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React Reduxでオブジェクトの一部のプロパティだけ更新したい

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概要

React Reduxでstateにオブジェクト形式で値を保持する場合、画面から何かしら更新が発生した場合にstateの一部のプロパティだけ、更新したいケースがあると思います。どういうふうに実装したらよいか少し悩んだので、結果のメモを残しておきます。

実装メモ

下記のように2つのアクションタイプで更新するプロパティを各々の、ものだけにするときの実装方法です。対象はreducersになります。

reducer.js
const initialState = {
  testObject: {
    name1: '',
    name2: ''
  }
};

export default function inputReducer(state = initialState, action) {
  switch (action.type) {
    case 'INPUT_NAME1':
      return {
        testObject: {...state.testObject, name1: action.payload.name1}
      };
    case 'INPUT_NAME2':
      return {
        testObject: {...state.testObject, name2: action.payload.name2}
      };
    default:
      return state;
  }
}
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