AR::AttributeMethods#[] raises AM::AttributeMissingError for missing attributes.
This fixes the following behaviour: class Person < ActiveRecord::Base belongs_to :company end # Before: person = Person.select('id').first person[:name] # => nil person.name # => ActiveModel::MissingAttributeError: missing_attribute: name person[:company_id] # => nil person.company # => nil # After: person = Person.select('id').first person[:name] # => ActiveModel::MissingAttributeError: missing_attribute: name person.name # => ActiveModel::MissingAttributeError: missing_attribute: name person[:company_id] # => ActiveModel::MissingAttributeError: missing_attribute: company_id person.company # => ActiveModel::MissingAttributeError: missing_attribute: company_id Fixes #5433.
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