List of categories about nextein HOT 3 CLOSED

@vadimdemedes I'll add that as a feature in request to the list. Meanwhile, what I do is to mix withPosts and withPost on the same page. It might sound a bit strange, but you can get those in the same page.

Check the docs page in nextein-www. In that case I'm first filtering by an specific category to retrieve all posts in that category and subcategories.

https://github.com/elmasse/nextein-www/blob/master/pages/docs.js#L22:L24

But I agree that might become useful to list all categories without accessing the posts.

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Ok, thanks!

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As mentioned in #19, the experimental entries can be used to retrieve data / meta data from posts without making them part of the NEXT_DATA global in exported sites.

To add a list of categories to our page component we can do something like this:

import React, { Component } from 'react'
import withPosts, { entries } from 'nextein/posts'

export default withPosts(class Index extends Component {
  static async getInitialProps() {
    const all = await entries()
    const categories = [ ...new Set(all.map( p => p.data.category )) ] //unique values

   return { categories }
  }

  render () {
     const { posts, categories } = this.props

    return (/* Render your posts here */)
  }
})

It might be possible that the categories will be added to the API but I'm still trying to keep the API surface as minimum as possible.

Hope that helps. Please let me know your thoughts on that.

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