Find type of the request in controller

Is there any way to find the type of request in controller ?

 Yes.

What we do in routes.rb is , define the type of request to particular action .

But What If we want to find out the type of request in controller .

if request.get?
   logger.info "Request is GET"
elsif request.post?
   logger.info "Request is POST"
elsif request.xhr?
   logger.info "Request is AJAX"
end

Ajax Request in Ruby On Rails (UJS)

Many programmer uses jquery to catch click event and do $.get or $.post to access the server and print the response in a required div.

But there is a handy way to do ajax request using UJS provided by Rails .

Let us take an example of flipkart "add to wish list" event. So In flipkart.com when you click add to wish list , the item will be added in your wishlist .

This can be easily achieved in three easy steps.
Now lets see how to do that in rails using UJS

Step 1:
In view(show.haml.html) your may have

  
= link_to "Add to wishlist" , wish_list_path(@product) ,:id => "wish_list_link" 

Now we make it as ajax request by adding :remote => true

  
= link_to "Add to wishlist" , wish_list_path(@product) ,:id => "wish_list_link"  , 
:remote => true

Step 2:
Now in controller

    
    def wish_list
      #adding wish list 
      respond_to do |format|
         format.js #This line is important
       end
    end 
    

Step 3:
Now create a file named wish_list.js.erb

  
    $("#wish_list_link").html(''added to wishlist");
     # Lets say you want to render a partial .
    $("#wish_list_linkt").html('<%= escape_javascript(render :partial => "wish_list" , :locals => { :product => @product})%>');

Step 4(optional):
You can use jquery to show the loading part while server is responding

  
   $("#wish_list_link").live("click",function(){
        #show_loading_img
   })

...and that's it.