What are good solutions for tagging in Rails with MongoID?
It seems that it is really simple to just add a hash or array to a document, but I am not sure if that is the best approach.
Maybe some Gem? Or a simple trick with nested documents?
For now, I used a very simple approach, that works very well: Just include an Array
-field.
#app/models/image.rb
class Image
include Mongoid::Document
include Mongoid::Timestamps
field :message, :type => String
field :tags, :type => Array
def self.images_for tag
Image.any_in(:tags => [tag])
end
end
#routes.rb
match "tag/:tag" => "images#tag"
#/app/controller/images_controller.rb
class ImagesController < ApplicationController
# GET /tag
# GET /tag.xml
def tag
@images = Image.images_for params[:tag]
respond_to do |format|
format.html { render "index" }
format.xml { render :xml => @images }
end
end
end
This works, but I am a still a little doubtfull about the performance of the Image.any_in map/reduce. I think there may be a better solution for that map/reduce but have not found it, yet.
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