link_to vs. button_to

link_to  sends a GET request
button_to  sends a POST request

View your Gems and its methods locally with no internet

In this example I am viewing my Devise Gem.
(Your paths will be different than mine.)

$ gem which devise
==> /home/vagrant/.rvm/gems/ruby-2.3.0/gems/devise-4.2.0/lib/devise.rb

$ gem open devise

$ cd /home/vagrant/.rvm/gems/ruby-2.3.0/gems/devise-4.2.0/lib

$  ls

==> devise  devise.rb  generators

$ cd devise/

$ ls

==> controllers     hooks       models.rb    orm                     rails.rb         time_inflector.rb

delegator.rb    mailers     modules.rb   parameter_filter.rb     strategies       token_generator.rb

encryptor.rb    mapping.rb  omniauth     parameter_sanitizer.rb  test             version.rb

failure_app.rb  models      omniauth.rb  rails                   test_helpers.rb

$ cd controllers/

$ ls

==> helpers.rb  rememberable.rb  scoped_views.rb  sign_in_out.rb  store_location.rb  url_helpers.rb

$ cd ..

Here I am looking for the RegistrationsController in all the files with Grep. This is like when you are in Sublime and search all the files.

$ grep -r RegistrationsC .

==> ./rails/routes.rb:    #    class RegistrationsController < Devise::RegistrationsController

./parameter_sanitizer.rb:  # +password_confirmation+ for the `RegistrationsController`), and you can

./parameter_sanitizer.rb:    #    # Inside the `RegistrationsController#create` action.

$ cd rails/

$ ls

==> routes.rb  warden_compat.rb

This is where it is. I open it in vim and look around.

$ vim routes.rb 

git add with sophictication

I found this git command that I have been looking for forever.
I used to use it then I forgot it and have been googling for it ever since/.

The perfect pairing to git add -p, drum roll please...

git add . -N && git add -p

• The -N flag means is short for --intent-to-add 
• git add . -N will stage an empty file representing your newly added file.
  When git add --patch is called 
• Git will do the normal patch procedure over your newly created file's changes.
• If no changes are patched in,
  the empty file will not be included in your commit.

Always be sure to check your status!

https://coderwall.com/p/l99kbw/git-with-intent-to-add

Rails Cheat Sheet: Create Models, Tables and Migrations

Create a new table in Rails

rails g model Supplier name:string
rails g model Product name:string:index sku:string{10}:uniq count:integer description:text supplier:references popularity:float 'price:decimal{10,2}' available:boolean availableSince:datetime image:binary

Resulting migrations:

class CreateSuppliers < ActiveRecord::Migration
  def change
    create_table :suppliers do |t|
      t.string :name

      t.timestamps null: false
    end
  end
end

---

class CreateProducts < ActiveRecord::Migration
  def change
    create_table :products do |t|
      t.string :name
      t.string :sku, limit: 10
      t.integer :count
      t.text :description
      t.references :supplier, index: true, foreign_key: true
      t.float :popularity
      t.decimal :price, precision: 10, scale: 2
      t.boolean :available
      t.datetime :availableSince
      t.binary :image

      t.timestamps null: false
    end
    add_index :products, :name
    add_index :products, :sku, unique: true
  end
end

Rails migration to add a column

rails g migration AddKeywordsSizeToProduct keywords:string size:string

Resulting migration:

class AddKeywordsSizeToProduct < ActiveRecord::Migration
  def change
    add_column :products, :keywords, :string
    add_column :products, :size, :string
  end
end

Rails migration to remove a column

rails g migration RemoveKeywordsFromProduct keywords

Resulting migration:

class RemoveKeywordsFromProduct < ActiveRecord::Migration
  def change
    remove_column :products, :keywords, :string
  end
end

Rails migration to rename a column

rails g migration RenameProductPopularityToRanking

You need to add the rename_column command manually to the resulting migration:

class RenameProductPopularityToRanking < ActiveRecord::Migration
  def change
    rename_column :products, :popularity, :ranking
  end
end

Rails migration to change a column type

rails g migration ChangeProductPopularity

You need to add the change_column command manually to the resulting migration:

class ChangeProductPopularity < ActiveRecord::Migration
  def change
      change_column :products, :ranking, :decimal, precision: 10, scale: 2
  end
end

Running migrations

rake db:migrate

In production:

rake db:migrate RAILS_ENV="production" 

Notes on Redis

https://github.com/LARailsLearners/sarcastic_messages_tutorial/blob/master/redis_notes.md#cache-vs-data

Squashing a commit

• You just sent a pull request to GitHub.
• Someone commented on it.
• You fixed the errors. You added them, commited them and pushed them again. 

This actually adds another commit to that pull request and makes it really hard to read for the person who is trying to accept that commit.

What you can do to combine these commits into one, easy to read commit is to squash them together.

This is officially called squashing a commit.

https://github.com/ginatrapani/todo.txt-android/wiki/Squash-All-Commits-Related-to-a-Single-Issue-into-a-Single-Commit

Squash a commit:
$ git rebase -i HEAD~3

You'll see your commits all mashed together

pick Add to README
pick Add .gitignore
pick Edit README

and a list of options

what you want to do is Put the commit you want at the top and squash the other ones into it by removing the work pick in front of it and replacing that with the letter 's' for squash.

So it looks like this

pick Add to README
s Add .gitignore
s Edit README

save it and force push it to GitHub like this:

$ git push origin branch-name --force

Then instead of doing the whole thing again if you make another change just

git add  

git commit --amend

git push origin branch-name --force

and you can add to you former commit

Group Asset deprecated in Rails 4

There is no longer any reason to declare group :asset endin your Gemfile because it was deprecated in Rails 4.

