In ruby on rails how to get data from client side(android)

Question

Android as a client side,i am sending data from client side to server side.Ruby on rails as server side,how to fetch data from client side using the post method.

I want to get the data from client side to server side to display. For client side i have code how to send data to server side,but in server i dont know how to fetch data.

By using server side only,we have to create url and that url ony we have to use in client side code for sending data.

serversidecode.

def load
    if signed_in?
      @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
      @my_post = current_user.posts.new
    end
    @posts = Post.paginate(page: params[:page],:per_page => 10)
    @post = Post.new
  end


  def index
    @posts = Post.all
    respond_with(@posts) do |format|
      format.json { render json: @post_names = {:post => @posts.as_json(:only=> :content)} }
    end
  end 

  def show
    if signed_in?
      @post = Post.find(params[:id])
      @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
      current_user.vote_for(@post)
    else
    @post = Post.find(params[:id])
    Guest.find(1).vote_for(@post)
    end
    @posts = Post.paginate(page: params[:page],:per_page => 10)  
    @guest = Guest.new
    @user = User.new
    @users = User.paginate(page: params[:page],:per_page => 10)
  end

  def create 
    @post = Post.new(params[:post])
    if @post.save
      @posts = Post.paginate(page: params[:page],:per_page => 10)
    else 
      @posts = Post.paginate(page: params[:page],:per_page => 10)
    end
    @guest = Guest.new
    @users = User.paginate(page: params[:page],:per_page => 10)

  end

  def my_prayer_create     
      @my_post = current_user.posts.new(params[:post])
      @post = Post.new(params[:post])
      @guest = Guest.new
      @user = User.new
      @users = User.paginate(page: params[:page],:per_page => 10)
      if @my_post.save
        flash[:notice] = "Prayer Successfully created."
        @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
      else 
        flash[:notice] = "Error"
        @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
      end
  end

  def edit
    if signed_in?    
    @my_post = current_user.posts.find(params[:id])
    else
    @post = Post.find(params[:id])
    end
  end

  def update
    if signed_in? 
      @my_post = current_user.posts.find(params[:id])
      if @my_post.update_attributes(params[:post])
        flash[:notice] = "Prayer Successfully updated."
        @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
      end
    else  
    @post = Post.find(params[:id])
    end
  end

  def destroy
    if signed_in? 
      @my_post = current_user.posts.find(params[:id])
      @users = User.paginate(page: params[:page],:per_page => 10)
      @guest = Guest.new
      @my_post.destroy
      flash[:notice] = "Prayer Successfully destroyed."
      @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
    end
  end

This is the server side,how to do here to fetch data from client side.

Myclientside code also i mention here

public class HomeLayoutActivity extends Activity implements OnClickListener{

        private EditText value;
        private Button btn;
        private ProgressBar pb;
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.home_layout);
            value=(EditText)findViewById(R.id.editText1);
            btn=(Button)findViewById(R.id.button1);
            pb=(ProgressBar)findViewById(R.id.progressBar1);
            pb.setVisibility(View.GONE);
            btn.setOnClickListener(this);
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            getMenuInflater().inflate(R.menu.home_layout, menu);
            return true;
        }

        public void onClick(View v) {
            // TODO Auto-generated method stub
                if(value.getText().toString().length()<1){

                    // out of range
                    Toast.makeText(this, "please enter something", Toast.LENGTH_LONG).show();
                }else{
                    pb.setVisibility(View.VISIBLE);
                    new MyAsyncTask().execute(value.getText().toString());      
                }


        } 

        private class MyAsyncTask extends AsyncTask<String, Integer, Double>{

            @Override
            protected Double doInBackground(String... params) {
                // TODO Auto-generated method stub
                postData(params[0]);
                return null;
            }

            protected void onPostExecute(Double result){
                pb.setVisibility(View.GONE);
                Toast.makeText(getApplicationContext(), "command sent", Toast.LENGTH_LONG).show();
            }
            protected void onProgressUpdate(Integer... progress){
                pb.setProgress(progress[0]);
            }

            public void postData(String valueIWantToSend) {
                // Create a new HttpClient and Post Header
                HttpClient httpclient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost("http://localhost:3000/posts/create_a_post");

                try {
                    // Add your data
                    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                    nameValuePairs.add(new BasicNameValuePair("content", valueIWantToSend));
                    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                    //httppost.addHeader("Authorization","Basic "+authorization);
                    httppost.addHeader("Content-Type","application/x-www-form-urlencoded");
                    //httppost.setHeader("Content-Type", "application/json");
                    httppost.addHeader("Accept", "application/json");

                    // Execute HTTP Post Request
                    HttpResponse response = httpclient.execute(httppost);

                } catch (ClientProtocolException e) {
                    // TODO Auto-generated catch block
                } catch (IOException e) {
                    // TODO Auto-generated catch block


                }
            }
        }
    }

How to get data from client side,what are the codes i have to do in ruby on rails

Answer 1

You don't send Json to the server.

See similar question how to send Json data with Android: How to send POST request in JSON using HTTPClient?

If your Json is correct you can access your data in Rails with the params method, there will no difference in accessing params between a normal web request or an android client request.

You don't need to change the Rails code. Make a test request with an Http-Client.

I made a screenshot for an example request with HttpRequester:

The params post[name] and post[user_id] only examples, replace it with your attributes.

Your development server console should have following output after sending the request:

Started POST "/posts" for 127.0.0.1 at 2013-06-10 13:31:01 +0200
Processing by PostsController#create as HTML
  Parameters: {"post"=>{"name"=>"name", "user_id"=>"5"}}