Module: Customize::Inherited

Defined in:
lib/customize/inherited.rb

Defined Under Namespace

Modules: ClassMethods

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/customize/inherited.rb', line 3

def self.included base
	base.extend ClassMethods

	base.has_one :inherit_node, :class_name=>Customize::InheritNode.name, :as=>:node, :dependent=>:destroy

	base.scope :ascents_for, lambda { |object, options={:include=>false}|
		ntn = Customize::InheritNode.table_name
		node = object.inherit_node
		condition_string = if options[:include]
												 "#{ntn}.left <= ? and #{ntn}.right >= ?"
											 else
												 "#{ntn}.left < ? and #{ntn}.right > ?"
											 end
		base.joins(:inherit_node).where(condition_string, node.left, node.right)
	}

	base.scope :descents_for, lambda { |object, options={:include=>false}|
		ntn = Customize::InheritNode.table_name
		node = object.inherit_node
		condition_string = if options[:include]
												 "#{ntn}.left >= ? and #{ntn}.right <= ?"
											 else
												 "#{ntn}.left > ? and #{ntn}.right < ?"
											 end
		base.joins(:inherit_node).where(condition_string, node.left, node.right)
	}

	base.after_create { |object|
		object.create_inherit_node
	}

	base.delegate :leaf?, :to=>:inherit_node

	base.before_destroy { |object|
		raise 'object should not have children when destroy' if object.inherit_node.children.size > 0
	}

	
	
end

Instance Method Details

#ascent_ids ⇒ Object 



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# File 'lib/customize/inherited.rb', line 106

def ascent_ids
	ascents.map(&:id)
end

#ascents(options = {:include=>false}) ⇒ Object 



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# File 'lib/customize/inherited.rb', line 89

def ascents options={:include=>false}
	return [] if new_record?
	self.class.ascents_for self, options
end

#children ⇒ Object 



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# File 'lib/customize/inherited.rb', line 69

def children
	inherit_node.children.collect(&:node)
end

#descent_ids ⇒ Object 



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# File 'lib/customize/inherited.rb', line 110

def descent_ids
	descents.map(&:id)
end

#descents ⇒ Object 



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# File 'lib/customize/inherited.rb', line 101

def descents
	return [] if new_record?
	self.class.descents_for self
end

#inherit(parent) ⇒ Object 



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# File 'lib/customize/inherited.rb', line 77

def inherit parent
	raise 'should be save first' if self.new_record?
	raise 'should be same class' if self.class != parent.class
	raise 'should not be self' if self.id == parent.id
	raise 'should not inherit descents' if self.descent_ids.include? parent.id
	raise 'should not inherit parent' if self.parent.try(:id) == parent.id
	self.class.transaction do
		inherit_node.destroy
		create_inherit_node(:parent_id=>parent.inherit_node.id)
	end
end

#inherit_association(name, options = {:include=>false}) ⇒ Object 



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# File 'lib/customize/inherited.rb', line 94

def inherit_association name, options={:include=>false}
	a = association(name)
	sql = ascents(options).joins(name).select("#{a.aliased_table_name}.#{a.klass.primary_key}").to_sql
	a.klass.from("(#{sql}) as subquery, #{a.klass.table_name}").
		where("#{a.klass.table_name}.#{a.klass.primary_key} = subquery.#{a.klass.primary_key}")
end

#label ⇒ Object 



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# File 'lib/customize/inherited.rb', line 73

def label
	self.to_s
end

#parent ⇒ Object 



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# File 'lib/customize/inherited.rb', line 65

def parent
	inherit_node.parent_node.try(:node)
end