reduceColection redux

reduceColection.js

import { fromJS, List, Map } from 'immutable';

const reduceColection = (state, response) => {
  if(response) {
    const {
      data,
      page,
      per_page,
      total_count,
    } = response;

    const objects = state.get('objects');
    const ids = state.get('ids');
    const newObjects = {};
    const newIds = data.map((obj) => {
      newObjects[obj.id] = obj;
      return obj.id;
    });

    const finalIds = List(newIds).concat(ids).slice(0, 5);

    const finalObjects = new Map(finalIds.reduce((acc, id) => {
      const key = id.toString();
      acc[key] = newObjects[key] || objects.get(key);
      return acc;
    }, {}));

    return state
      .set('objects', finalObjects)
      .set('ids', finalIds)
      .set('page', page)
      .set('per_page', per_page)
      .set('total_count', total_count);
  }
}

export default reduceColection;