Trouble with low level caching in rails - ruby-on-rails

Question

I have some issues with caching in rails. I don't find how should i setting it.
Here's the code :
submit_key = nil
pairs_email = Hash.new
pairs_type = Rails.cache.fetch("cache_typeform", :expires_in => 1.day) do
(0..9).each do
if submit_key.present?
url = "https://api.typeform.com/forms/#{typeform_id}/responses?page_size=1000&until=#{submit_key}"
response = RestClient.get url, {:Authorization => 'Bearer XXXXXXXXXXX'}
parsed = JSON.parse(response.body)
else
response = RestClient.get "https://api.typeform.com/forms/#{typeform_id}/responses?page_size=1000", {:Authorization => 'Bearer XXXXXXXXXXXXXXX}
parsed = JSON.parse(response.body)
end
parsed['items'].each do |item|
pairs_email[item['hidden']['email']] = item['token'] if item['hidden']['email'].present?
end
submit_key = parsed['items'][-1]['submitted_at'].chop
end
end
Then it should return a pairs containing an email and an ID and this pairs is used after to get more informations. However, nothing is returning.
Does someone can tell me what I've done wrong in my code? Am I missing something somewhere?
UPDATE
I want to use my cache for getting informations from the typeform API :
results = Hash.new
if pairs_email[email].present?
url = "https://api.typeform.com/v1/form/#{typeform_id}?key=#{ENV['TYPEFORM_API_KEY']}&token=#{pairs_email[email]}"
response = RestClient.get(url)
parsed = JSON.parse(response.body)
results["email"] = parsed["responses"][0]["hidden"]["email"] # Email
results["first_name"] = parsed["responses"][0]["answers"]["textfield_25078009"] # prénom
results["last_name"] = parsed["responses"][0]["answers"]["textfield_25078014"] # nom
results["phone_number"] = parsed["responses"][0]["answers"]["textfield_25444504"] #N°
results["job"] = parsed["responses"][0]["answers"]["textfield_24904749"] # métier
results["status_legal"] = parsed["responses"][0]["answers"]["list_24904751_choice"] # statut légal ?
results["birthdate"] = parsed["responses"][0]["answers"]["date_24904754"] # Date de naissance
results["zipcode"] = parsed["responses"][0]["answers"]["number_24904755"] # Code postal
results["has_partner"] = parsed["responses"][0]["answers"]["yesno_53894471"] # has_partner
results["children"] = parsed["responses"][0]["answers"]["list_53894494_choice"] # Nombre d'enfants
results["optical_option"] = parsed["responses"][0]["answers"]["list_24904752_choice_32209601"] # optical_option
results["dental_option"] = parsed["responses"][0]["answers"]["list_24904752_choice_32209602"] # dental_option
results["sick_15d"] = parsed["responses"][0]["answers"]["list_24904752_choice_32209603"] # Sick_15d
results["target_year"] = parsed["responses"][0]["answers"]["list_24905736_choice"] # target_year
results["monthly_income"] = parsed["responses"][0]["answers"]["number_24904756"] # monthly_income
results["independent"] = parsed["responses"][0]["answers"]["yesno_53895024"] # independent_1_year
#results["subject_to_discuss"] = parsed["responses"][0]["answers"]["textarea_24904759"] # Avez-vous des sujets dont vous voulez discuter
end

Answer 1

Here's something you must try before getting caching right. Attaching a screenshot from my machine.
Also if you are in development environment you would need to enable caching to see the effect. You could add config.action_controller.perform_caching = true and config.cache_store = :memory_store, { size: 64.megabytes } to your development.rb config file to enable caching.
This is just an idea of how caching happens and check if it really works, this should help you get going with your task.

Answer 2

Rails.cache.fetch stores the value evaluated from the block passed into this method (if there is one, of course). In your example, you're returning (0..9) range from the block, instead of actually evaluated [email id] pairs.