validates :content, presence: true, length: { maximum: 50 }
-
:content先頭のコロンはシンボル -
presence:メソッド内の後ろコロンはキーワード引数 -
length:メソッド内の後ろコロンはキーワード引数 -
maximum:ハッシュの内側で後ろコロンはシンボルをキーにしたハッシュ
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