Question

i am using vestal_version in my rails app. And i am wondering how do I show the previous versions edit links with respect to what is at the above entry. My html.erb code is

        <tbody>
                        <% @page.versions.each do |page| %>
                        <tr class="odd">
                          <td><input type="checkbox" /></td>
                          <td> </td>
                          <td><%= page.created_at%></td>
                          <td>
                          <% if params[:version] %>
                          <%= link_to "Previous Version", :version => @page.version-1 %>
                          <%end%>
                        </td>
                        </tr>


                  </div>
         <% end %>

and in controller i have @page.revert_to(params[:version].to_i) if params[:version]

I have attached a link to the screenshot. And if closely observe. the ?version=5 for all the entries. I want to have all the versions that is 1,2,3,4 and 5. How do i do that ?

Update : Image is hyper linked in the comment. I am not allowed add an image as of now.

Answer 1

Use page instead of @page.

<%= link_to "Previous Version", :version => page %>

page changes with each iteration, while @page stays the same.

EDIT:

Since @page.versions.each iterates a collection of versions, it should be passed into the block as version, not page.

<% @page.versions.each do |version| %>
  <tr class="odd">
    <td><input type="checkbox" /></td>
    <td> </td>
    <td><%= version.created_at%></td>
    <td>
    <%= link_to "Show Version", :version => version %>
    </td>
  </tr>
<% end %>

This method only shows the version. Actually reverting a version should be done via POST, since you are making changes to the database.

Reverting negates changes, it does not discard changes. If page is at version 4, and you revert to version 2, it does not delete versions 3 and 4. The version number will revert to 2, but will count as a version itself.

#revert_to does the reversion but does not save. To revert and save, use #revert_to!

---

To properly use #revert_to!, you need to put it in a controller action.

Example, in your pages controller:

def revert
  @page = Page.find params[:id]
  if @page.revert_to!(params[:version_id]) # <= revert_to!
    redirect_to @page
  else
    render :text => "Did not revert"
  end
end

In your routes.rb:

resources :pages do
  member do
    post 'revert_to/:version_id' => 'pages#revert', :as => :revert
  end
end

then in your view:

<% @page.versions.each do |version| %>
  <tr class="odd">
    <td><input type="checkbox" /></td>
    <td> </td>
    <td><%= version.created_at %></td>
    <td>
    <%= link_to "Show Version", :version => version %>
    </td>
    <td>
    <%= button_to "Revert to this version", revert_page_path(@page, version.id) %>
    </td>
  </tr>
<% end %>