#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
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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目前，我使用了一种非常简单的方法，效果很好：只需包含一个
Array字段。这可行，但我对 Image.any_in map/reduce 的性能仍然有点怀疑。我认为该映射/归约可能有更好的解决方案，但尚未找到。
For now, I used a very simple approach, that works very well: Just include an
Array-field.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.
尝试 mongoid_taggable gem。它确实想要你正在寻找的。
Try mongoid_taggable gem. It does want you are looking for.
mongoid-tags-arent-hard gem 似乎更有能力（并且更积极地维护） ）比我见过的其他宝石。
The mongoid-tags-arent-hard gem seems more capable (and more actively maintained) than the other gems I've seen.
这是一个用于map/reduce和实时聚合策略的“可扩展”解决方案 mongoid_taggable_with_context
here it is a "scalable" solution for map/reduce and real time aggregation strategies mongoid_taggable_with_context