module ActiveRecord::AttributeMethods::PrimaryKey::ClassMethods
Constants
%w(id id= id? id_before_type_cast id_was id_in_database id_for_database).to_set
Public instance methods
Source code GitHub
# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 75
def dangerous_attribute_method?(method_name)
super && !ID_ATTRIBUTE_METHODS.include?(method_name)
end
Source code GitHub
# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 71
def instance_method_already_implemented?(method_name)
super || primary_key && ID_ATTRIBUTE_METHODS.include?(method_name)
end
Defines the primary key field – can be overridden in subclasses. Overwriting will negate any effect of the primary_key_prefix_type
setting, though.
Source code GitHub
# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 82
def primary_key
reset_primary_key if PRIMARY_KEY_NOT_SET.equal?(@primary_key)
@primary_key
end
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 code GitHub
# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 133
def primary_key=(value)
@primary_key = if value.is_a?(Array)
@composite_primary_key = true
include CompositePrimaryKey
@primary_key = value.map { |v| -v.to_s }.freeze
elsif value
-value.to_s
end
@quoted_primary_key = nil
@attributes_builder = nil
end
Returns a quoted version of the primary key name, used to construct SQL statements.
Source code GitHub
# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 94
def quoted_primary_key
@quoted_primary_key ||= adapter_class.quote_column_name(primary_key)
end