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- pry(#<PostsController:0x53b6118>)> Post.all.map{|p| p.tags.map {|t| t.name}}
- => [["cyce", "dupa"], ["dupa samolot"], ["pawel"]]
- pry(#<PostsController:0x53b6118>)> Post.includes(:tags).where('tags.name' => "cyce").count
- => 3
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