bp ultrasimple social graph (wip)

node.rb

# the "abstract" node
class BPGraph::Node

  # initialize an instance with id of the correct subclass from a node_key
  def self.load(node_key)

  end

  def initialize(node_id)
    @node_class ||= :node
    @node_id = node_id      
  end

  # generates e.g. "bpgraph_dev:user_node:436923"
  def redis_key(*append)
    [BPGraph.redis_prefix, node_key, append].flatten.join(":")
  end

  # generates e.g. "user_node:436923"
  def node_key
    [@node_class, @node_id].join(":")
  end

  # simple key/value store - we use it to save profile-picture url and first/
  # lastname from facebook without creating a model and record in mysql
  def prop_get(key)
    BPGraph.redis.hget(redis_key(:props), key)
  end

  # simple key/value store - create or overwrite a key with value
  def prop_store!(key, value)
    BPGraph.redis.hset(redis_key(:props), key, value)
  end

private

  # find all connected node_ids by edge_type (:donor, :visitor, :friend...)
  def find_edges(edge_type)
    BPGraph.redis.smembers(redis_key(:edge, edge_type))
  end

  # find all connected nodes as objects by edge_type (UserNode, ProjectNode...)
  def find_edges!(edge_type)
    find_edges(edge_type).map{ |node_key| self.class.load(node_key) }
  end

  # store a new connection to another node with edge_type (:donor, :friend...)
  def store_edge!(edge_type, node)
    BPGraph.redis.sadd(redis_key(:edge, edge_type), node.node_key)
  end

end