module ArticlesHelper
  def article_params 
    params.require(:article).permit(:title, :body)
  end 

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

module ArticlesHelper
  def article_params 
    params.require(:article).permit(:title, :body)
  end 

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

Rename get_article to retrieve_article for clarity
Rename get_article to retrieve_article for clarity
