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Edit form save

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Save the data to the controller ​

ruby
## app/controllers/articles_controller.rb
class ArticlesController < ApplicationController
  # ...

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

    if @article.update(article_params)
      redirect_to @article
    else
      render 'edit'
    end
  end

  # ...
end

Add link to the edit page ​

erb
<!-- app/views/articles/index.html.erb -->
<%= link_to 'New article', new_article_path %>
<table>
  <tr>
    <th>Title</th>
    <th>Text</th>
    <th colspan="2"></th>
  </tr>

  <% @articles.each do |article| %>
    <tr>
      <td><%= article.title %></td>
      <td><%= article.text %></td>
      <td><%= link_to 'Show', article_path(article) %></td>
      <td><%= link_to 'Edit', edit_article_path(article) %></td>
    </tr>
  <% end %>
</table>
erb
<!-- app/views/articles/show.html.erb -->
<%= link_to 'Edit', edit_article_path(@article) %> |
<%= link_to 'Back', articles_path %>