schema
post 'boards' => 'boards#create'
def create
board.rb validation
def index
app/views/boards/index.html.erb
get 'boards/:id' => 'boards#show'
def show
app/views/boards/show.html.erb
app/views/boards/index.html.erb
get 'boards/:id/edit' => 'boards#edit'
def edit
app/views/boards/edit.html.erb
app/views/boards/show.html.erb
put 'boards/:id' => 'boards#update'