Rails，渲染 json 上的“nil:NilClass 的未定义方法‘变体’”

Question

我正在尝试做一些非常简单的事情，用一些东西渲染一个 json。 如果这算作有用的信息，我确实有一个视图 views/api/initialize.html.erb。 我不知道是什么原因造成的，但变量填充正常，我检查了

我的控制器：

class ApiController < ApplicationController
    def initialize

        @articles = Article.all
        @areas = Area.all
        @languages = Language.all
        data_json = { articles: @articles, areas: @areas, languages: @languages }

        render json: data_json


    end

    def index

    end

end

我的路线：

获取'/init'，控制器：'api'，操作：'initialize'

这是来自 development.log 的完整错误跟踪：

NoMethodError (undefined method `variant' for nil:NilClass):

app/controllers/api_controller.rb:9:in `initialize'
  Rendering /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout
  Rendering /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (3.9ms)
  Rendering /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (2.0ms)
  Rendering /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (14.1ms)
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (44.1ms)
DEPRECATION WARNING: Accessing mime types via constants is deprecated. Please change `Mime::HTML` to `Mime[:html]`. (called from const_missing at /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/http/mime_type.rb:52)
  Rendering /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/index.html.erb
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/_markup.html.erb (0.4ms)
  Rendering /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/console.js.erb within layouts/javascript
  Rendering /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string (0.4ms)
  Rendering /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string (0.3ms)
  Rendering /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/style.css.erb within layouts/inlined_string
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/style.css.erb within layouts/inlined_string (0.4ms)
DEPRECATION WARNING: Accessing mime types via constants is deprecated. Please change `Mime::WEB_CONSOLE_V2` to `Mime[:web_console_v2]`. (called from const_missing at /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/http/mime_type.rb:52)
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/console.js.erb within layouts/javascript (36.5ms)
  Rendering /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/main.js.erb within layouts/javascript
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/main.js.erb within layouts/javascript (0.4ms)
  Rendering /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/error_page.js.erb within layouts/javascript
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/error_page.js.erb within layouts/javascript (0.4ms)
  Rendered /usr/local/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/index.html.erb (59.3ms)

你能找出问题出在哪里吗？ 谢谢。

Answer 1

初始化可能已经被 Ruby 保留了。只需更改一些非保留名称，例如 test_api_initialize 或更好的 api_init。

def api_inits
end

路线：

get '/init' => 'api#api_inits', as: :init