ruby-on-rails - ActionView::MissingTemplate，带有 JSON 的 Rails 5 API

Question

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 View 。谁能帮忙？

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

完整错误信息:

Error: Api::ThingControllerTest#test_the_truth: ActionView::MissingTemplate: Missing template api/thing/thing, application/thing with {:locale=>[:en], :formats=>[:json], :variants=>[], :handlers=>[:raw, :erb, :html, :builder, :ruby, :jbuilder]}.

应用程序 Controller .rb:

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

  before_action :add_cors_headers


  def options
    head(:ok) if request.request_method == "OPTIONS"
  end

Answer 1

这与 an issue 有关在 Rails 5 beta ActionController::API 和 Jbuilder 中。看起来它已被此 pull request 修复.

同时您可以返回纯文本并设置内容类型，如下所示:

render plain: {error: 'This is my error message.'}.to_json, status: 422, content_type: 'application/json'