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Editorial Team
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Asked: 2026-05-23T11:45:02+00:00

I am trying to create a new User in a MongoDB/Sinatra Server from a

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I am trying to create a new “User” in a MongoDB/Sinatra Server from a Rails3 Client using ActiveResource and Json and the object body or hash that is sent is empty. In Rails3, I created a “User” model and using the Rails Console I make an ActiveResource call to the Sinatra Server. The Server correctly reads the URL, but no parameters seem to get passed with the object. Can someone please give me their thoughts as to what I have missed or why I am not getting the correct output?

Sinatra Server uses Ruby 1.8.7.
Rails3 Client uses Ruby 1.9.2.

From Rails3 Client User Model:

class User < ActiveResource::Base 
   self.site = "http://127.0.0.1:9393/"
   self.collection_name = "user/add"
   self.format = :json 
end

From the Rails3 console:

u=User.new(:first_name=>"Bill",:last_name=>"Smith")
=> #<User:0xa8d7fac @attributes={"first_name"=>"Bill", "last_name"=>"Smith"}, @prefix_options={}>
u.save
=> True

The Sinatra app server receives the following object (which I retrieve from the Sinatra server using “puts @app.inspect”):

 #<Api:0xb6ee4e70 @block_params=[], @result={"status"=>200, "error"=>nil}, @params={}, @observer_state=true, @request=#<Sinatra::Request:0xb6ee4e0c @params={}, @route="/user/add.json", @env={"HTTP_HOST"=>"127.0.0.1:9393", "HTTP_ACCEPT"=>"*/*", "SERVER_NAME"=>"127.0.0.1", "REQUEST_PATH"=>"/user/add.json", "rack.url_scheme"=>"http", "HTTP_USER_AGENT"=>"Ruby", "REMOTE_HOST"=>"localhost", "CONTENT_LENGTH"=>"50", "rack.errors"=>#<Rack::Lint::ErrorWrapper:0xb6ee5294 @error=#<IO:0xb77e955c>>, "SERVER_PROTOCOL"=>"HTTP/1.1", "CONTENT_TYPE"=>"application/json", "rack.version"=>[1, 1], "rack.run_once"=>false, "SERVER_SOFTWARE"=>"WEBrick/1.3.1 (Ruby/1.8.7/2011-02-18)", "REMOTE_ADDR"=>"127.0.0.1", "PATH_INFO"=>"/user/add.json", "SCRIPT_NAME"=>"", "HTTP_VERSION"=>"HTTP/1.1", "rack.multithread"=>true, "rack.multiprocess"=>false, "REQUEST_URI"=>"http://127.0.0.1:9393/user/add.json", "rack.request.query_hash"=>{}, "SERVER_PORT"=>"9393", "REQUEST_METHOD"=>"POST", "rack.request.query_string"=>"", "rack.input"=>#<Rack::Lint::InputWrapper:0xb6ee52d0 @input=#<StringIO:0xb76fbeb0>>, "HTTP_CONNECTION"=>"close", "QUERY_STRING"=>"", "GATEWAY_INTERFACE"=>"CGI/1.1"}>, @original_params={}, @template_cache=#<Tilt::Cache:0xb6ee4fb0 @cache={}>, @env={"HTTP_HOST"=>"127.0.0.1:9393", "HTTP_ACCEPT"=>"*/*", "SERVER_NAME"=>"127.0.0.1", "REQUEST_PATH"=>"/user/add.json", "rack.url_scheme"=>"http", "HTTP_USER_AGENT"=>"Ruby", "REMOTE_HOST"=>"localhost", "CONTENT_LENGTH"=>"50", "rack.errors"=>#<Rack::Lint::ErrorWrapper:0xb6ee5294 @error=#<IO:0xb77e955c>>, "SERVER_PROTOCOL"=>"HTTP/1.1", "CONTENT_TYPE"=>"application/json", "rack.version"=>[1, 1], "rack.run_once"=>false, "SERVER_SOFTWARE"=>"WEBrick/1.3.1 (Ruby/1.8.7/2011-02-18)", "REMOTE_ADDR"=>"127.0.0.1", "PATH_INFO"=>"/user/add.json", "SCRIPT_NAME"=>"", "HTTP_VERSION"=>"HTTP/1.1", "rack.multithread"=>true, "rack.multiprocess"=>false, "REQUEST_URI"=>"http://127.0.0.1:9393/user/add.json", "rack.request.query_hash"=>{}, "SERVER_PORT"=>"9393", "REQUEST_METHOD"=>"POST", "rack.request.query_string"=>"", "rack.input"=>#<Rack::Lint::InputWrapper:0xb6ee52d0 @input=#<StringIO:0xb76fbeb0>>, "HTTP_CONNECTION"=>"close", "QUERY_STRING"=>"", "GATEWAY_INTERFACE"=>"CGI/1.1"}, @app=nil, @observer_peers=[#<HookMongo:0xb6d714f8 @extra=nil, @app=#<Api:0xb6ee4e70 ...>>], @response=#<Sinatra::Response:0xb6edb94c @writer=#<Proc:0xb77cd4b0@/home/scott/.rvm/gems/ruby-1.8.7-p334@api/gems/rack-1.3.0/lib/rack/response.rb:28>, @block=nil, @chunked=false, @length=0, @header={"Content-Type"=>nil}, @body=[], @status=200>>

As you can see the @params={} is empty.

