Class: Neo4j::Rails::Model

Inherits:
Object
  • Object
show all
Defined in:
lib/neo4j_helper/accepts_hash_for.rb

Class Method Summary collapse

Class Method Details

.accepts_hash_for(prop, *block) ⇒ Object

This allows anything to be thrown at a relationship and understood. usage:

has_one(:location).to(Location) accepts_hash_for :location

Will run Location.new with the passed in :location hash. You can also give it a block which returns a location node:

accepts_hash_for :location do |location_attributes|

Location.find_or_create_by(:name => location_attributes[:name])

end



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# File 'lib/neo4j_helper/accepts_hash_for.rb', line 19

def accepts_hash_for(prop, *block)
  # todo: handle persistence?
  # for working with this method, see these neo4j examples:
  # def _add_relationship(rel_type, node)
  # def update_nested_attributes
  # def accepts_nested_attributes_for

  rel = self._decl_rels[prop.to_sym]
  raise "No relationship declared with has_n or has_one with type #{prop}" unless rel

  if rel.has_one?
    setter = :"#{prop}="
    original_setter = :"#{prop}_without_accepting_hash="

    define_method :"#{prop}_with_accepting_hash=" do |attributes|

      node = if attributes.is_a? rel.target_class
               attributes
             elsif attributes.present?
               # not sure what would be to happen if a block were somehow to be given to the setter method
               if block_given?
                 yield(attributes)
               else
                 # todo: allow find_or_create
                 target_class.new attributes
               end
             else
               nil
             end

      send(original_setter, node)
    end

    alias_method_chain setter, :accepting_hash
  end

else
  # todo: has_n
end