Question

I am building an iOS app and it needs to post to a RoR API.

To test the POST, I am running this command:

curl -d @/tmp/data localhost:3000/api/ratings

Where /tmp/data contains an array of hashes:

[    {        "uid": "gilt_162929239",        "rate": 1    }   ]

In Ruby, params looks like this:

[1] pry(#<Api::PromotionRatingsController>)> params
=> {"    {        \"uid\": \"good_162929239\",        \"rate\": 1    }   "=>nil,
 "format"=>"json",
 "action"=>"create",
 "controller"=>"api/ratings"}

How do I get Rails to create the array of hashes for me to iterate over with each?

Edit: I see I was missing headers.

Adding to the curl command line:

--header "Accept: application/json" --header "Content-type: application/json"

Now, here are my params:

[1] pry(#<Api::PromotionRatingsController>)> params
=> {"_json"=>[{"uid"=>"good_162929239", "rate"=>1}],
 "format"=>"json",
 "action"=>"create",
 "controller"=>"api/ratings",
 "promotion_rating"=>{"_json"=>[{"uid"=>"good_162929239", "rate"=>1}]}}

Still not right.

Answer 1

According to this:

if you’ve turned on config.wrap_parameters in your initializer or
calling wrap_parameters in your controller, you can safely omit the
root element in the JSON/XML parameter. The parameters will be cloned
and wrapped in the key according to your controller’s name by default.

So, my guess is that you either need to include a root element, or set config.wrap_parameters.