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require "set"
module ActiveRecord
module AttributeMethods
module PrimaryKey
extend ActiveSupport::Concern
# Returns this record's primary key value wrapped in an array if one is
# available.
def to_key
key = id
[key] if key
end
# Returns the primary key value.
def id
sync_with_transaction_state
_read_attribute(self.class.primary_key) if self.class.primary_key
end
# Sets the primary key value.
def id=(value)
sync_with_transaction_state
write_attribute(self.class.primary_key, value) if self.class.primary_key
end
# Queries the primary key value.
def id?
sync_with_transaction_state
query_attribute(self.class.primary_key)
end
# Returns the primary key value before type cast.
def id_before_type_cast
sync_with_transaction_state
read_attribute_before_type_cast(self.class.primary_key)
end
# Returns the primary key previous value.
def id_was
sync_with_transaction_state
attribute_was(self.class.primary_key)
end
def id_in_database
sync_with_transaction_state
attribute_in_database(self.class.primary_key)
end
private
def attribute_method?(attr_name)
attr_name == "id" || super
end
module ClassMethods
ID_ATTRIBUTE_METHODS = %w(id id= id? id_before_type_cast id_was id_in_database).to_set
def instance_method_already_implemented?(method_name)
super || primary_key && ID_ATTRIBUTE_METHODS.include?(method_name)
end
def dangerous_attribute_method?(method_name)
super && !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.
def primary_key
@primary_key = reset_primary_key unless defined? @primary_key
@primary_key
end
# Returns a quoted version of the primary key name, used to construct
# SQL statements.
def quoted_primary_key
@quoted_primary_key ||= connection.quote_column_name(primary_key)
end
def reset_primary_key #:nodoc:
if self == base_class
self.primary_key = get_primary_key(base_class.name)
else
self.primary_key = base_class.primary_key
end
end
def get_primary_key(base_name) #:nodoc:
if base_name && primary_key_prefix_type == :table_name
base_name.foreign_key(false)
elsif base_name && primary_key_prefix_type == :table_name_with_underscore
base_name.foreign_key
else
if ActiveRecord::Base != self && table_exists?
pk = connection.schema_cache.primary_keys(table_name)
suppress_composite_primary_key(pk)
else
"id"
end
end
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"
def primary_key=(value)
@primary_key = value && value.to_s
@quoted_primary_key = nil
@attributes_builder = nil
end
private
def suppress_composite_primary_key(pk)
return pk unless pk.is_a?(Array)
warn <<-WARNING.strip_heredoc
WARNING: Active Record does not support composite primary key.
#{table_name} has composite primary key. Composite primary key is ignored.
WARNING
end
end
end
end
end
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