Mongoid Taggable provides some helpers to create taggable documents.
You can simply install from rubygems:
gem install mongoid_taggable
or as a Rails Plugin:
rails plugin install git://github.com/wilkerlucio/mongoid_taggable.git
To make a document taggable you need to include
Mongoid::Taggable into your document and call the
taggable macro with optional arguments:
class Post include Mongoid::Document include Mongoid::Taggable field :title field :content taggable end
Then in your form, for example:
<% form_for @post do |f| %> <p> <%= f.label :title %><br /> <%= f.text_field :title %> </p> <p> <%= f.label :content %><br /> <%= f.text_area :content %> </p> <p> <%= f.label :tags %><br /> <%= text_field_tag 'post[tags]', (@post.tags.join(', ') if @post.tags) %> </p> <p> <button type="submit">Send</button> </p> <% end %>
You can of course use helpers or a
FormBuilder extension to express this in a prettier way. In this case, the text field for tags should receive the list of tags separated by comma (below in this document you will see how to change the separator).
Your document will have a custom
tags= setter which can accept either an ordinary Array or this separator-delineated String.
Tag Aggregation with Counts
This lib can automatically create an aggregate collection of tags and their counts for you, updated as documents are saved. This is useful for getting a list of all tags used in documents of this collection or to create a tag cloud. This is disabled by default for sake of performance where it is unneeded -- see the following example to understand how to use it:
class Post include Mongoid::Document include Mongoid::Taggable field :title field :content taggable :aggregation => true end Post.create!(:tags => "food,ant,bee") Post.create!(:tags => "juice,food,bee,zip") Post.create!(:tags => "honey,strip,food") Post.tags # => ["ant", "bee", "food", "honey", "juice", "strip", "zip"] Post.tags_with_weight # will retrieve: # [ # ['ant', 1], # ['bee', 2], # ['food', 3], # ['honey', 1], # ['juice', 1], # ['strip', 1], # ['zip', 1] # ]
Changing default separator
To change the default separator you may pass a
separator argument to the macro:
class Post include Mongoid::Document include Mongoid::Taggable field :title field :content taggable :separator => ' ' # tags will be delineated by spaces end
- Should subclasses output map/reduce aggregation results to their own collections?
- Perhaps implement operators, <<, etc. for full-on set semantics. See: https://github.com/mlabs/mongoid_taggable/commit/13195805e110a7113b9f04710d9bade39440b63e