Ruby on Rails error undefined method 'title' for nil: nilclass

First understand this sentence, in Ruby, the method is divided into
public, private
 And protected
 Three kinds, only public
 The method can act as the controller action.

My error code is as follows:

controlle


class ArticlesController <ApplicationController
def new
end

def create
params.permit!
@article = Article.new (params [: article])

@ article.save
redirect_to @article
end

private
  def article_params
    params.required (: article) .permit (: title,: text)
  end

  def show
  @article = Article.find (params [: id])
  end
end

view show.html.erb

<p>
<strong> Title: </ strong>
<% = @ article.title%>
</ p>

<p>
<strong> Text; </ strong>
<% = @ article.text%>
</ p>

The error message is:

NoMethodError in Articles # show
Showing /home/huihui/Documents/ruby/blog/app/views/articles/show.html.erb where line # 3 raised:

undefined method `title‘ for nil: NilClass

The solution is:

In the control file:


class ArticlesController <ApplicationController
def new
end

def create
params.permit!
@article = Article.new (params [: article])

@ article.save
redirect_to @article
end

  def show
  @article = Article.find (params [: id])
  end

  private
  def article_params
    params.required (: article) .permit (: title,: text)
  end
end

Just change the show method to public