mergeメソッドとは、ハッシュを結合させることができる、Rubyのメソッドである
post = { name: "さとう", text: "こんにちは"}
uid = { user_id: "1" }
post.merge(uid)
#=> {:name=>"さとう", :text=>"こんにちは", :user_id=>"1"}
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