Methods
D
P
Q
Instance Public methods
dangerous_attribute_method?(method_name)

Source: show | on GitHub 

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 42
def dangerous_attribute_method?(method_name)
  super && !['id', 'id=', 'id?'].include?(method_name)
end
define_method_attribute(attr_name)

Source: show | on GitHub 

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 28
        def define_method_attribute(attr_name)
          super

          if attr_name == primary_key && attr_name != 'id'
            generated_attribute_methods.send(:alias_method, :id, primary_key)
            generated_external_attribute_methods.module_eval "              def id(v, attributes, attributes_cache, attr_name)
                attr_name = '#{primary_key}'
                send(attr_name, attributes[attr_name], attributes, attributes_cache, attr_name)
              end
", __FILE__, __LINE__
          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.

Source: show | on GitHub 

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 48
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"

Source: show | on GitHub 

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 101
def primary_key=(value)
  @original_primary_key = @primary_key if defined?(@primary_key)
  @primary_key          = value && value.to_s
  @quoted_primary_key   = nil
end
quoted_primary_key()

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

Source: show | on GitHub 

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 54
def quoted_primary_key
  @quoted_primary_key ||= connection.quote_column_name(primary_key)
end