Using the HTTP request works:

Net::HTTP.post_form(URI.parse('http://127.0.0.1:9393/user/add.json'),{'first_name' => 'Smith', 'last_name' => 'Bill'})

And produces this:

#<Api:0xb6ee4fec @block_params=[], @result={"status"=>200, "error"=>nil}, @params={"last_name"=>"Bill", "first_name"=>"Smith"}, @observer_state=true, @request=#<Sinatra::Request:0xb6ee4f88 @params={"last_name"=>"Bill", "first_name"=>"Smith"}, @route="/user/add.json", @env={"HTTP_HOST"=>"127.0.0.1:9393", "HTTP_ACCEPT"=>"*/*", "SERVER_NAME"=>"127.0.0.1", "REQUEST_PATH"=>"/user/add.json", "rack.url_scheme"=>"http", "HTTP_USER_AGENT"=>"Ruby", "REMOTE_HOST"=>"localhost", "CONTENT_LENGTH"=>"31", "rack.errors"=>#<Rack::Lint::ErrorWrapper:0xb6ee5410 @error=#<IO:0xb77e955c>>, "SERVER_PROTOCOL"=>"HTTP/1.1", "CONTENT_TYPE"=>"application/x-www-form-urlencoded", "rack.version"=>[1, 1], "rack.run_once"=>false, "SERVER_SOFTWARE"=>"WEBrick/1.3.1 (Ruby/1.8.7/2011-02-18)", "REMOTE_ADDR"=>"127.0.0.1", "PATH_INFO"=>"/user/add.json", "SCRIPT_NAME"=>"", "HTTP_VERSION"=>"HTTP/1.1", "rack.multithread"=>true, "rack.request.form_vars"=>"first_name=Smith&last_name=Bill", "rack.multiprocess"=>false, "REQUEST_URI"=>"http://127.0.0.1:9393/user/add.json", "rack.request.form_input"=>#<Rack::Lint::InputWrapper:0xb6ee544c @input=#<StringIO:0xb76d72a4>>, "rack.request.query_hash"=>{}, "SERVER_PORT"=>"9393", "REQUEST_METHOD"=>"POST", "rack.request.form_hash"=>{"last_name"=>"Bill", "first_name"=>"Smith"}, "rack.request.query_string"=>"", "rack.input"=>#<Rack::Lint::InputWrapper:0xb6ee544c @input=#<StringIO:0xb76d72a4>>, "QUERY_STRING"=>"", "GATEWAY_INTERFACE"=>"CGI/1.1"}>, @original_params={"last_name"=>"Bill", "first_name"=>"Smith"}, @template_cache=#<Tilt::Cache:0xb6ee512c @cache={}>, @env={"HTTP_HOST"=>"127.0.0.1:9393", "HTTP_ACCEPT"=>"*/*", "SERVER_NAME"=>"127.0.0.1", "REQUEST_PATH"=>"/user/add.json", "rack.url_scheme"=>"http", "HTTP_USER_AGENT"=>"Ruby", "REMOTE_HOST"=>"localhost", "CONTENT_LENGTH"=>"31", "rack.errors"=>#<Rack::Lint::ErrorWrapper:0xb6ee5410 @error=#<IO:0xb77e955c>>, "SERVER_PROTOCOL"=>"HTTP/1.1", "CONTENT_TYPE"=>"application/x-www-form-urlencoded", "rack.version"=>[1, 1], "rack.run_once"=>false, "SERVER_SOFTWARE"=>"WEBrick/1.3.1 (Ruby/1.8.7/2011-02-18)", "REMOTE_ADDR"=>"127.0.0.1", "PATH_INFO"=>"/user/add.json", "SCRIPT_NAME"=>"", "HTTP_VERSION"=>"HTTP/1.1", "rack.multithread"=>true, "rack.request.form_vars"=>"first_name=Smith&last_name=Bill", "rack.multiprocess"=>false, "REQUEST_URI"=>"http://127.0.0.1:9393/user/add.json", "rack.request.form_input"=>#<Rack::Lint::InputWrapper:0xb6ee544c @input=#<StringIO:0xb76d72a4>>, "rack.request.query_hash"=>{}, "SERVER_PORT"=>"9393", "REQUEST_METHOD"=>"POST", "rack.request.form_hash"=>{"last_name"=>"Bill", "first_name"=>"Smith"}, "rack.request.query_string"=>"", "rack.input"=>#<Rack::Lint::InputWrapper:0xb6ee544c @input=#<StringIO:0xb76d72a4>>, "QUERY_STRING"=>"", "GATEWAY_INTERFACE"=>"CGI/1.1"}, @app=nil, @observer_peers=[#<HookMongo:0xb6d68c18 @extra=nil, @app=#<Api:0xb6ee4fec ...>>], @response=#<Sinatra::Response:0xb6edbac8 @writer=#<Proc:0xb77cd4b0@/home/scott/.rvm/gems/ruby-1.8.7-p334@api/gems/rack-1.3.0/lib/rack/response.rb:28>, @block=nil, @chunked=false, @length=0, @header={"Content-Type"=>nil}, @body=[], @status=200>>

@params={“last_name”=>”Bill”, “first_name”=>”Smith”} is no longer empty.

In the active_resource/connection.rb file, line 94

# Executes a POST request.
# Used to create new resources.
def post(path, body = '', headers = {})
  with_auth { request(:post, path, body.to_s, build_request_headers(headers, :post, self.site.merge(path))) }
end

I’m sure I’m missing something, but this seems to create a empty body.

Thanks for your advice in advance.

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1 Answer

  1. Editorial Team

    Sinatra doesn’t parse the body by default. If there is a form encoding header, Rack will parse the form encoded body and put it in the params which is why using post_form works. You need to pull the request body out and parse it yourself. e.g.

    post '/add' do
  user_hash = JSON.parse request.body
  User.create! user_hash
end
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