Unknown action, Ruby on Rails 4 Beginner, destroy action is unknown

Question

I get " The action could not be found for ArticleController " After pressing "delete It", on my delete page. I think it can not find destroy function! What is missing here?

Controller:

class ArticleController < ApplicationController

def index
  @article= Article.all
end

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

def new
 @article= Article.new
end

def create
  @article= Article.new(user)

  if @article.save
      redirect_to(:action => 'index')
  else
      redirect_to(:action => 'index')
  end
end

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

def destroy
  article.find(params[:id]).destroy
  redirect_to(:action => 'index')
end

private
  def user
  params.require(:article).permit(:title, :text)
  end
end

The routes.rb

 Rails.application.routes.draw do

  resources :article 
   match ':controller(/:action(/:id))', :via => [:get, :post]
  #..

my delete.html.erb

  <h2>Delete</h2>

  <%= form_for :article, :url => url_for(:action => 'destroy', :id => @article) do |f| %>
    <%= @article.title %>
    <%= submit_tag("Delete It") %>
  <% end %>

Answer 1

I see a few things wrong with the code you posted.

First, your controllers should be the plural name of your resource so in this case it should be ArticlesController.

Second, in regards to the error you're getting, when using resources :articles in your routes file the destroy action is mapped to a DELETE request. Your form is trying to GET the destroy action.

What you'll want to do to fix that is

<%= form_for :article, :url => url_for(:action => 'destroy', :id => @article), :method => :delete do |f| %>

Take a look at the Rails Routing Guide for more information on how Rails uses REST.

Answer 2

Firstly,your destroy method is not valid and not necessary.Remove it from the controller.

change your delete methods as

def delete
  @article= Article.find(params[:id])
  if @article.destroy
  redirect_to(:action => 'index')
  else
  render 'delete'
end

And finally,change your form_for as

<%= form_for :article, :url => url_for(:action => 'delete', :id => @article) do |f| %>
    <%= @article.title %>
    <%= submit_tag("Delete It") %>
  <% end %>

Note: And also as @brendon mentioned,change your controller name to plural.As per now it is singular which is against the naming conventions of Rails.

Answer 3

Change the code in your delete.html.erb to

<h2>Delete</h2>

<%= @article.title %> <%= button_to 'Delete It', article, method: :delete %>