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I'm having some problems posting JSON data to my rails controller and getting the fields from my JSON data to map onto the paremeters to create my entity.

Here's what the action looks like:

def create @trip = Trip.new(params[:trip]) if @trip.save respond_to do |format| format.json{render :json => @trip, :status => :created, :location => @trip } end end end 

And here's the output from the web server:

Started POST "/trips.json" for 127.0.0.1 at Sat Sep 03 12:37:41 -0400 2011 Processing by TripsController#create as JSON Parameters: {"title"=>"Charlie"} AREL (0.5ms) INSERT INTO "trips" ("created_at", "updated_at", "title") VALUES ('2011-09-03 16:37:41.945743', '2011-09-03 16:37:41.945743', NULL) Completed 201 Created in 15ms (Views: 3.5ms | ActiveRecord: 0.5ms) 

As you can see it's inserting NULL into the title field, I was expecting it to map it on from the JSON data?

Here's the HTTP request:

Host localhost:3000 User-Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:6.0.1) Gecko/20100101 Firefox/6.0.1 Accept */* Accept-Language en-us,en;q=0.5 Accept-Encoding gzip, deflate Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection keep-alive Content-Type application/json; charset=UTF-8 X-Requested-With XMLHttpRequest Referer http://localhost:3000/trips/new Content-Length 19 Cookie _tripplanner_session=BAh7ByIQX2NzcmZfdG9rZW4iMWJCVDc0YWNIeHROcmw5VC9ZVEhMdFNlR0dtTWtSVytCL0dwTi9yam1CUUU9Ig9zZXNzaW9uX2lkIiU1NzhlMDAwNmM2N2RkMTE1YTA3M2ZmMzA4NDQ0M2NmOQ%3D%3D--1c2f1fc1d7c1bd147fa1cf9cff47e77c050f51be Pragma no-cache Cache-Control no-cache 

1 Answer 1

16

Your problem is that your controller is expecting parameters related to a trip to be in params[:trip].

Change your json to be

trip: { title: 'Charlie' } 

and I think that will fix it for you.

i.e. your params should look like params => {:trip => {:title => 'Charlie}}

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