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Module: ActiveRecord::AttributeMethods::Read

Relationships & Source Files
Namespace Children
Modules:
ClassMethods
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::ActiveSupport::Concern
Defined in: activerecord/lib/active_record/attribute_methods/read.rb

Overview

=====================================

Class Method Summary

::ActiveSupport::Concern - Extended

class_methods

Define class methods from given block.
included

Evaluate given block in context of base class, so that you can write class macros here.
prepended

Evaluate given block in context of base class, so that you can write class macros here.
append_features, prepend_features

Instance Method Summary

Instance Method Details

#_read_attribute(attr_name) Also known as: #attribute

This method is for internal use only.

Internal read without alias resolution. An uninitialized attribute returns nil.

[ GitHub ] 

  


# File 'activerecord/lib/active_record/attribute_methods/read.rb', line 50



def _read_attribute(attr_name) # :nodoc:
  @attributes.fetch_value!(attr_name)
rescue ActiveModel::MissingAttributeError
  raise if @attributes.key?(attr_name)
end


  








  

    #_read_attribute!(attr_name)  
  

  

    This method is for internal use only.
  



  

    
Internal read without alias resolution that raises for uninitialized attributes.

  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/attribute_methods/read.rb', line 57



def _read_attribute!(attr_name) # :nodoc:
  @attributes.fetch_value!(attr_name)
rescue ActiveModel::MissingAttributeError
  raise if @attributes.key?(attr_name)
  missing_attribute(attr_name, RUBY_VERSION >= "3.4" ? caller_locations : caller)
end


  








  

    #attribute(attr_name)   (private)
  



  

    
Alias for #_read_attribute.

  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/attribute_methods/read.rb', line 64



alias :attribute :_read_attribute


  








  

    #read_attr(attr_name)  
  

  

    This method is for internal use only.
  



  

    
Like #read_attribute, but attr_name must be a ::String and no block is
forwarded. An uninitialized attribute returns nil.

  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/attribute_methods/read.rb', line 42



def read_attr(attr_name) # :nodoc:
  attr_name = resolve_alias(attr_name)
  @attributes.fetch_value!(attr_name)
rescue ActiveModel::MissingAttributeError
  raise if @attributes.key?(attr_name)
end


  








  

    #read_attribute(attr_name, &block)  
  



  

    
Returns the value of the attribute identified by attr_name after it
has been type cast. For example, a date attribute will cast "2004-12-12"
to Date.new(2004, 12, 12). (For information about specific type
casting behavior, see the types under ::ActiveModel::Type.)

  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/attribute_methods/read.rb', line 34



def read_attribute(attr_name, &block)
  name = resolve_alias(attr_name.is_a?(Symbol) ? attr_name.name : attr_name.to_s)

  @attributes.fetch_value(name, &block)
end