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Methods
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Constants
ID_ATTRIBUTE_METHODS = %w(id id= id? id_before_type_cast id_was).to_set
 
Instance Public methods
dangerous_attribute_method?(method_name)
# 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)
# 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
primary_key()

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

# 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)

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"
# 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
quoted_primary_key()

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

# 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