ruby on rails - $http service adding unwanted JSON key to request data -

i have simple service i'm using post data rails controller.

my service looks this:

app.service('autorulesservice', function($http) {   return({     createrule: createrule   });    function createrule() {     var request = $http({       method: 'post',       url: '/rules.json',       data: { one: 'two }     });      return request.then(handlesuccess, handleerror);   }    function handlesuccess() {     // body omitted...   }   function handleerror() {     // body omitted...   } }); 

i use service in controller in pretty standard way:

$scope.saverule = function() {   rulesservice.createrule().then(function() {     // stuff...   }); } 

the problem weird unwanted key in parameters when inspect sent data in rails log. "rule" parameter coming from?

processing autoanalysis::rulescontroller#create json    parameters: {"one"=>"two", "rule"=>{}} 

it doesn't appear in request payload (as inspected in chrome dev tools)

and controller action pretty standard (there's no before filters either):

class rulescontroller < applicationcontroller   def create     # note: i'm referencing :auto_analysis_rule parameter here because      # that's desired param key name. doesn't exist in request     # shown here.     render json: rule.create(params[:auto_analysis_rule])   end end 

and can't find mention of $http inferring root json key url or in docs.

where "rule" param key coming from?

rails automatically wraps parameters attributes of model. if one attribute of rule model, payload like: {"rule" => {"one" => "two"}}

this functionality removes need top-level key contains attributes. in other words, following payloads treated same if attr1 , attr2 fields in mymodel model:

{ "mymodel" : { "attr1" : "val1", "attr2" : "val2" } }  { "attr1" : "val1", "attr2" : "val2" } 

this functionality can disabled per-controller or app-wide in initializer. check out answer more information: rails 3 params unwanted wrapping