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Constants

ID_ATTRIBUTE_METHODS = %w(id id= id? id_before_type_cast id_was id_in_database id_for_database).to_set
 
PRIMARY_KEY_NOT_SET = BasicObject.new
 

Instance Public methods

dangerous_attribute_method?(method_name)

Source: show 

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 97
def dangerous_attribute_method?(method_name)
  super && !ID_ATTRIBUTE_METHODS.include?(method_name)
end

instance_method_already_implemented?(method_name)

Source: show 

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 93
def instance_method_already_implemented?(method_name)
  super || primary_key && ID_ATTRIBUTE_METHODS.include?(method_name)
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 

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 104
def primary_key
  if PRIMARY_KEY_NOT_SET.equal?(@primary_key)
    @primary_key = reset_primary_key
  end
  @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 

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 159
def primary_key=(value)
  @primary_key        = derive_primary_key(value)
  @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.

Source: show 

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 117
def quoted_primary_key
  @quoted_primary_key ||= connection.quote_column_name(primary_key)
end