Method: ActiveRecord::Integration#cache_version

Defined in:
activerecord/lib/active_record/integration.rb

#cache_version ⇒ Object

Returns a cache version that can be used together with the cache key to form a recyclable caching scheme. By default, the #updated_at column is used for the cache_version, but this method can be overwritten to return something else.

Note, this method will return nil if ActiveRecord::Base.cache_versioning is set to false.



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# File 'activerecord/lib/active_record/integration.rb', line 97

def cache_version
  return unless cache_versioning

  if has_attribute?("updated_at")
    timestamp = updated_at_before_type_cast
    if can_use_fast_cache_version?(timestamp)
      raw_timestamp_to_cache_version(timestamp)

    elsif timestamp = updated_at
      timestamp.utc.to_fs(cache_timestamp_format)
    end
  elsif self.class.has_attribute?("updated_at")
    raise ActiveModel::MissingAttributeError, "missing attribute 'updated_at' for #{self.class}"
  end
end