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renderメソッドをもう一度呼ぶためにわざとsetStateする

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firebaseのrealtime dbを使用して開発しているときにハマったこと

firebaseのrealtime からデータを取得した後、setStateに成功していたがそれがrender メソッド呼び出してreturnする時までにstateが更新されていなくてもう一度renderメソッドを呼び出したかった。だからわざと必要もないstateを定義してsetStateを呼び出した。それによってrenderされたから目標は達成できた。

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