dohoonk

RUBY and SINATRA review

Difference between module and class

What protocol stack powers the web?

What is REST?

what protocol does it depend on?

When to use POST and GET

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bin/rails g migration add_indicies_to_questions

bin/rake db:migrate

bin/rails c

validates :title, presence: true

q.erros

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bin/rails c "question".pluralize

bin/rails generate questions

make sure you can access the page

get "/questions/new" => "questions#new", as: :new_questions

dohoonk

1.rails new amazon -t create project in rails

2.bin/rake db:create create database

3.bin/rails generate model product name:string description:text 'price:decimal{10,2}' this generates modle

4.bin/rake db:migrate

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1.get "/questions/:id" => "questions#show", as: :question

2.create control method def show @question = Question.find params[:id] end

3.create view page

dohoonk

#TDD

refactoring code

before_action :find_question, only:[:show, :edit, :update, :destroy] before_action :find_question, except:[:new, :create, index]

this will call find_question action before all the other action

def before_action

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  describe "#show" do
    it "finds the object by its id and sets to to @campaign variable" do
      # GIVEN:
      campaign = Campaign.create({name: "valid name",
                                  description: "valid description",
                                  goal: 100000})
      # WHEN:
      get :show, id: campaign.id

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ERD

One to Many

foreign key needs index contraint

bin/rails g model answer body:text question:references

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One to many

In the seed file ["Art, "Science", "Cats", "Sports", "Technology"].each do |cat| Category.create(name: cat) end

When trying to add category id

bin/rails g migration add_category_references_to_questions category:references

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#different users

make a relationship between user and the question

we need to add references

rails bin g migration add_user_references_to_questions user:references

bin/rake db:migrate