fnando / has_tags

has_tags
========

Installing
----------

1) Install the plugin with `script/plugin install git://github.com/fnando/has_tags.git`
2) Generate a migration with `script/generate migration add_tagging` and add the following code:

class AddTagging < ActiveRecord::Migration
  def self.up
    create_table :taggings do |t|
      t.references :tag, :user
      t.references :scopable, :taggable, :polymorphic => true
    end

    create_table :tags do |t|
      t.string :name
    end
   
    add_index :tags, :name
    add_index :taggings, [:taggable_type, :taggable_id]
    add_index :taggings, [:scopable_type, :scopable_id]
  end

  def self.down
    drop_table :tags
    drop_table :taggings
  end
end

3) Run the migrations with `rake db:migrate`

Usage
-----

1) Add the method call `has_tags` to your model.

class Link < ActiveRecord::Base
  has_tags :scope => :category
  belongs_to :category
end

class Category < ActiveRecord::Base
  has_many :links
end

@post = Post.first
@category = Category.first

# set tags using the chosen tag separator
@post.tagged_with = "rails, activerecord, models"

# get tags joined with the chosen tag separator
@post.tagged_with

# get all tags as objects
@post.tags

# check if an user tagged this object
@post.tag_owner?(current_user)

# generate a tag cloud
@tags = Tag.cloud(:link, :limit => 100, :scope => @category)

# at the view, call the helper tag_cloud
tag_cloud @tags do |tag_name, css|
  <%= link_to tag_name, tag_path(tag_name), :class => css 
end

Copyright (c) 2008 Nando Vieira, released under the MIT license