为什么 ActiveResource Post 不发送任何参数？

Question

我正在尝试使用 ActiveResource 和 Json 从 Rails3 客户端在 MongoDB/Sinatra 服务器中创建一个新的“用户”，并且发送的对象正文或哈希为空。在 Rails3 中，我创建了一个“用户”模型，并使用 Rails 控制台对 Sinatra 服务器进行了 ActiveResource 调用。服务器正确读取 URL，但似乎没有参数与对象一起传递。有人可以就我错过了什么或为什么我没有得到正确的输出给我他们的想法吗？

Sinatra 服务器使用 Ruby 1.8.7。
Rails3 客户端使用 Ruby 1.9.2。

来自 Rails3 客户端用户模型：

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

从 Rails3 控制台：

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

Sinatra 应用服务器接收以下对象（我使用“puts @app.inspect”从 Sinatra 服务器检索）：

 #<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>>

如您所见，@params={} 为空。

使用 HTTP 请求有效：

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

并产生这个：

#<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"} 不再为空。

在 active_resource/connection.rb 文件中，第 94 行

# 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

我确定我遗漏了一些东西，但这似乎创造了一个空的身体。

提前感谢您的建议。

Answer 1

默认情况下，Sinatra 不解析正文。如果有表单编码标头，Rack 将解析表单编码主体并将其放入参数中，这就是使用post_form 的原因。您需要将请求正文拉出并自己解析。例如

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