Adding view count to your Nextjs Blog

https://media.dev.to/cdn-cgi/image/width=1000,height=420,fit=cover,gravity=auto,format=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fp5w4mv1euvobkg2z03ig.png

––– views

2 mins

7 Nov 2021

Alright lads, this will be a quick one. I want to add the views count functionality on my personal portfolio website's blog section.
https://media3.giphy.com/media/0DYipdNqJ5n4GYATKL/giphy.gif?cid=ecf05e47cyftq8cfvkwqriyg5md5zc2irw1cb9u5fque0nbk&rid=giphy.gif&ct=g
Expected behavior:
  • Blogs Page : List of blogs -> Show count.
  • Blog Page : Particular Article -> Show count and Increment count.
How to achieve:
  • Use supabase to store count by slug
  • Stored procedure to increment count
Tools that I'll need:
  • supabase : open source firebase alternative
  • swr : data fetching

Setting up supabase table :

Create a table
views
with schema like such:
  • slug -> text -> primary key
  • created_at -> timestamp -> now()
  • count -> int2

Updating
count
:

  • Fetch count
  • Increment one
  • Fetch count again
Now we can reduce this to one db call using stored procedures:
https://imgur.com/S8JB0LC.png
create function increment (slug_text text) returns void as $$ update views set count = count + 1 where slug = slug_text; $$ language sql volatile;

In NextJs:

We'll define a route for ease: - /api/view/{slug} and then we'll use the
POST
request to register a view and
GET
to increment the view count. Our handler code will look like this: views.ts
import { createClient, PostgrestError } from "@supabase/supabase-js"; const supabase = createClient( process.env.SUPABASE_URL, process.env.SUPABASE_KEY ); interface SupabaseResult { data?: { count: number }; error?: PostgrestError; } /// const getViews = async (slug: string): Promise<number> => { const { data: views, error }: SupabaseResult = await supabase .from("views") .select(`count`) .match({ slug: slug }) .single(); if (error && error.details.includes(`0 rows`)) { const { data, error }: SupabaseResult = await supabase .from(`views`) .insert({ slug: slug, count: 1 }, { returning: `representation` }) .single(); return data.count; } if (!views) { return 0; } return views.count; }; /// const registerView = async (slug: string): Promise<void> => { const { data, error } = await supabase.rpc("increment", { slug_text: slug, }); }; export { getViews, registerView };
  • /api/view/[slug].ts
// /api/view/[slug].ts // Next.js API route support: https://nextjs.org/docs/api-routes/introduction import { getViews, registerView } from "lib/views"; import type { NextApiRequest, NextApiResponse } from "next"; interface Data { message?: string; status?: number; count?: number; } /// export default async function handler( req: NextApiRequest, res: NextApiResponse<Data> ): Promise<void> { const slug = req.query.slug.toString(); /// if (!slug) { return res.status(400).json({ message: `invalid slug` }); } if (req.method == `POST`) { await registerView(slug); } const count = await getViews(slug); return res.status(200).json({ count: count }); }

ViewCounter Component

  • view_counter.tsx
import fetcher from "lib/fetcher"; import { Views } from "lib/types"; import { useEffect } from "react"; import useSWR from "swr"; interface Props { slug: string; } const ViewCounter = ({ slug }: Props) => { const { data } = useSWR<Views>(`/api/views/${slug}`, fetcher); useEffect(() => { const registerView = () => fetch(`/api/views/${slug}`, { method: "POST", }); registerView(); }, [slug]); return ( <span>{`${ (data?.count ?? 0) > 0 ? data.count.toLocaleString() :"–––" } views`}</span> ); }; export default ViewCounter;
Our views in action:
https://imgur.com/0qw4uen.png
https://imgur.com/0lTteEJ.png

The code of this project lives at : https://github.com/100lvlmaster/100lvlmaster.in

You can find me at: https://100lvlmaster.in

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