Class: ActiveRecordSurvey::Node::Answer

Inherits:
ActiveRecordSurvey::Node show all
Defined in:
lib/active_record_survey/node/answer.rb

Direct Known Subclasses

Boolean, Rank, Scale, Text

Defined Under Namespace

Classes: Boolean, Rank, Scale, Text

Instance Method Summary collapse

Methods inherited from ActiveRecordSurvey::Node

#answers, #has_instance_node_for_instance?, #instance_node_for_instance, #instance_node_path_to_root?, #is_answered_for_instance?, #validate_instance_node, #validate_parent_instance_node

Instance Method Details



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# File 'lib/active_record_survey/node/answer.rb', line 84

def build_link(to_node)
	if self.question.nil?
		raise ArgumentError.new "A question is required before calling #build_link"
	end

	super(to_node)
end

#move_down ⇒ Object

Moves answer down relative to other answers



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# File 'lib/active_record_survey/node/answer.rb', line 132

def move_down
	self.survey.node_maps.select { |i|
		i.node == self
	}.collect { |node_map|
		begin
			node_map.move_right
		rescue
		end
	}
end

#move_up ⇒ Object

Moves answer up relative to other answers



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# File 'lib/active_record_survey/node/answer.rb', line 120

def move_up
	self.survey.node_maps.select { |i|
		i.node == self
	}.collect { |node_map|
		begin
			node_map.move_left
		rescue
		end
	}
end

#next_question ⇒ Object

Returns the question that follows this answer



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# File 'lib/active_record_survey/node/answer.rb', line 34

def next_question
	self.survey.node_maps.select { |i|
		i.node == self && !i.marked_for_destruction?
	}.each { |answer_node_map|
		answer_node_map.children.each { |child|
			if !child.node.nil? && !child.marked_for_destruction?
				if child.node.class.ancestors.include?(::ActiveRecordSurvey::Node::Question)
					return child.node
				elsif child.node.class.ancestors.include?(::ActiveRecordSurvey::Node::Answer)
					return child.node.next_question 
				end
			else
				return nil
			end
		}
	}
	return nil
end

#question ⇒ Object

Returns the question that preceeds this answer



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# File 'lib/active_record_survey/node/answer.rb', line 15

def question
	self.survey.node_maps.select { |i|
		i.node == self
	}.collect { |node_map|
		if node_map.parent && node_map.parent.node
			# Question is not the next parent - recurse!
			if node_map.parent.node.class.ancestors.include?(::ActiveRecordSurvey::Node::Answer)
				node_map.parent.node.question
			else
				node_map.parent.node
			end
		# Root already
		else
			nil
		end
	}.first
end

#remove_link ⇒ Object

Removes the node_map from this answer to its next question



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# File 'lib/active_record_survey/node/answer.rb', line 54

def remove_link
	# not linked to a question - nothing to remove!
	return true if (question = self.next_question).nil?

	count = 0
	to_remove = []
	self.survey.node_maps.each { |node_map|
		if node_map.node == question
			if count > 0
				to_remove.concat(node_map.self_and_descendants)
			else
				node_map.parent = nil
				node_map.move_to_root unless node_map.new_record?
			end
			count = count + 1
		end

		if node_map.node == self
			node_map.children = []
		end
	}

	self.survey.node_maps.each { |node_map|
		if to_remove.include?(node_map)
			node_map.parent = nil
			node_map.mark_for_destruction
		end
	}
end

#sibling_index ⇒ Object

Gets index in sibling relationship



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# File 'lib/active_record_survey/node/answer.rb', line 93

def sibling_index
	node_maps = self.survey.node_maps

	if node_map = node_maps.select { |i| i.node == self }.first
		parent = node_map.parent

		children = node_maps.select { |i| i.parent && i.parent.node === parent.node }

		children.each_with_index { |nm, i|
			if nm == node_map
				return i
			end
		}
	end
end

#sibling_index=(index) ⇒ Object 



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# File 'lib/active_record_survey/node/answer.rb', line 109

def sibling_index=index
	current_index = self.sibling_index

	offset = index - current_index

	(1..offset.abs).each { |i|
		self.send(((offset > 0)? "move_down" : "move_up"))
	}
end

#validate_node(instance) ⇒ Object

Answer nodes are valid if their questions are valid! Validate this node against an instance



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# File 'lib/active_record_survey/node/answer.rb', line 5

def validate_node(instance)
	# Ensure each parent node to this node (the goal here is to hit a question node) is valid
	!self.survey.node_maps.select { |i|
		i.node == self
	}.collect { |node_map|
		node_map.parent.node.validate_node(instance)
	}.include?(false)
end