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defmodule Util do
  defmacro __using__(_) do
    quote do
      require Util
      # Should it be imported?
      # import Util
    end
  end

  defmacro blank?(x) when is_binary(x) do

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Example inputs:

Variable	Value
key	the shared secret key here
message	the message to hash here

Reference outputs for example inputs above:

| Type | Hash |

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#!/usr/bin/env ruby

# Evaluates a sample of keys/values from each redis database, computing statistics for each key pattern:
#   keys: number of keys matching the given pattern
#   size: approximation of the associated memory occupied (based on size/length of value)
#   percent: the proportion of this 'size' relative to the sample's total
#
# Copyright Weplay, Inc. 2010. Available for use under the MIT license.

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# Redis Cheatsheet
# All the commands you need to know


redis-server /path/redis.conf  # start redis with the related configuration file
redis-cli                      # opens a redis prompt


# Strings.

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Best solution:

http://stackoverflow.com/a/808776/1180523

# model
validates   :email,    :uniqueness => { message: "is wrong" }
validates   :name,    :uniqueness => { message: "Your name is wrong" }

HUMANIZED_ATTRIBUTES = {
  :email => "E-mail address",
  :name => "" # don't include column name in error

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Rails.redis.get(key) 
Rails.redis.set(key, value) 
Rails.redis.expire(key, 1.hour) 
Rails.redis.del(key) 

 
Rails.redis.sadd(set_name, value) 
Rails.redis.srem(set_name, key) 
Rails.redis.sismember(set_name, value) # boolean test to see if val exists 

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defmodule MyBlog.Repo.Migrations.CreatePost do
  use Ecto.Migration

  def change do
    create table(:posts, primary_key: false) do
      add :id, :uuid, primary_key: true
      add :body, :string
      add :word_count, :integer

      timestamps

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Setting up a new Git Repo

##Create a new repository on the command line

touch README.md
git init
git add README.md
git commit -m "first commit"

git remote add origin git@github.com:alexpchin/.git

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# Using the `--exlude-table-data` argument for the `heroku pg:pull` command doesn't seem to be working.
# Instead we're going to copy the Heroku PG database by using the Postgres `pg_dump` and `pg_restore` commands.

# Get the "Connection info string" for myapp
heroku pg:credentials:url DATABASE_URL -a myapp

# Download the database, excluding the `visits` and `ahoy_events` table data.
pg_dump "<PASTE_CONNECTION_INFO_STRING_HERE>" --exclude-table-data visits --exclude-table-data ahoy_events -O -x -Fc -f without_vists_and_ahoy_events.out -v

# In myapp, setup an empty database

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Grab new backup of database

Command: heroku pgbackups:capture --remote production

Response: >>> HEROKU_POSTGRESQL_COLOR_URL (DATABASE_URL) ----backup---> a712

Get url of backup download

Command: heroku pgbackups:url [db_key] --remote production