cheerfulstoic

def die_roll
  rand(6) + 1
end

def attack(attacking_count, defending_count)
  attacking_dice = [attacking_count, 3].min
  defending_dice = [defending_count, 2].min

  attacking_rolls = attacking_dice.times.map { die_roll }.sort.reverse
  defending_rolls = defending_dice.times.map { die_roll }.sort.reverse

cheerfulstoic

Welcome to the first episode in a series of short screencasts for the Ruby neo4j gem. Each episode will describe a different aspect of the gem. In this first episode, we will start by discussing how to set up a new Ruby on Rails app using Neo4j. The neo4j gem is not Rails specific so you can use other frameworks like Sinatra or Lotus, but because of the popularity of Ruby on Rails we will be using it for this screencast series.

In this series we’re going to create an application to host digital assets which we’ll call "asset_portal". To create your Rails app you can run a rails new command as usual. To use Neo4j instead of ActiveRecord you can give arguments which will set up a new Rails app using Neo4j models.

rails new asset_portal -m http://neo4jrb.io/neo4j/neo4j.rb -O

The dash-m argument runs a script from the neo4j gem project and the dash-capital-O argument says to exclude ActiveRecord. There aren’t any restrictions on using Neo4j with other ORMs like ActiveRecord, but you will need to conf

cheerfulstoic

def trace_execution(levels = 4)
  cyan = "\e[36m"
  clear = "\e[0m"
  green = "\e[32m"

  indent = 0
  output = ''
  trace = TracePoint.new(:call, :c_call, :return, :c_return) do |tp|
    if [:return, :c_return].include?(tp.event) && indent.nonzero?

cheerfulstoic

# R setup
library(RNeo4j)

graph = startGraph("http://localhost:7474/db/data/")


# Queries:

# What types of objects are we dealing with?
MATCH (n)

cheerfulstoic

set -g mouse on

bind -n WheelUpPane if-shell -F -t = "#{mouse_any_flag}" "send-keys -M" "if -Ft= '#{pane_in_mode}' 'send-keys -M' 'select-pane -t=; copy-mode -e; send-keys -M'"
bind -n WheelDownPane select-pane -t= \; send-keys -M

bind-key -n S-Up resize-pane -U 5
bind-key -n S-Down resize-pane -D 5
bind-key -n S-Left resize-pane -L 5
bind-key -n S-Right resize-pane -R 5

cheerfulstoic

# ~/.tmuxinator/neo4jrb.yml

name: neo4jrb
root: ~/github/neo4jrb

# Optional tmux socket
# socket_name: foo

# Runs before everything. Use it to start daemons etc.
pre:

cheerfulstoic

Welcome to the second in a series of short screencasts for the Ruby neo4j gem. Today we’ll be discussing properties on ActiveNode models. Everything discussed here applies to ActiveRel models as well, but we’ll talk about ActiveRel in a later episode.

Nodes in Neo4j are much like documents in MongoDB. They can have any number of properties and those properties can be assigned values of different types.

In the neo4j gem we can define properties on an ActiveNode model class by calling the property method. Here we have an Asset model describing assets. Calling the property method with the property’s name as the only argument is sufficient to declare the property and to assign values to it.

property :title

asset.title = "Widget"
asset # =>

cheerfulstoic

Welcome to the sixth episode in a series of short screencasts about the Ruby neo4j gem. Previously we learned how to chain associations together to create queries which can hop across entities and use any part of the entire path to query records of interest. In this episode we dig deeper into the tools behind the magic. A familiarity with the Cypher query language is advised. See the show notes for a link to a Cypher tutorial.

As discussed previously, when we call associations we get a proxy object:

user.created_assets

There are two kinds of proxy objects: AssociationProxy and QueryProxy. The details aren't important for the moment, but behind the scenes both are causing a Query object to be built. We can see this Query object by calling the query method at any point:

user.created_assets.query

cheerfulstoic

rails g migration
What would you like to call your migration? > Something
Which of the following would you like to do:
 1 - create a table
 2 - add a column
 3 - remove a column
 # etc…
> 1
What would you like to call your table? somethings
Please give the first column for your table: name

cheerfulstoic

• server_db mode has been removed and should be replaced by either http or bolt