notes

cinco_estrellas
IMPORTANT KEEP MODEL name singular
Setup
rails generate scaffold Customer name:string address:string city:string state:string zip:string country:string phone:string email:string
rails generate scaffold Package tracking:string customer_id:integer weight:decimal value:decimal sender_name:string sender_address:string sender_city:string sender_state:string sender_country:string sender_phone:string sender_email:string
rails generate scaffold Packagedetail tracking:string length:integer width:integer height:integer piece_weight:decimal package_id:int
rails generate scaffold Tracking package_id:string times:timestamp trackcode_id:integer
rails generate scaffold Trackcode description:string
rails generate scaffold Manifest origin:string destination:string notes:string total_wei
ght:decimal 
rails generate model Manifestdetail manifest_id:int tracking:string

rake db:migrate

Migrations
AddXXXToYYY
RemoveXXXFromYYY
rails generate migration AddPackageIdToPackagedetails package_id:int
rails generate migration RemovePakcageIdFromPackage package_id:int
Models          has_many :to_class_plural       belongs_to :to_class_singular
Customer        has_many :packages, dependent: :destroy

Package         belongs_to :customer
                has_many :trackings, dependent: :destroy
                has_many :packagedetails, dependent: :destroy

Tracking        belongs_to :package
PackageDetail   belongs_to :package


DB
To access DB
sqlite3 db/development.sqlite3
or use rails console: example Package.all

GEMS
For active admin demo page railscasts.com/episodes/284-active-admin
gem 'activeadmin', github: 'gregbell/active_admin'
gem 'devise'
gem 'country-select'

bundle
rails generate active_admin:install
rails generate active_admin:resource (NAME OF RESOURCE)
rails g active_admin:resource customer
rails g active_admin:resource package

REMOVING MODELS
bundle exec rake db:rollback
rails destroy model ModelName

Joining tables
Manifest.select("*").joins(:manifestdetail)
Queries
	Finding Manifest details
	select a manifest  		m = Manifest.first
	then query for details		Manifestdetail.where(manifest_id: m.id) 	
	
	NOTE: It seems that doing the above query Manifestdetail.find_by( manifest_id: m.id )
	is better because the returned object actually reflects the model better than with where.	
	for example this error code is shown when we searched using where
	undefined method `customer' for #<Package::ActiveRecord_Relation:0x00000002a8d278>
	
	31:                         p = Package.find_by( tracking: d.tracking )
    32:                         c = p.customer
    			The above worked but the bottom did not
    
    33:                         p = Package.where( tracking: d.tracking )
    34:                         c = p.customer

Active Admin Notes
Some setup you must do manually if you haven't yet:

  1. Ensure you have defined default url options in your environments files. Here
     is an example of default_url_options appropriate for a development environment
     in config/environments/development.rb:

       config.action_mailer.default_url_options = { host: 'localhost:3000' }

     In production, :host should be set to the actual host of your application.

  2. Ensure you have defined root_url to *something* in your config/routes.rb.
     For example:

       root to: "home#index"

  3. Ensure you have flash messages in app/views/layouts/application.html.erb.
     For example:

       <p class="notice"><%= notice %></p>
       <p class="alert"><%= alert %></p>

  4. If you are deploying on Heroku with Rails 3.2 only, you may want to set:

       config.assets.initialize_on_precompile = false

     On config/application.rb forcing your application to not access the DB
     or load models when precompiling your assets.

  5. You can copy Devise views (for customization) to your app by running:

       rails g devise:views