Module: TemporalTables::TemporalClass

Defined in:
lib/temporal_tables/temporal_class.rb

Overview

This is mixed into all History classes.

Defined Under Namespace

Modules: ClassMethods, STIWithHistory

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/temporal_tables/temporal_class.rb', line 4

def self.included(base)
	base.class_eval do
		base.extend ClassMethods

		self.table_name += "_h"

		cattr_accessor :visited_associations
		@@visited_associations = []

		# The at_value field stores the time from the query that yielded
		# this record.
		attr_accessor :at_value

		class << self
			prepend STIWithHistory
		end

		# Iterates all associations, makes sure their history classes are
		# created and initialized, and modifies the associations to point
		# to the target classes' history classes.
		def self.temporalize_associations!
			reflect_on_all_associations.dup.each do |association|
				unless @@visited_associations.include?(association.name) || association.options[:polymorphic]
					@@visited_associations << association.name

					# Calling .history here will ensure that the history class
					# for this association is created and initialized
					clazz = association.class_name.constantize.history

					# Recreate the association, updating it to point at the
					# history class.  The foreign key is explicitly set since it's
					# inferred from the class_name, but shouldn't be in this case.
					send(association.macro, association.name,
						association.options.merge(
							class_name:  clazz.name,
							foreign_key: association.foreign_key,
							primary_key: clazz.orig_class.primary_key
						)
					)
				end
			end
		end
	end
end

Instance Method Details

#next ⇒ Object 



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# File 'lib/temporal_tables/temporal_class.rb', line 87

def next
	@next ||= history.where(self.class.arel_table[:eff_from].gt(eff_from)).first
end

#orig_class ⇒ Object 



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# File 'lib/temporal_tables/temporal_class.rb', line 71

def orig_class
	self.class.orig_class
end

#orig_id ⇒ Object 



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# File 'lib/temporal_tables/temporal_class.rb', line 75

def orig_id
	attributes[orig_class.primary_key]
end

#orig_obj ⇒ Object 



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# File 'lib/temporal_tables/temporal_class.rb', line 79

def orig_obj
	@orig_obj ||= orig_class.find_by_id orig_id
end

#prev ⇒ Object 



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# File 'lib/temporal_tables/temporal_class.rb', line 83

def prev
	@prev ||= history.where(self.class.arel_table[:eff_from].lt(eff_from)).last
end