Ruby-on-rails Rails 5 API 控制器中未定义的实例方法“respond_to”
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Undefined instance method "respond_to" in Rails 5 API Controller
提问by アレックス
In rails 5 created with --apiI have an error
在创建的 rails 5 中，--api我有一个错误
NoMethodError (undefined method `respond_to' for #<Api::MyController:0x005645c81f0798>
Did you mean? respond_to?):
However, in the documentation for rails 4.2 it says http://edgeguides.rubyonrails.org/4_2_release_notes.html
但是，在 rails 4.2 的文档中，它说http://edgeguides.rubyonrails.org/4_2_release_notes.html
respond_with and the corresponding class-level respond_to have been moved to the responders gem. Add gem 'responders', '~> 2.0' to your Gemfile to use it:
Instance-level respond_to is unaffected:
response_with 和相应的类级别 respond_to 已移至响应者 gem。将 gem 'responders', '~> 2.0' 添加到您的 Gemfile 中以使用它：
实例级 respond_to 不受影响：
And I'm calling the instance method. What's the matter?
我正在调用实例方法。怎么了？
class ApplicationController < ActionController::API
end
# ...
class Api::MyController < ApplicationController
def method1
# ...
respond_to do |format|
format.xml { render(xml: "fdsfds") }
format.json { render(json: "fdsfdsfd" ) }
end
回答by max
ActionController::APIdoes not include the ActionController::MimeRespondsmodule. If you want to use respond_toyou need to include MimeResponds.
ActionController::API不包括ActionController::MimeResponds模块。如果要使用respond_to，则需要包含MimeResponds.
class ApplicationController < ActionController::API
include ActionController::MimeResponds
end
class Api::MyController < ApplicationController
def method1
# ...
respond_to do |format|
format.xml { render(xml: "fdsfds") }
format.json { render(json: "fdsfdsfd" ) }
end
end
end
Source: ActionController::API docs
回答by jpalmieri
As of Rails 4.2, this functionality no longer ships with Rails, but can easily be included with the responders gem (like Max noted in comments above).
从 Rails 4.2 开始，这个功能不再随 Rails 一起提供，但可以很容易地包含在响应者 gem 中（就像上面评论中提到的 Max）。
Add gem 'responders'to your Gemfile, then
添加gem 'responders'到您的 Gemfile，然后
$ bundle install
$ rails g responders:install
Sources:
http://edgeguides.rubyonrails.org/4_2_release_notes.html#respond-with-class-level-respond-tohttps://github.com/plataformatec/responders
来源：
http: //edgeguides.rubyonrails.org/4_2_release_notes.html#respond-with-class-level-respond-to https://github.com/plataformatec/responders
