How to do a Post/Redirect/Get using Sinatra?
What's Sinatra's equivalent of Rails' redirect_to
method? I need to follow a Post/R开发者_开发百科edirect/Get flow for a form submission whilst preserving the instance variables that are passed to my view. The instance variables are lost when using the redirect
method.
Redirect in Sinatra is the most simple to use.
So the code below can explain:
require 'rubygems'
require 'sinatra'
get '/' do
redirect "http://example.com"
end
You can also redirect to another path in your current application like this, though this sample will delete a method.
delete '/delete_post' do
redirect '/list_posts'
end
A very common place where this redirect instruction is used is under Authentication
def authorize!
redirect '/login' unless authorized?
end
You can see more samples under:
Sinatra Manual
FAQ
Extensions
As for your second question, passing variables into views, it's possible like this:
get '/pizza/:id' do
# makeing lots of pizza
@foo = Foo.find(params[:id])
erb '%h1= @foo.name'
end
The Sinatra Book should clear your question. Especially the "Redirect" part.
Quoted from the book:
The redirect actually sends back a Location header to the browser, and the browser makes a followup request to the location indicated. Since the browser makes that followup request, you can redirect to any page, in your application, or another site entirely.
The flow of requests during a redirect is: Browser –> Server (redirect to ’/’) –> Browser (request ’/’) –> Server (result for ’/’)
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