Rails: render doesn't work, still get `Template is missing` - ruby-on-rails

Question

I am currently learning Rails Guides. I went through the steps but still encountered a mistake.
My Ruby version is ruby 2.1.1p76 and the Rails version is 4.0.4.
As the guide directed, I created an Article Controller.
class ArticlesController < ApplicationController
def new
end
def create
render plain: params[:article].inspect
end
end
I should get {"title"=>"First article!", "text"=>"This is my first article."} but the output turned out to be
Template is missing
Missing template articles/create, application/create with {:locale=>[:en], :formats=>[:html], :handlers=>[:erb, :builder, :raw, :ruby, :jbuilder, :coffee]}.`
Here is my related routes:
articles GET /articles(.:format) articles#index
POST /articles(.:format) articles#create
Update: render plain: is a new method introduced in Rails 4.1.0 referred to this issue.

Answer 1

In the render method, plain option was added in Rails 4.1 and you are using Rails 4.0.4. So, rails ignored this option and started looking for a template named articles/create as you are in ArticlesController#create action. Obviously, the template doesn't exist so you get the error Template is missing.
Refer to the discussion on this topic on Github: Introduce render :plain and render :html, make render :body as an alias to render :text
Now, for using the below mentioned syntax you would need to upgrade to Rails 4.1:
render plain: params[:article].inspect
With your current version of Rails 4.0.4, you can go for:
render text: params[:article].inspect

Answer 2

If you want to see textual information of params[:article] on your page then you can use render text
try this
class ArticlesController < ApplicationController
def new
end
def create
render text: params[:article].inspect
end
end
You will get
{"title"=>"First article!", "text"=>"This is my first article."}
# i.e. your params(whatever params hash contains)

Answer 3

Change Rails version in your Gemfile:
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.1.6'
Then run:
bundle install
Make sure that your Rails version now is > 4.1

Answer 4

You no need template means you could use render nothing: true
Try like this:
class ArticlesController < ApplicationController
def new
end
def create
params[:article].inspect
render nothing: true
end
end
Please refer this link click here

Answer 5

You may want to read through the following documentation.
Rendering pure text is most useful when you're responding to Ajax or
web service requests that are expecting something other than proper
HTML.