From: Trans <transfire@...>
Date: 2009-01-24T06:12:02+09:00
Subject: Re: Desktop <-> Web



On Jan 20, 10:05 am, Brian Candler <b.cand...@pobox.com> wrote:
> That simplifies things a bit. Here it is for completeness:
>
> --- myapp.rb ---
> require 'rubygems'
> require 'sinatra'
> require 'json'
> require 'widget'
>
> get '/widgets.json' do
>   Widget.all.to_json
> end
>
> get '/widgets/:id.json' do
>   Widget.find(Integer(params[:id])).to_json
> end
>
> post '/widgets.json' do
>   item = JSON.parse(request.body.read)
>   Widget.create(item).to_s
> end
>
> --- widget.rb ---
> # Rubbish model, not thread-safe!
> class Widget
>   attr_accessor :id, :name, :price
>   def initialize(params)
>     @id    = params["id"]
>     @name  = params["name"]
>     @price = params["price"]
>   end
>   def to_json(*a)
>     instance_variables.inject({}) { |h,v|
>       h[v.to_s[1..-1]] = instance_variable_get(v)
>       h
>     }.to_json(*a)
>   end
>
>   @all = []
>   @seq = 0
>   def self.all
>     @all
>   end
>   def self.add(item)
>     item.id = (@seq += 1)
>     all << item
>     return @seq
>   end
>   def self.create(params)
>     add(new(params))
>   end
>   def self.find(id)
>     all.find { |item| item.id == id }
>   end
> end
> Widget.create("name" => "flurble", "price" => 12.3)
> Widget.create("name" => "boing", "price" => 4.56)
>
> If you require 'json/add/rails' then you don't need to define your own
> to_json method, but it also allows people to create arbitrary Ruby
> objects on your machine (which makes me uncomfortable)

Thanks. I'll give it a go.

T.