lore extract reducer [model]/byId

lore extract reducer post/byId

import { ActionTypes } from 'lore-utils';
import _ from 'lodash';

/*
 * byId Reducer Blueprint
 */

function addOrUpdateById(nextState, payload) {
  const id = payload && payload.id;
  let existingModel = null;

  if (id) {
    existingModel = nextState[id];
    if (existingModel) {
      nextState[id] = _.assign({}, payload, {
        cid: existingModel.cid
      });
    } else {
      nextState[id] = payload;
    }
  }
  return nextState;
}

function removeById(nextState, payload) {
  const id = payload && payload.id;
  if (id) {
    delete nextState[id];
  }
  return nextState;
}

export default function byId(state, action) {
  state = state || {};
  let nextState = _.assign({}, state);

  switch (action.type) {
    case ActionTypes.add('post'):
      return addOrUpdateById(nextState, action.payload);

    case ActionTypes.update('post'):
      return addOrUpdateById(nextState, action.payload);

    case ActionTypes.remove('post'):
      return removeById(nextState, action.payload);

    case ActionTypes.fetchPlural('post'):
      action.payload.data.forEach(function(datum) {
        addOrUpdateById(nextState, datum);
      });
      return nextState;

    default:
      return nextState
  }
};