Set custom cache_key of Fragment Caching

SeongHoon_Ryu · September 1, 2018, 4:20pm

I want to cache with custom cache_key of Fragment Caching because I don’t want to change updated_at.

So, I googled and found monkeypatch(https://gist.github.com/tispratik/9276110). But It just a monkey patch.

Is there a way to set custom cache_key?

Thanks

Steve13 · September 24, 2018, 3:45pm

In Rails 5, you can turn cache versioning on and override #cache_version in your model if you’d like to return a different column.

github.com

rails/rails/blob/b2eb1d1c55a59fee1e6c4cba7030d8ceb524267c/activerecord/lib/active_record/integration.rb

# frozen_string_literal: true

require "active_support/core_ext/string/filters"

module ActiveRecord
  module Integration
    extend ActiveSupport::Concern

    included do
      ##
      # :singleton-method:
      # Indicates the format used to generate the timestamp in the cache key, if
      # versioning is off. Accepts any of the symbols in <tt>Time::DATE_FORMATS</tt>.
      #
      # This is +:usec+, by default.
      class_attribute :cache_timestamp_format, instance_writer: false, default: :usec

      ##
      # :singleton-method:
      # Indicates whether to use a stable #cache_key method that is accompanied

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In earlier versions of Rails, you can pass different column names to #cache_key, e.g., model.cache_key(:last_modified).

In either case, you can probably just override #cache_key in the model.