Misago/frontend/src/components/categories/index.js

import moment from "moment"
import React from "react"
import Blankslate from "./blankslate"
import CategoriesList from "./categories-list"
import misago from "misago/index"
import polls from "misago/services/polls"

const hydrate = function(category) {
  return Object.assign({}, category, {
    last_post_on: category.last_post_on ? moment(category.last_post_on) : null,
    subcategories: category.subcategories.map(hydrate)
  })
}

export default class extends React.Component {
  constructor(props) {
    super(props)

    this.state = {
      categories: misago.get("CATEGORIES").map(hydrate)
    }

    this.startPolling(misago.get("CATEGORIES_API"))
  }

  startPolling(api) {
    polls.start({
      poll: "categories",
      url: api,
      frequency: 180 * 1000,
      update: this.update
    })
  }

  update = data => {
    this.setState({
      categories: data.map(hydrate)
    })
  }

  render() {
    const { categories } = this.state

    if (categories.length === 0) {
      return <Blankslate />
    }

    return <CategoriesList categories={categories} />
  }
}

export function select(store) {
  return {
    tick: store.tick.tick
  }
}