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尝试在我的 Rails 5 Api 中呈现 JSON 时，我一直收到 ActionView::MissingTemplate 错误。我只想呈现纯 JSON，没有 jbuilder 或其他视图。任何人都可以帮忙吗？

thing_controller.rb:

class Api::ThingController < ApplicationController
  def thing
    render json: {error: 'This is my error message.'}, status: 422
  end
end

thing_controller_test.rb:

require 'test_helper'
class Api::ThingControllerTest < ActionDispatch::IntegrationTest
  test "the truth" do
    get '/api/thing'
    assert_response 422
  end
end

完整的错误信息：

错误：Api::ThingControllerTest#test_the_truth：ActionView::MissingTemplate：缺少模板api/thing/thing，应用程序/thing with {:locale=>[:en], :formats=>[:json], :variants=>[ ], :handlers=>[:raw, :erb, :html, :builder, :ruby, :jbuilder]}。

application_controller.rb:

 class ApplicationController < ActionController::API
    include ActionController::Caching
    include ActionController::ImplicitRender  # want implicit view rendering for JBuilder

  before_action :add_cors_headers


  def …