Ruby on Rails
Acts As Taggable Gem (Version #16)

There are two versions of acts_as_taggable:

The plugin: Acts As Taggable Plugin
The gem: thats what this page is about!

More information on the Gem can be found here:

Issues:

The Gem has some issues with Rails 1.1.0, see here
So be sure to upgrade to 1.1.2 or later!
How To Make It Works With Postgresql

This is an example how to add / edit / list tags

In the actions NEW and EDIT _form.rhtml I added a field for tags

Tags for this Item

<= text_field_tag( ‘tags’, ’’, “value” => ”#{h @item.tag_names.join(” “)}”) >

I ran into some stringify_keys! issues, which is why it’s done this way.

And my items_controller was updated with an additional line to save the tags

def update
  @item = Item.find(params[:id])
  @item.tag(params[:tags])
  if @item.update_attributes(params[:item])
    flash[:notice] = 'Item was successfully updated.'
    redirect_to :action => 'show', :id => @item
  else
    render :action => 'edit'
  end
end

and in the list:

tags for this Item: <=h @item.tag_names.join(” “) >

The problem with the above code is that you cannot replace tags, only add them. If you would like a tag field type of set up, do this:

class Item <ActiveRecord::Base
  def tag_text
    tag_names.join(" ")
  end
  def tag_text=(tags)
    tag(tags, :clear => true)
  end
end

Then all you need to do in the RHTML to add the field:

<= text_field 'item', 'text_tags' >

And to show:

Tags: <=h @item.text_tags >

This keeps tag hanlding transparent and out of the controller, too.