videos.js

import Immutable from 'immutable'
import { GET_VIDEOS, GET_VIDEO } from 'actions/videos'

export default function videos (state = Immutable.Map(), action) {
  switch (action.type) {
    case GET_VIDEO: 
      return state.updateIn([action.meta.id], Immutable.Map(), video => {
        if (action.pending) return video.set('loading', true)
        if (action.error) return video.set('loading', false)
        return Immutable.fromJS(action.payload).set('loading', false)
      })

    default:
      return state
  }
}