Rails JSON request is not parsed correctly into post parameters

Question

I\'m trying to debug a problem where Rails isn\'t decoding the JSON POST data.

The server logs show:

2011-12-14T06:44:44+00:00 app[web.2]: Started POST 
         


        

Answer 1

You can get past this by setting the Content-Type header to "application/json". You can let the controller know what it expects to return with the Accept header set to "application/json".

The following command with both headers:

curl -d '{ "company": { "name": "acme", "address": "123 Carrot Street" } }' http://0.0.0.0:3000/mysite --header "Accept: application/json" --header "Content-Type: application/json"

Generates this in the logs:

Started POST "/mysite" for 127.0.0.1 at 2012-01-11 16:09:48 -0800
  Processing by MyController#create as JSON
  Parameters: {"company"=>{"name"=>"acme", "address"=>"123 Carrot Street"}, "wassup"=>{"company"=>{"name"=>"acme", "address"=>"123 Carrot Street"}, "controller"=>"wassup", "action"=>"create"}}
Completed 200 OK in 5ms (Views: 2.0ms | ActiveRecord: 0.0ms)

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This command with the Accept header:

curl -d '{ "company": { "name": "acme", "address": "123 Carrot Street" } }' http://0.0.0.0:3000/mysite --header "Accept: application/json"

Generates these logs:

Started POST "/mysite" for 127.0.0.1 at 2012-01-11 16:07:26 -0800
  Processing by MyController#create as JSON
  Parameters: {"{ \"company\": { \"name\": \"acme\", \"address\": \"123 Carrot Street\" } }"=>nil}
Completed 200 OK in 7ms (Views: 5.0ms | ActiveRecord: 0.0ms)

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And finally this command with the Content-Type header:

curl -d '{ "company": { "name": "acme", "address": "123 Carrot Street" } }' http://0.0.0.0:3000/mysite --header "Content-Type: application/json"

Generates these logs:

Started POST "/mysite" for 127.0.0.1 at 2012-01-11 16:08:11 -0800
  Processing by MyController#create as */*
  Parameters: {"company"=>{"name"=>"acme", "address"=>"123 Carrot Street"}, "wassup"=>{"company"=>{"name"=>"acme", "address"=>"123 Carrot Street"}, "controller"=>"wassup", "action"=>"create"}}
Completed 200 OK in 4ms (Views: 2.0ms | ActiveRecord: 0.0ms)

Notice the parsed parameters and processing message change subtly with each header type.