must be implemented and return a String'
end
# subclasses can override to add any specific options, such as
# super.merge({ expires_in: 5.minutes })
def cache_options
{ raw: raw? }
end
def update_cache_for_key(key, &block)
Rails.cache.write(key, block_given? ? yield : uncached_count, raw: raw?)
end
end
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