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Ruby on Rails - Safe Constantize
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  Successful safe_constantize

User is an ActiveRecord or Mongoid class. Replace User with any Rails class in your project (even something like Integer or Array)

my_string = "User" # Capitalized string
  # => 'User'
my_constant = my_string.safe_constantize
  # => User
my_constant.all.count
  # => 18

my_string = "Array"
  # => 'Array'
my_constant = my_string.safe_constantize
  # => Array
my_constant.new(4)
  # => [nil, nil, nil, nil]
  Unsuccessful safe_constantize

This example will not work because the string passed in isn't recognized as a constant in the project. Even if you pass in "array", it won't work as it isn't capitalized.

my_string = "not_a_constant" 
  # => 'not_a_constant'
my_string.safe_constantize
  # => nil

my_string = "array" #Not capitalized!
  # => 'array'
my_string.safe_constantize
  # => nil



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