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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 = self.id
[key] if key
end
# Returns the primary key value
def id
read_attribute(self.class.primary_key)
end
# Sets the primary key value
def id=(value)
write_attribute(self.class.primary_key, value)
end
# Queries the primary key value
def id?
query_attribute(self.class.primary_key)
end
# Returns the primary key value before type cast
def id_before_type_cast
read_attribute_before_type_cast(self.class.primary_key)
end
protected
def attribute_method?(attr_name)
attr_name == 'id' || super
end
module ClassMethods
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 <<-CODE, __FILE__, __LINE__
def id(v, attributes, attributes_cache, attr_name)
attr_name = '#{primary_key}'
send(attr_name, attributes[attr_name], attributes, attributes_cache, attr_name)
end
CODE
end
end
ID_ATTRIBUTE_METHODS = %w(id id= id? id_before_type_cast).to_set
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. Since primary keys are usually protected from mass assignment,
# remember to let your database generate them or include the key in +attr_accessible+.
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:
return 'id' unless base_name && !base_name.blank?
case primary_key_prefix_type
when :table_name
base_name.foreign_key(false)
when :table_name_with_underscore
base_name.foreign_key
else
if ActiveRecord::Base != self && table_exists?
connection.schema_cache.primary_keys[table_name]
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)
@original_primary_key = @primary_key if defined?(@primary_key)
@primary_key = value && value.to_s
@quoted_primary_key = nil
end
end
end
end
end
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