그리고 write 리덕스 모듈에서 UPDATE_POST 액션과 updatePostSaga를 만드세요.

modules/write.js

import { createAction, handleActions } from 'redux-actions';
import createRequestSaga, {
  createRequestActionTypes,
} from '../lib/createRequestSaga';
import * as postsAPI from '../lib/api/posts';
import { takeLatest } from 'redux-saga/effects';

(...)
const [
  UPDATE_POST,
  UPDATE_POST_SUCCESS,
  UPDATE_POST_FAILURE,
] = createRequestActionTypes('write/UPDATE_POST'); // 포스트 수정

(...)
export const updatePost = createAction(
  UPDATE_POST,
  ({ id, title, body, tags }) => ({
    id,
    title,
    body,
    tags,
  }),
);

// 사가 생성
const writePostSaga = createRequestSaga(WRITE_POST, postsAPI.writePost);
const updatePostSaga = createRequestSaga(UPDATE_POST, postsAPI.updatePost);

export function* writeSaga() {
  yield takeLatest(WRITE_POST, writePostSaga);
  yield takeLatest(UPDATE_POST, updatePostSaga);
}

(...)

const write = handleActions(
  {
    (...)
    [UPDATE_POST_SUCCESS]: (state, { payload: post }) => ({
      ...state,
      post,
    }),
    [UPDATE_POST_FAILURE]: (state, { payload: postError }) => ({
      ...state,
      postError,
    }),
  },
  initialState,
);

export default write;

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