[](attr_name) public

Returns the value of the attribute identified by attr_name after it has been type cast. (For information about specific type casting behavior, see the types under ActiveModel::Type.)

class Person < ActiveRecord::Base
  belongs_to :organization
end

person = Person.new(name: "Francesco", date_of_birth: "2004-12-12")
person[:name]            # => "Francesco"
person[:date_of_birth]   # => Date.new(2004, 12, 12)
person[:organization_id] # => nil

Raises ActiveModel::MissingAttributeError if the attribute is missing. Note, however, that the id attribute will never be considered missing.

person = Person.select(:name).first
person[:name]            # => "Francesco"
person[:date_of_birth]   # => ActiveModel::MissingAttributeError: missing attribute 'date_of_birth' for Person
person[:organization_id] # => ActiveModel::MissingAttributeError: missing attribute 'organization_id' for Person
person[:id]              # => nil
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