Chartkick: Undefined method `line_chart'

I am working on a Rails 6 application and I am trying setup Chartkick for charts in my application.

I installed Chartkick this way:

1. For Rails 6 / Webpacker, run:

   yarn add chartkick chart.js
   

2. And in app/javascript/packs/application.js, add:

   require("chartkick")
   require("chart.js")
   

3 Install Groupdate to use the group_by_day method

gem 'groupdate'

And then run bundle install.

However, when I added this line to my Dashboard views:

<%= line_chart @products.group_by_day(:created_at).count %>

To show a graph for products using the @products variable:

class Admins::DashboardController < ApplicationController
  before_action :authenticate_admin!

  # GET /dashboards
  # GET /dashboards.json
  def index
    @products = Product.all
  end
end

I get the following error:

undefined method `line_chart'

I'm wondering what I am doing wrong.

I finally figured it out.

Here's how I fixed it:

The issue was that I was missing the first requirement which is :

Adding this line to your application's Gemfile:

gem "chartkick"

And then running bundle install

My initial misconception was that I did not need this requirement since I am working with a Rails 6 application.

I thought that this step only applies to Rails 5 applications and below and not on Rails 6 applications since I am running yarn add chartkick chart.js. But it turned out to be untrue. It is required for both Rails 6 applications and Rails 5 applications and below.

That's all.

I hope this helps