这是完整的信息

DEPRECATION WARNING: Passing a template handler in the template name
is deprecated. You can simply remove the handler name or pass render
:handlers => [:jbuilder] instead. (called from realtime at
/Users/Arel/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/benchmark.rb:295)

这里是代码：

it "is logged in" do
    post "/api/v1/login",user_login: {email: 'test@test.com',password: '12345678' }
    response.status.should be(201)
  end

什么是模板处理程序,为什么它认为我在模板名称中传递它？什么模板？

编辑：

Sessions_controller.控制器被登录路径调用.

class Api::V1::SessionsController < Devise::SessionsController
    before_filter :authenticate_user!,except: [:create,:destroy]
    before_filter :ensure_params_exist
    skip_before_filter :verify_authenticity_token
 
  def create
    resource = User.find_for_database_authentication(email: params[:user_login][:email])
    return invalid_login_attempt unless resource
 
    if resource.valid_password?(params[:user_login][:password])
        sign_in("user",resource)
        resource.ensure_authentication_token!
        render 'api/v1/sessions/new.json.jbuilder',status: 201
        return
    end
    invalid_login_attempt
  end
 
  def destroy
        current_user.reset_authentication_token
        render json: {success: true}
  end
 
  protected
 
  def ensure_params_exist
    return unless params[:user_login].blank?
    render json: {success: false,message: "missing user_login parameter"},status: 422
  end
 
  def invalid_login_attempt
    render 'api/v1/sessions/invalid.json.jbuilder',status: 401
  end
end