Rails%203%20In%20Action

Mounting a Rack application with Rails
params method by redefining the params method as a private method in your app.
Underneath the get you’ll put this:
def params
hash = env["action_dispatch.request.path_parameters"].merge!(super)
HashWithIndifferentAccess.new(hash)
end
By calling the super method here, you’ll reference the params method in the superclass,
Sinatra::Base. You want to access the keys in this hash using either symbols or
strings like you can do in your Rails application, so you create a new HashWith-
IndifferentAccess object, which is returned by this method. This lets you access
your token with either params[:token] or params["token"]. This hash is quite indifferent
to its access methods.
Let’s switch your root route back to calling p params. When you run your test
again, you should see that you finally have both parameters inside the one hash:
{:project_id=>"3", "token"=>"ZVSREe1aQjNZ2SrB9e8I"}
With these parameters you’ll now be able to find the user based on their token, get a
list of projects they have access to, and then attempt to find the project with the id
specified. You can do this by putting two calls, a find_user and find_project
method, in the before block you already have, using this code:
before do
headers "Content-Type" => "text/json"
find_user
find_project
end
The find_user and find_project methods can be defined underneath the private
keyword using this code:
private
def find_user
@user = User.find_by_authentication_token(params[:token])
end
def find_project
@project = Project.for(@user).find(params[:project_id])
end
This code should look fairly familiar: it’s basically identical to the code found in the
Api::V1::TicketsController and Api::V1::BaseController classes inside your
Rack application. First you find the user based on their token and then generate a
scope for all projects that the user is able to view with the Project.for method. With
this scope, you can then find the project matching the id passed in through
params[:project_id]. You are referencing the models from your Rails application
inside your Sinatra application, and there’s nothing special you have to configure to
allow this.
531