ruby on rails - Json file output is [null, null, null, null] -

i'm trying save , output data website when check movies.json file shows,

[null,null,null,null,null,null,null,null] 

that's null every id in database.

this log rails server,

started "/movies.json" 127.0.0.1 @ 2015-08-25 07:52:48 +0200   activerecord::schemamigration load (0.1ms)  select "schema_migrations".* "schema_migrations" processing moviescontroller#index json   user load (0.4ms)  select  "users".* "users" "users"."id" = ?  order "users"."id" asc limit 1  [["id", 1]]   movie load (0.1ms)  select "movies".* "movies" completed 200 ok in 116ms (views: 10.1ms | activerecord: 4.5ms) 

in application_controller.rb have

respond_to :html, :json 

my movies_controller.rb

class moviescontroller < applicationcontroller    def index     respond_with movie.all   end    def create     respond_with movie.create(movie_params)   end    private   def movie_params     params.require(:movie).permit(:title)   end  end 

my movie.rb model,

class movie < activerecord::base    def as_json(options = {})   end  end 

if check movie.all in rails console see correct values, it's not outputting right in json output.

you overwriting as_json empty implementation returns nothing.

if need overwrite default serializer, have specify fields want serialized

def as_json(options = {})  { :username => username, :name => first_name + " " + last_name } end 

if default implementation enough you, remove

def as_json(options = {}) end