Composite Series

If you want to use multiple series to generate a single resulting series (e.g. if you want to sum two series, or divide one series by another to get a rate), you can use a composite series.


To create the chart above, simply add the following YAML file and call render_report in any view:

YAML

config/reports_kit/reports/series_composite.yml

name: Percent of Posts That Are Featured
composite_operator: "%"
series:
- measure: post
  filters:
  - key: is_featured
    criteria:
      value: true
  dimensions:
  - author
- measure: post
  filters: 
  dimensions:
  - author

View

app/views/my_controller/my_view.html.haml

= render_report 'series_composite'

Model

app/models/post.rb

class Post < ApplicationRecord
  belongs_to :author
  has_many :post_views, dependent: :destroy
  has_many :posts_tags, dependent: :destroy
  has_many :tags, through: :posts_tags

  include ReportsKit::Model
  reports_kit do
    aggregation :average_time_to_publish, [:average, 'posts.published_at - posts.created_at']
    contextual_filter :for_author, ->(relation, context_params) { relation.where(author_id: context_params[:author_id]) }
    dimension :approximate_views_count, group: 'ROUND(posts.views_count, -1)'
    filter :is_published, :boolean, conditions: ->(relation) { relation.where(status: 'published') }
  end

  STATUSES = %w(draft private published).freeze

  def to_s
    title
  end
end

Model's Columns

id              integer
author_id       integer
title           string
status          string
published_at    datetime
is_featured     boolean
views_count     integer
created_at      datetime
updated_at      datetime