Rails 4-嵌套资源-REST API渲染JSON错误

Question

I have these routes:

resources :championships do resources :rounds do resources :games end end

When I try to insert a game by POST I got this error:

NoMethodError in GamesController#create undefined method 'games' for nil:NilClass

But the data is inserted correctly!

Part of GamesController:

before_filter :load_round

def create
    @game = @round.new(model_params)

    if @game.save
        render json: @game, status: :created, location: @round
    else
        render json: @game.errors, status: :unprocessable_entity
    end
end

private

    def model_params
        params.require(:game).permit(:team_1_id, :team_2_id)
    end

    def load_round
        @round = Round.find(params[:round_id])
    end

PS: I am using the same logic to include Rounds inside a Championship whith no problem

Answer 1

As seen in comment, the issue here comes from the location: @round .

As stated in the Rails documentation , the location param sets the HTTP Location header .

It takes an URL as value. It should work if you change this to use the rails url helpers location: round_url(@round) , if your round route is not namespaced or nested.