Screencast: Model Versioning

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Download (14.4 MB, 9:28)

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Weitere Resourcen zu diesem Screencast:

• Vestal Versions
• Hirb
• Full episode source code

Verwendung in der Konsole

[bash] sudo rake gems:install script/generate vestal_versions_migration script/generate migration version_existing_pages rake db:migrate [/bash]

Quellcode:

[ruby] # config/environment.rb config.gem ‘laserlemon-vestal_versions’, :lib => ‘vestal_versions’, :source => ‘http://gems.github.com’

# models/page.rb class Page < ActiveRecord::Base versioned end

# version_existing_pages migration say_with_time “Setting initial version for pages” do Page.find_each(&:touch) end

# pages_controller.rb def show @page = Page.find(params[:id]) @page.revert_to(params[:version].to_i) if params[:version] end

# script/console p = Page.all p.versions p.revert_to(7.minutes.ago) p.content p.revert_to(:last)

[/ruby]

[xhtml]

<%= link_to “Edit”, edit_page_path(@page) %> | Version <%= @page.version %> <% if @page.version > 1 %> | <%= link_to “Previous version”, :version => @page.version-1 %> <% end %> <% if params[:version] %> | <%= link_to “Latest version”, :version => nil %> <% end %>

[/xhtml]