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module ActiveRecord
module AttributeMethods
module PrimaryKey
extend ActiveSupport::Concern
# Returns this record's primary key value wrapped in an Array or nil if
# the record is not persisted? or has just been destroyed.
def to_key
key = send(self.class.primary_key)
[key] if key
end
module ClassMethods
# 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
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:
key = self == base_class ? get_primary_key(base_class.name) :
base_class.primary_key
set_primary_key(key)
key
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 && connection.table_exists?(table_name)
connection.primary_key(table_name)
else
'id'
end
end
end
attr_accessor :original_primary_key
# Attribute writer for the primary key column
def primary_key=(value)
@quoted_primary_key = nil
@primary_key = value
end
# Sets the name of the primary key column to use to the given value,
# or (if the value is nil or false) to the value returned by the given
# block.
#
# class Project < ActiveRecord::Base
# set_primary_key "sysid"
# end
def set_primary_key(value = nil, &block)
@quoted_primary_key = nil
@primary_key ||= ''
self.original_primary_key = @primary_key
value &&= value.to_s
connection_pool.primary_keys[table_name] = value
self.primary_key = block_given? ? instance_eval(&block) : value
end
end
end
end
end
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