Module: Architect4r::HasNode::ClassMethods

Defined in:
lib/architect4r/has_node.rb

Instance Method Summary collapse

Instance Method Details

#has_node(attr_name, model_name, options = {}) ⇒ Object 



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# File 'lib/architect4r/has_node.rb', line 11

def has_node(attr_name, model_name, options={})
  
  #if self.respond_to?(:after_create)
    after_create :"architect4r_create_#{attr_name}"
    after_update :"architect4r_sync_#{attr_name}"
    after_destroy :"architect4r_destroy_#{attr_name}"
  #end
  
  # Create a neo4j node
  define_method("architect4r_create_#{attr_name}") do
    return nil unless self.id
    
    new_node = model_name.new
    new_node.write_attribute(:architect4r_sync_id, self.id)
    
    options[:sync].to_a.each do |prop|
      new_node.send("#{prop}=", self.send(prop))
    end
    
    if new_node.save
      new_node
    else
      nil
    end
    instance_variable_set("@#{attr_name}", new_node)
  end
  
  # Create a getter method
  define_method(attr_name) do
    # Only available if the database record is already created
    return nil unless self.id
    
    # Get or create the graph db node
    the_node = instance_variable_get("@#{attr_name}")
    the_node ||= begin
      linked_node = model_name.find_by_cypher("start s=node(#{model_name.model_root.id}) match s<-[:model_type]-d where d.architect4r_sync_id = #{self.id} return d", "d").first
      linked_node ||= self.send("architect4r_create_#{attr_name}")
      instance_variable_set("@#{attr_name}", linked_node)
    end
  end
  
  define_method("architect4r_destroy_#{attr_name}") do
    self.send("#{attr_name}").destroy
  end
  
  
  # Keep the graph node in sync, so it reflects the name
  #
  define_method("architect4r_sync_#{attr_name}") do
    changed = false
    
    options[:sync].to_a.each do |prop|
      if self.node.send("#{prop}") != self.send(prop)
        self.node.send("#{prop}=", self.send(prop))
        changed = true
      end
    end
    
    if changed
      self.node.save
    end
  end
  
end