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 131

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 119

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

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

  return 0
end

#sibling_index=(index) ⇒ Object 



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# File 'lib/active_record_survey/node/answer.rb', line 108

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