Can you specify a date range for chartkick? - ruby-on-rails

Question

I'm using chartkick to create some line charts to visualize data in my Rails app. At the moment, however, it shows ALL of the data in my database. Obviously this isn't always ideal. I'd like to give the user the ability to specify the date range of the data shown. I would use the created_at value of the record.
I cannot find any instructions in the documentation on how to do this.
https://github.com/ankane/chartkick.js?files=1
I have created a date picker which will give me a URL like http://localhost:3000/metrics?utf8=%E2%9C%93&search%5Bdate_from%5D=2019-11-01&search%5Bdate_to%5D=2019-11-17&commit=Search
Can chartkicker somehow access those parameters?
In my code a Club has many DailyMetrics, and I've created a metrics action in the clubs controller.
View
<%= javascript_include_tag "https://google.com/jsapi" %>
<div class="row">
<h1>Metrics</h1>
<div class="pull-right range-query">
<%= form_tag metrics_path, method: :get do %>
<%= text_field_tag 'search[date_from]', #search.date_from %>
<%= text_field_tag 'search[date_to]', #search.date_to %>
<%= submit_tag 'Search', class: 'btn search-button' %>
<% end %>
</div>
</div>
<h3>Total active students</h3>
<%= line_chart #club.daily_metrics.group(:created_at).sum(:total_active_students), library: { animation: { easing: 'easeOutQuad'}} %>
<h3>Lost students</h3>
<%= line_chart #club.daily_metrics.group(:created_at).sum(:lost_students), library: { animation: { easing: 'easeOutQuad'}} %>
<h3>New students</h3>
<%= line_chart #club.daily_metrics.group(:created_at).sum(:new_students), library: { animation: { easing: 'easeOutQuad'}} %>
Controller
def metrics
#club = current_club
#search = MetricSearch.new(params[:search])
#metrics = #search.scopeContr
end
Model for searching for metrics
class MetricSearch
attr_reader :date_from, :date_to
def initialize(params)
params ||= {}
#date_from = parsed_date(params[:date_from], 7.days.ago.to_date.to_s)
#date_to = parsed_date(params[:date_to], Date.today.to_s)
end
def scope
DailyMetric.where('created_at BETWEEN ? AND ?', #date_from, #date_to)
end
private
def parsed_date(date_string, default)
Date.parse(date_string)
rescue ArgumentError, TypeError
default
end
end
Is what I'm trying to do possible?

Answer 1

I posted a link to an great article in your comments, but you can use a gem called gem 'groupdate' as well.
# Gemfile
gem 'groupdate'
Assume your user model has_many :orders and you want to find out their spending over the past 6 month:
# order.rb
def self.monthly_spending
group_by_month(:date, last: 6, current: false).sum('orders.total')
end
In your view:
<%= line_chart current_user.orders.monthly_spending %>
Here is another tutorial how to group by date with chartkick and groupdate gem.
If you want to preselect a from-to-date for query you can setup a datepicker in your frontend and send the params to your controller
def show
orders = Order.where('created_at > %s AND created_at < %s', params[:start_date], params[:end_date])
end
call like above the group_by methods on your prefiltered list of orders.