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Successful safe_constantize

User is an ActiveRecord or Mongoid class. Replace User with any Rails class in our project.

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]

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