How Sinatra works

Sinatra is a ruby gem application that allow you to build web site quickly. The method it uses is named after http request method like (get, post or put).

It also uses a templating language like ERB. HTML and Ruby can be integrated inside these templating language pages.


1. The last line in the block is return to the browser:

get '/' do
    erb :layout
end

This will return the erb file to the browser.

2. <%= @value %>
This will print out the value of @value.


3. For the value of params ,as far as I know, can be added like this

a. index.html/?key=name
- this will create params[:key] = name

b.
get "/:name" ; end
index.html/michael
- this will create params[:name]  = "michael"

c.
inside a form

<input name="list_name" placeholder="List Name" type="text" value="">

- this will create params[:list_name] = value

4. Instance Var define in other block is inaccessible by other block
eg :
get '/' do
   @value = 1
end

get '/hello' do
   @value    #=> return nil.
end

But is accessible via a 'before' block
before do
   @value = 10
end

get '/' do
   @value   # returns 10
end