Flowdock
method

hash_cache

Importance_2
Ruby on Rails latest stable (v6.1.7.7) - 0 notes - Class: ActiveSupport::CachingTools::HashCaching
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  • What's this?

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v1.2.6) is shown here.

hash_cache(method_name, options = {}) public

Dynamically create a nested hash structure used to cache calls to method_name The cache method is named +#{method_name}_cache+ unless :as => :alternate_name is given.

The hash structure is created using nested Hash.new. For example:

  def slow_method(a, b) a ** b end

can be cached using hash_cache :slow_method, which will define the method slow_method_cache. We can then find the result of a ** b using:

  slow_method_cache[a][b]

The hash structure returned by slow_method_cache would look like this:

  Hash.new do |as, a|
    as[a] = Hash.new do |bs, b|
      bs[b] = slow_method(a, b)
    end
  end

The generated code is actually compressed onto a single line to maintain sensible backtrace signatures.

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