CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3
server info
server info

Reputation: 1335

how to proper cache a variable in rails

Hi I have a rails App which displays always the company name on each page. Since a logged in user can have multiple companies she belongs to. User and companies are stored in the db. I use authlogic for the user management.

Now I do not want to hit the database on every postback or page change What would be best practise to chache/store the company until the logged in users changes or the user selects a different company? Something like global instance vars for a given user.

I started with this in my application_controller

def current_company
  return @current_company if defined?(@current_company)
  @current_company = Account.includes(:users).where(:users =>current_company)
end

and I realized that I am still hitting the db...

Is the session the recommended way or what would be best practice for this...

Thanks for the help in advance

Upvotes: 0

Views: 969

Answers (2)

Juan Vidal
Juan Vidal

Reputation: 571

||= way:

def current_company
  @current_company ||= Account.includes(:users).where(:users =>current_company)
end

memoize way:

def current_company
  Account.includes(:users).where(:users =>current_company)
end
memoize :current_company

Differences between this method and normal memoization with ||=

http://apidock.com/rails/ActiveSupport/memoize#447-Differences-between-normal-or-assign-operator

@tadman, you are right but from my point of view depends how complex its the method that you are trying to "cache". For simple cases I prefer ||=

Upvotes: 2

Shreyas
Shreyas

Reputation: 8757

I think this is what you're looking for https://github.com/nkallen/cache-money

Upvotes: 0

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