laurenhavertz/railsapp.md

## railsapp.md

      
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              railsapp.md
            
          
    Things to consider


what do you want to build?
what do you want your project to have? ie. do you want your app to save data? are you using an APi?


Create a visual model and relationships between them
Create views (what pages do you want to see? what do they contain?)
In the terminal rails new rtodo
Move into new "Rtodo" folder cd rtodo
open directory in sublime subl .
Create User model rails g model user MAKE SURE THIS IS SINGULAR
create List model  rails g model list
create Item model rails g model item
navigate to the MODEL folder
open user.rb


what are the attributes of the model user?

name
email
attr_accessible :name, :email
what are the relationships?

has_many :lists


Look at the migration file that was created for the USER


find in DB/migrate...create_users.rb


Tell the migration the attributes that we want to save
each entry gets a type


t.string :name
t.string :email


go back to App/Models/List


What are the attributes of the list?
attr_accessible :name, :description
What are the relationships?

LIST belongs_to :user
LIST has_and_belongs_to_many :items


Go to the migration file DB/migrate...._create_lists.rb


t.string :name
t.string :description
t.integer :user_id **make this part of the migration file. Each list will belong to a specific user. Because we specify in the model that LIST belongs to USER we don't need to add.


go to Model/Item
*create the accessible attributes

attr_accessible :name


create the relationships

has_and_belongs_to_many :lists **the item may belong to many lists and the lists will have many items. by building this relationship you create the realtionships


In DB/migrate...create_item.rb


t.string :name


IN THE TERMINAL rake db:migrate
create the join table rails g migration create_lists_items_table
go to DB/migrate => erase def up && def down
create a new change method in the new join table
def change
create_table :items_lists, :id => false do |t|
t.integer :list_id
t.integer :item_id
end
end
rake db:migrate
VERIFY THE MODELS


In the terminal rails c
User.all Item.all List.all they should all return => []
u = User.new Now we have a new user
u.name = "ryan" It should return `=> "ryan"
u.email = "ryan@abc.com" => ryan@abc.com
u checks the state of the object
u.save will show you what it did in the database (translate data into SQL) upon creation the database will create a userID
quit
rails c
user.all => should return all of the user data previously created
l = List.new
l.name = "shopping"
l.description = "my shopping list"
l
u = User.first
u.list
u.lists << l adding the list to the user


TIME TO SEED THE DATABASE


go to DB/migrate/seeds.rb
     User.delete_all
     List.delete_all
     Item.delete_all
     
     u = User.create(:name => 'Ryan', :email => 'ryan@abc.com')
     
     l1 = List.create(:name => 'shopping', :description => 'my shopping list')
     l2 = List.create(:name => 'house', :description => 'house chores')
     
     i1 = Item.create(:name => 'get milk')
     i2 = Item.create(:name => 'get beer')
     
     u.lists << l1
     u.lists << l2
     
     l1.items << i1
     l1.items << i2


Add validations to our models


In the user model validates_presence_of: email, name checks to make sure that your data is correct


also, validates_uniqueness_of: email checks to make sure you can't use the same email twice


In the list model validate_presence_of: name


In the item model validates_presence_of: name