diff options
Diffstat (limited to 'activerecord/lib/active_record/attribute_methods.rb')
| -rw-r--r-- | activerecord/lib/active_record/attribute_methods.rb | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb index 9a4fcdfda3..101c641877 100644 --- a/activerecord/lib/active_record/attribute_methods.rb +++ b/activerecord/lib/active_record/attribute_methods.rb @@ -266,16 +266,22 @@ module ActiveRecord # Returns the value of the attribute identified by <tt>attr_name</tt> after it has been typecast (for example, # "2004-12-12" in a data column is cast to a date object, like Date.new(2004, 12, 12)). - # (Alias for the protected <tt>read_attribute</tt> method). + # (Alias for the protected <tt>read_attribute</tt> method). It raises an <tt>ActiveModel::MissingAttributeError</tt> + # error if the identified attribute is missing. # # class Person < ActiveRecord::Base + # belongs_to :organization # end # # person = Person.new(name: 'Francesco', age: '22' # person[:name] # => "Francesco" # person[:age] # => 22 + # + # person = Person.select('id').first + # person[:name] # => ActiveModel::MissingAttributeError: missing attribute: name + # person[:organization_id] # => ActiveModel::MissingAttributeError: missing attribute: organization_id def [](attr_name) - read_attribute(attr_name) + read_attribute(attr_name) { |n| missing_attribute(n, caller) } end # Updates the attribute identified by <tt>attr_name</tt> with the specified +value+. |