At times, we need to set class constants in Ruby, something like:

class Foo
  BAR = Rails.application.secrets.BAZ['BAR']

This gets messy at times when we want to declare a lot of constants, by reading the same variable name from secrets.yml or env.
After a bit of research, I came across a helpful utility provided by ruby, const_set.

We can use it like:

module A
  # To fasciliate in time submission of karvy orders
  class B
    %w[E F G H].each do |cred|
      const_set(cred, Rails.application.secrets.['X'][cred])

A similar utility is const_get, which is quite self explanatory for what it does.