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module Mongoid
module Document
module Taggable
def self.included(base)
base.class_eval do |klass|
klass.field :tags, :type => Array, :default => []
klass.index({ tags: 1 }, { background: true })
include InstanceMethods
extend ClassMethods
end
end
module InstanceMethods
def tag_list=(tags)
self.tags = tags.to_s.split(",").collect{ |t| t.strip }.delete_if{ |t| t.blank? }
end
def tag_list
self.tags.join(", ") if tags
end
def tags
super || []
end
end
module ClassMethods
def all_tags(scope = {})
map = %Q{
function() {
if(this.tags){
this.tags.forEach(function(tag){
emit(tag, 1)
});
}
}
}
reduce = %Q{
function(key, values) {
var tag_count = 0 ;
values.forEach(function(value) {
tag_count += value;
});
return tag_count;
}
}
tags = self
tags = tags.where(scope) if scope.present?
results = tags.map_reduce(map, reduce).out(inline: true)
results.to_a.map!{ |item| { :name => item['_id'], :count => item['value'].to_i } }
end
def scoped_tags(scope = {})
warn "[DEPRECATION] `scoped_tags` is deprecated. Please use `all_tags` instead."
all_tags(scope)
end
def tagged_with(tags)
tags = [tags] unless tags.is_a? Array
criteria.in(:tags => tags)
end
def tagged_without(tags)
tags = [tags] unless tags.is_a? Array
criteria.nin(:tags => tags)
end
def tagged_with_all(tags)
tags = [tags] unless tags.is_a? Array
criteria.all(:tags => tags)
end
def tag_list
self.all_tags.collect{|tag| tag[:name]}
end
end
end
end
end