Question

As mentioned on another similar thread I started recently, I am porting an ASP MVC application to Sinatra, partly for learning, partly for production purposes.

Currently my ASP MVC application has no views, it just exposes models as Xml/Json etc and accepts them in the same way. So in the scenario of someone sending a model to the server, it would auto bind the object, perform validation then return validation errors if there are any, if not carry on with the relevant actions.

Now in Sinatra it is a bit more barebones that ASP MVC which is a great thing as I have more choice on how to do these parts, however I dont have a clue what gems/libraries functionality is available for doing this.

My ideal scenario would be I have my pure html/js front end posting a model as json and then have it turned into an actual model where I can validate it (through Sinatra or other framework) then make a decision based on the validation results.

Answer 1

Try taking a look at this gem:

• json

Then what you should be able to do is pass in the attributes for an object you would like to create as a hash of attributes converted to a json object:

{:attribute1 => "value1", :attribute2 => "value2"}.to_json

And on your Sinatra app, catch them and build the object from those attributes, and you can use Sinatra to validate as well:

def '/create_object' do
  content_type :json
  obj = Object.new(JSON.parse(params[:object]))

  if obj.save
    obj.to_json
  else
    error 400, user.errors.to_json
  end
end