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Module: ActiveRecord::AttributeMethods::PrimaryKey::ClassMethods

Relationships & Source Files
Defined in: activerecord/lib/active_record/attribute_methods/primary_key.rb

Constant Summary

Instance Attribute Summary

Instance Method Summary

Instance Attribute Details

#primary_key (rw)

Defines the primary key field – can be overridden in subclasses. Overwriting will negate any effect of the primary_key_prefix_type setting, though.

[ GitHub ] 

  


# File 'activerecord/lib/active_record/attribute_methods/primary_key.rb', line 72



def primary_key
  @primary_key = reset_primary_key unless defined? @primary_key
  @primary_key
end


  








  

    #primary_key=(value)   (rw)
  



  

    

Sets the name of the primary key column.



class Project < ActiveRecord::Base
  self.primary_key = 'sysid'
end



You can also define the #primary_key method yourself:



class Project < ActiveRecord::Base
  def self.primary_key
    'foo_' + super
  end
end

Project.primary_key # => "foo_id"


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/attribute_methods/primary_key.rb', line 120



def primary_key=(value)
  @primary_key        = value && value.to_s
  @quoted_primary_key = nil
  @attributes_builder = nil
end


  







Instance Method Details



  

    #dangerous_attribute_method?(method_name)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/attribute_methods/primary_key.rb', line 65



def dangerous_attribute_method?(method_name)
  super && !ID_ATTRIBUTE_METHODS.include?(method_name)
end


  








  

    #define_method_attribute(attr_name)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/attribute_methods/primary_key.rb', line 55



def define_method_attribute(attr_name)
  super

  if attr_name == primary_key && attr_name != 'id'
    generated_attribute_methods.send(:alias_method, :id, primary_key)
  end
end


  








  

    #quoted_primary_key  
  



  

    

Returns a quoted version of the primary key name, used to construct SQL statements.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/attribute_methods/primary_key.rb', line 79



def quoted_primary_key
  @quoted_primary_key ||= connection.quote_column_name(primary_key)
end