How to filter nested hash in Ruby on Rails?

Question

In my Rails 4 application I have a (non-ActiveRecord) model containing the plans that a user can subscribe to:

class Plan

  PLANS = {
    'free'            => { :name => "Free",     :amount => 0,     :interval => '',   :maximum => FREE_MAXIMUM },
    'basic_monthly'   => { :name => "Basic",    :amount => 500,   :interval => 'month', :maximum => BASIC_MAXIMUM },
    'basic_yearly'    => { :name => "Basic",    :amount => 5000,  :interval => 'year',  :maximum => BASIC_MAXIMUM },
    'premium_monthy'  => { :name => "Premium",  :amount => 1000,  :interval => 'month', :maximum => PREMIUM_MAXIMUM },
    'premium_yearly'  => { :name => "Premium",  :amount => 10000, :interval => 'year',  :maximum => PREMIUM_MAXIMUM }
  }

  def self.all
    ...
  end

  def self.all_payable
    ...
  end

  def self.by_interval(interval)
    ...
  end

end

I have worked with ActiveRecord a lot but in this case I don't know how to filter the hash values so I can render them out to the front end.

class PagesController < ApplicationController

  def pricing
    @plans = Plan.all
  end

end

How can this be done?

Maybe my approach is entirely wrong and it's easier to store the plans in an array?

Thanks for any help.

what filters are you trying to apply. Please supply output examples. by the way I think the methods you want are Enumerable#find_all or Enumerable#select and then in the block use standard Hash access methods — engineersmnky
– engineersmnky, Commented Jan 15, 2015 at 18:40

Tintin81 · Accepted Answer · 2015-01-16 13:49:18Z

1

An array or a hash would work for this. If I understand you correctly, your methods should look something like this.

def self.all
  # returns the entire PLANS hash
  PLANS
end

def self.all_payable
  # only return hash elements that are not free
  PLANS.find_all { |k,v| v[:name] != 'Free' }
end

def self.by_interval(interval)
  # return all elements where the :interval matches interval
  PLANS.find_all { |k,v| v[:interval] == interval }
end

Hope this helps!

edited Jan 16, 2015 at 13:49

Tintin81

10.3k20 gold badges95 silver badges184 bronze badges

answered Jan 15, 2015 at 18:55

ptierno

10.1k2 gold badges26 silver badges37 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Tintin81 Over a year ago

Thank you. I think I am pretty close to what I need now. The only problem is that I get errors like undefined method 'name' for #<Array:0x00000101a47308> when trying to use these methods on the front end like I used to with ActiveRecord. Will I have to convert them to an ActiveRecord::Relation or something similar maybe?

ptierno Over a year ago

well there is no name method there. The way your are doing it you are pretty much going to have to rewrite functionality that exists in active record.

Collectives™ on Stack Overflow

How to filter nested hash in Ruby on Rails?

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related