that's basically going above rails, using mysql where clause
but with rails:
def tagging=(tagging)
self.tags.each do |tag|
tag.destroy unless tagging.include? (tag[:technology_id].to_s)
end
tagging.each do |tag|
tags.build(:technology_id => tag) unless tags.any?{|t|
t.technology_id.to_i == tag.to_i}
end
end
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