webpack/assets/javascripts/react_app/redux/API/APISelectors.js
import { STATUS } from '../../constants';
export const selectAPI = state => state.API;
export const selectAPIByKey = (state, key) => selectAPI(state)[key] || {};
export const selectAPIStatus = (state, key) =>
selectAPIByKey(state, key).status;
export const selectAPIPayload = (state, key) =>
selectAPIByKey(state, key).payload || {};
export const selectAPIResponse = (state, key) =>
selectAPIByKey(state, key).response || {};
export const selectAPIError = (state, key) =>
selectAPIStatus(state, key) === STATUS.ERROR
? selectAPIResponse(state, key)
: null;
export const selectAPIErrorMessage = (state, key) => {
const error = selectAPIError(state, key);
return error && error.message;
};