Extend Hash Class in Rails Application
hash, ruby-on-rails
Solution
You could resolve this issue in a few different ways:
Assuming that `hash_extensions.rb` resides under `your_app/lib/extensions`. (It's a good idea to store all extensions in a separate folder), require all extensions in `config/application.rb` as below:
Dir[File.join(Rails.root, "lib", "extensions", "*.rb")].each {|l| require l }
Move `hash_extensions.rb` under `config/initializers` and it should be automoagically loaded.
- Create a folder say `lib` or `extensions` under `your_app/app` and move `hash_extensions.rb` to it and Rails would take care of loading it.
Problem
I have a rails application where I need to extend the `Hash` module to add a method - ``` class Hash def delete_blank delete_if{|k, v| v.nil? or (v.instance_of?(Hash) and v.delete_blank.empty?)} end end ``` I have created a filed named, hash_extensions.rb and placed this in my lib folder and of course configured autoloading paths with the following line in `config/application.rb` ``` config.autoload_paths += %W(#{config.root}/lib) ``` When I call the delete blank method on a Hash however, I get the below error - ``` undefined method `delete_blank' for #<Hash:0x000000081ceed8>\nDid you mean? delete_if ``` In addition to this, I have also tried placing `require "hash_extensions"` at the top of the file I am calling the delete_blank method from. What am I doing wrong here or can I avoid extending Hash to have the same functionality?