week_4_day_3_morning.rb

rake db:create #connects to psql to connect to the database; 

rails g migration create_artists #create an empty migration file; 

rails g migration create_artists name:string nationality:string #will write the table for you; 

#The filename and he class name in the migrations have to be the same, DONT MESS WITH THEM; 
#You do not need to mention ids when you create a table rails will automaticlly do this for you; 

rake db:migrate #This will run the most recent migration that it has not run for you; #You can check the schema.rb to check that the migration has been run; 

create_table :works do |t| #t is passing the table into the block which we can then use to create the table; 

#The name of the model has to be singular (also make sure you name the file singular); 

class Artist < ActiveRecord::Base #Active record will go and find the table for us
end

annotate #should tell us one gem has been annotated; 

#Go into the rails console and double check that you have a connection; 

#In the model add attr_accessible for all the things that you want to be able to mass assign; 

resources :artists #The will create all of the CRUD routes; 

rails g controller Artists 

strftime #string for time

artist.dob.

<%= link_to 'Delete artist', @artist, :method => :delete %>

#The point is that you can use the same URL with different verbs, the idea is that you do not need seprate URLS; Trying to prevent URL proliferation; 

#PATCH is a small update; 
#PUT is an update; 

artist_path(@artist)
@artist => /artist/7
artist
#All three of these will render the artist show action; 

edit_artist_path(@artist)

#parital a view that you use within another view; 
_form.html.erb #It is convention to use an underscore in front of the partial; 

<%= render :partial => 'form' %> #you do not need to use the underscore when you render the partial
<%= render 'form' %> #shorthand for the line above; 

#form_for will pre-populate the edit form by using the instance variable you created in the controller; 

#Edit artist is being sent as a patch, if you look in the form there is a hidden input with method patch; 

An artist has many works and each work belongs to an artist

#We need to add artist_id to the works table; 
rails g migration AddArtistIdToWork artist_id:integer

Work.all.first
Work.first #This is the most efficient, it is only going to get one result; 
Work.all[0] #This will be the slowest 

artist.work << work
work.artist = artist

artist.works.length
artist.works.first.title #Walking the graph; 

forger = Artist.new

##RESOURCES
api.rubyonrails.org