Ruby Graph Sample Data Generator

graph.rb

require 'json'

class NodeConnectionGenerator
  attr_reader :node_count
  attr_accessor :nodes, :edges

  def initialize(node_count)
    @node_count = node_count
    @nodes = []
    @edges = []
  end

  def generate
    node_count.times do |n|
      nodes << new_nodes_element(n)

      next if n == 0 # Need other nodes to connect with first

      add_new_interconnected_edges(n)
    end
  end

  private

  def new_nodes_element(n)
    { data: { id: n.to_s } }
  end

  def add_new_interconnected_edges(n)
    edges << new_edges_element(n)

    n.times do |i|
      begin
        if n % i == 0
          edges << new_edges_element(n, (n - i))
        end
      rescue ZeroDivisionError
      end
    end
  end

  def new_edges_element(n, target = nil)
    source   =  n.to_s
    target ||=  (n - 1).to_s

    { data: { id: "#{source}#{target}", source: source, target: target } }
  end
end

generator = NodeConnectionGenerator.new(250)

generator.generate

File.open('nodes.json', 'w') { |file| file.puts generator.nodes.to_json }
File.open('edges.json', 'w') { |file| file.puts generator.edges.to_json }

With 1000 nodes and 7000 connections using cytoscape.js: