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Screencasting Framework

The following document is a written account of the Code School screencasting framework. It should be used as a reference of the accompanying screencast on the topic.

Why you should care about screencasting?

You're probably aren't going to take the time to read this document if you're not interested, but there are a lot of nice side effects caused by learning how to create quality screencasts.

1. Communicating more effectively - At Envy Labs we produce screencasts for our clients all the time. Whether it's demoing a new feature or for a presentation for an invester, they're often much more effective and pleasent than a phone call or screen sharing.

pazaricha

#Deploy and rollback on Heroku in staging and production
task :deploy_staging => ['deploy:set_staging_app', 'deploy:push_staging', 'deploy:restart', 'deploy:tag']
task :deploy_production => ['deploy:set_production_app', 'deploy:push_production', 'deploy:restart', 'deploy:tag']

namespace :deploy do
  PRODUCTION_APP = 'YOUR_PRODUCTION_APP_NAME_ON_HEROKU'
  STAGING_APP = 'YOUR_STAGING_APP_NAME_ON_HEROKU'

  task :staging_migrations => [:set_staging_app, :push_staging, :off, :migrate, :restart, :on, :tag]
  task :staging_rollback => [:set_staging_app, :off, :push_previous, :restart, :on]

pazaricha

# routes.rb (very bottom route):

match '*path' => SlugRackApp


# slug_rack_app.rb

class SlugRackApp
  def self.call(env)
    path = env["action_dispatch.request.path_parameters"][:path]

pazaricha

class FlightManager
  def self.search(search_criteria)
    provider = search_criteria[:provider].camelize
    flights = "FlightProviders::#{provider}".constantize.search_flights(search_criteria)
    "FilghtsResponseAdapter::#{provider}".constantize.normazlize(flights)
  end
end

## Have one of these for each unique provider/response
module FilghtsResponseAdapter

pazaricha

-- show running queries (pre 9.2)
SELECT procpid, age(query_start, clock_timestamp()), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(query_start, clock_timestamp()), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

pazaricha

# post_loc.txt contains the json you want to post
# -p means to POST it
# -H adds an Auth header (could be Basic or Token)
# -T sets the Content-Type
# -c is concurrent clients
# -n is the number of requests to run in the test

ab -p post_loc.txt -T application/json -H 'Authorization: Token abcd1234' -c 10 -n 2000 http://example.com/api/v1/locations/

pazaricha

defmodule Map.Helpers do
  @moduledoc """
  Functions to transform maps
  """

  @doc """
  Convert map string camelCase keys to underscore_keys
  """
  def underscore_keys(nil), do: nil