CODEWITHSUNDEEP
rubycachingruby-on-rails-4model-view-controller
Daniel
Daniel

Reputation: 7172

rails caching with anonymous classes

I want to cache the results of several large queries in an fragment cache.

I could store the values in a hash and then retrieve them before making the request, but I'm wondering if the processing request could be deferred until the data is actually needed.

Here is the before code:

# controller

class MyController < ApplicationController
  def my_action
    @my_huge_query_with_1_result = do_massive_question
  end
end

# my_action.html.slim

.header
  = cache do
    ' Your answer is
    = @my_huge_query_with_1_result

This is what I would LIKE the code to look like, with an anonymous object. However, I can't figure out how to pass in parameters.

# controller

class MyController < ApplicationController
  def my_action
    @my_cache = Object.new
    def @my_cache.do_query
      do_massive_question(params) # this fails; because params is not in the scope of @my_cache's class.
    end
  end
end

# my_action.html.slim

.header
  = cache do
    ' Your answer is
    = @my_cache.do_query

Does anyone have any thoughts on how to defer the processing until the very end?

Thank you in advance!

Upvotes: 0

Views: 121

Answers (1)

Chris Heald
Chris Heald

Reputation: 62668

The typical way to do this is with Procs/lambdas. You would then invoke it with #call.

def my_action
  @my_huge_query_with_1_result = ->{ do_massive_question(params) }
end

# View
.header
  = cache do
    ' Your answer is
    = @my_huge_query_with_1_result.call

Upvotes: 1

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