Class: ActiveRecordSurvey::Node::Question

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

Instance Method Summary collapse

Methods inherited from ActiveRecordSurvey::Node

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

Instance Method Details

#build_answer(answer_node) ⇒ Object

Build an answer off this node



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# File 'lib/active_record_survey/node/question.rb', line 66

def build_answer(answer_node)
	# A survey must either be passed or already present in self.node_maps
	if self.survey.nil?
		raise ArgumentError.new "A survey must be passed if ActiveRecordSurvey::Node::Question is not yet added to a survey"
	end

	# Cannot mix answer types
	# Check if not match existing - throw error
	if !self.answers.select { |answer|
		answer.class != answer_node.class
	}.empty?
		raise ArgumentError.new "Cannot mix answer types on question"
	end

	# Answers actually define how they're built off the parent node
	if answer_node.send(:build_answer, self)

		# If any questions existed directly following this question, insert after this answer
		self.survey.node_maps.select { |i|
			i.node == answer_node && !i.marked_for_destruction?
		}.each { |answer_node_map|
			self.survey.node_maps.select { |j|
				# Same parent
				# Is a question
				!j.marked_for_destruction? &&
				j.parent == answer_node_map.parent && j.node.class.ancestors.include?(::ActiveRecordSurvey::Node::Question)
			}.each { |j|
				answer_node_map.survey = self.survey
				j.survey = self.survey

				answer_node_map.children << j
			}
		}

		true
	end
end

#next_questions ⇒ Object

Returns the questions that follows this question (either directly or via its answers)



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# File 'lib/active_record_survey/node/question.rb', line 129

def next_questions
	list = []

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

	list.compact.uniq
end

#remove_answer(answer_node) ⇒ Object

Removes an answer



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# File 'lib/active_record_survey/node/question.rb', line 46

def remove_answer(answer_node)
	# A survey must either be passed or already present in self.node_maps
	if self.survey.nil?
		raise ArgumentError.new "A survey must be passed if ActiveRecordSurvey::Node::Question is not yet added to a survey"
	end

	if !answer_node.class.ancestors.include?(::ActiveRecordSurvey::Node::Answer)
		raise ArgumentError.new "::ActiveRecordSurvey::Node::Answer not passed"
	end

	# Cannot mix answer types
	# Check if not match existing - throw error
	if !self.answers.include?(answer_node)
		raise ArgumentError.new "Answer not linked to question"
	end

	answer_node.send(:remove_answer, self)
end

#remove_link ⇒ Object

Removes the node_map link from this question all of its next questions



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# File 'lib/active_record_survey/node/question.rb', line 105

def remove_link
	return true if (questions = self.next_questions).length === 0

	# Remove the link to any direct questions
	self.survey.node_maps.select { |i|
		i.node == self
	}.each { |node_map|
		self.survey.node_maps.select { |j|
			node_map.children.include?(j) 
		}.each { |child|
			if child.node.class.ancestors.include?(::ActiveRecordSurvey::Node::Question)
				child.parent = nil
				child.send((child.new_record?)? :destroy : :mark_for_destruction )
			end
		}
	}

	# remove link any answeres that have questions
	self.answers.collect { |i|
		i.remove_link
	}
end

#update_question_type(klass) ⇒ Object

Updates the answers of this question to a different type



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# File 'lib/active_record_survey/node/question.rb', line 11

def update_question_type(klass)
	if self.next_questions.length > 0
		raise RuntimeError.new "No questions can follow when changing the question type" 
	end

	nm = self.survey.node_maps

	answers = self.answers.collect { |answer|
		nm.select { |i|
			i.node == answer
		}
	}.flatten.uniq.collect { |answer_node_map|
		answer_node_map.move_to_root
		answer_node_map.survey = self.survey

		answer_node_map
	}.collect { |answer_node_map|
		answer_node_map.node.type = klass.to_s
		answer_node_map.node = answer_node_map.node.becomes(klass)
		answer_node_map.node.survey = self.survey
		answer_node_map.node.save

		answer_node_map.send((answer_node_map.new_record?)? :destroy : :mark_for_destruction)

		answer_node_map.node
	}.uniq

	answers.each { |answer|
		answer.survey = self.survey

		self.build_answer(answer)
	}
end

#validate_parent_instance_node(instance_node, child_node) ⇒ Object

Stop validating at the Question node



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# File 'lib/active_record_survey/node/question.rb', line 4

def validate_parent_instance_node(instance_node, child_node)
	!self.node_validations.collect { |node_validation|
		node_validation.validate_instance_node(instance_node, self)
	}.include?(false)
end