module ActiveRecord::AttributeMethods::PrimaryKey

def attribute_method?(attr_name)
  attr_name == "id" || super
end

Returns the primary key column's value.

def id
  _read_attribute(@primary_key)
end

Sets the primary key column's value.

def id=(value)
  _write_attribute(@primary_key, value)
end

Queries the primary key column's value.

def id?
  query_attribute(@primary_key)
end

Returns the primary key column's value before type cast.

def id_before_type_cast
  attribute_before_type_cast(@primary_key)
end

:nodoc:

def id_for_database # :nodoc:
  @attributes[@primary_key].value_for_database
end

Returns the primary key column's value from the database.

def id_in_database
  attribute_in_database(@primary_key)
end

Returns the primary key column's previous value.

def id_was
  attribute_was(@primary_key)
end

available.
Returns this record's primary key value wrapped in an array if one is

def to_key
  key = id
  [key] if key
end

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