Do not use this:

group :asset do
  gem 'whatever'
end

http://stackoverflow.com/questions/16406204/why-did-rails4-drop-support-for-assets-group-in-the-gemfile

Previously the assets group existed to avoid unintended compilation-on-demand in production. As Rails 4 doesn't behave like that anymore, it made sense to remove the asset group.
This is explained in more detail in the commit that changed that. I extracted some quotes with the actual answer.
Some gems can be needed (in production) like coffee-rails if you are using coffee templates and the fact that now assets are not precompiled on demand in production anymore.
(not precompiled on demand in production) Means that if you have that gems in production environment in 3.2.x and forget to precompile, Rails will do exactly what it does in development, precompile the assets that was requested. This is not true anymore in Rails 4, so if you don't precompile the assets using the tasks you will get a 404 when the assets are requests.

Rails 4 - Disable Turbo Links

Turbolinks is included in Rails 4. It is meant to implement fast reloading by only reloading changed to your app but I am okay with disabling Turbo links. It messes up a lot of the functionality with gems. (https://plus.google.com/+YehudaKatz/posts/A65agXRynUn)

If you need to refresh your page to see your gem them try disabling turbo links and it probably will be better.

I am trying to use the jQuery date picker. What a pain. There are some really lame, inline work arounds to disable turbo links on a per-line basis but I am just going to see what happens if I disable the entire gem.

So I decided to try the Bootstrap datepicker but then I realized that I am using Skeleton so why would I include all of Bootstrap for that one function. Plus it is no easier.

Back to jQuery UI's date picker

http://guides.rubyonrails.org/working_with_javascript_in_rails.html#turbolinks

How Turbolinks Works 

Turbolinks attaches a click handler to all <a> on the page. If your browser supports PushState, Turbolinks will make an Ajax request for the page, parse the response, and replace the entire <body> of the page with the <body> of the response. It will then use PushState to change the URL to the correct one, preserving refresh semantics and giving you pretty URLs.
The only thing you have to do to enable Turbolinks is have it in your Gemfile, and put //= require turbolinks in your CoffeeScript manifest, which is usually app/assets/javascripts/application.js.

If you want to disable Turbolinks for certain links, add a data-no-turbolink attribute to the tag:
<a href="..." data-no-turbolink>No turbolinks here</a>.

Disable Turbolinks
Turbolinks takes over any local link, sends an AJAX request for the content, and replaces the body on your current page with that content.
In your Gemfile remove: 

gem 'turbolinks' 

Run bundle

In your application.js remove:

//= require turbolinks

In your application.html.erb remove:

  <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %>

  <%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>

Delete any “data-turbolinks-track” attributes in your your other layouts.

Heroku Reset Database

WARNING: This action will delete your database and it's contents but if that is what you want to do proceed with caution and fully warned.

To reset your database:

(The name of my database is jobby-job - change that to the name of yours.)
heroku pg:reset DATABASE_URL

Then it will ask you:

 !    WARNING: Destructive Action
 !    This command will affect the app: jobby-job
 !    To proceed, type "jobby-job" or re-run this command with --confirm jobby-job

> jobby-job

Resetting DATABASE_URL... done

Then run  $ heroku pg:reset DATABASE_URL --confirm jobby-job

Fixtures - Mintest

ActiveRecord FixtureSet

rubyonrails.org/testing

---

funclub/test/fixtures/exercises.yml

arms:   name: windmills   sets: 3   reps: 10   notes: They are fun but be careful not to go too fast and hurt your shoulders.   bodypart: arms   workout_id: 1 core:   name: situps   sets: 4   reps: 25   notes: A classic stength builder for a beach body.   bodypart: Abs   workout_id: 2

To run the tests:
$ bin/rake test test/models/article_test.rb

Rollovers with Rails & Sprites

http://alistapart.com/article/sprites

Rails 4 Migrations

http://stackoverflow.com/questions/22815009/add-a-reference-column-migration-in-rails-4

When you already have a users and uploads table and wish to add new relationship between them.

All you need to do is, just generate a migration using following command:rails g migration AddUserToUploads user:references

which will create a migration file as:

class AddUserToUploads < ActiveRecord::Migration

  def change 

    add_reference :uploads, :user, index: true 

  end 

end

Then run the migration using rake db:migrate. This migration will take care of adding a new column named user_id to uploads table (referencing id column in users table) PLUS it will also add an index on the new column.

CSS was not working on Heroku

Add CSS to Heroku
To load the css and assets I ran:

$ bundle exec rake assets:precompile

That still didn't work so I ran:

$ RAILS_ENV=production bundle exec rake assets:precompile

The response:

rake aborted!  
Devise.secret_key was not set. Please add the following to your Devise initializer:
config.secret_key = (gave me a long number)

---

It is still not working 12-19-2015 on Linux but it works on Mac

(skeleton works on both)

Installing Postgres on Ubuntu

Heroku uses Postgres for their database so it is quite nice to use it as the database for your Rails app. That way there is a seamless transition.

Postgres Command Cheat sheet

This site is helpful if you are a Mac user and can $ `brew install`:
http://www.jackiejohnston.us/blog/setting-up-user-authentication-with-devise/

https://www.codefellows.org/blog/three-battle-tested-ways-to-install-postgresql

http://postgresapp.com/documentation/configuration-ruby.html

---

I decided to install Postgres it my Ubuntu ThinkPad.


How To Install and Use PostgreSQL on Ubuntu 14.04  https://www.digitalocean.com/community/tutorials/how-to-install-and-use-postgresql-on-ubuntu-14-04

Digital Ocean has great documentation.

sudo apt-get update
sudo apt-get install postgresql postgresql-contrib

---

How To Setup Ruby on Rails with Postgres  https://www.digitalocean.com/community/tutorials/how-to-setup-ruby-on-rails-with-postgres