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Versions: 5
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Contents
module Noodall
module Tagging
extend ActiveSupport::Concern
included do
key :tags, Array, :index => true
end
module ClassMethods
def tag_cloud(options = {})
return [] if self.count == 0 # Don't bother if there is nothing in this collection
query = query(options.reverse_merge(
:order => 'value DESC'
))
tags_map = collection.map_reduce(tag_cloud_map, tag_cloud_reduce, {:query => query.criteria.to_hash, :out => "#{self.collection_name}_tags" })
if tags_map.count > 0
tags = tags_map.find({}, query.options.to_hash ).to_a.collect{ |hash| Tag.new(hash['_id'], hash['value']) }
tags
else
[]
end
end
def tag_cloud_map
"function(){" +
"this.tags.forEach(" +
"function(z){" +
"emit( z , 1 );" +
"}" +
")}"
end
def tag_cloud_reduce
"function( key , values ){" +
"var total = 0;" +
"for ( var i=0; i<values.length; i++ ){" +
"total += values[i];" +
"}" +
"return total;" +
"}"
end
end
module InstanceMethods
def tag_list=(string)
self.tags = string.to_s.split(',').map{ |t| t.strip.downcase }.reject(&:blank?).compact.uniq
end
def tag_list
tags.join(', ')
end
def related(options ={})
self.class.all(options.merge({:_id => {'$ne' => self._id}, :tags => /(#{self.tags.join('|')})/i}))
end
end
class Tag
attr_reader :name, :count
def initialize(name, count)
@name = name
@count = count.to_i
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems