94 lines
2.5 KiB
Ruby
94 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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class Admin::Metrics::Retention
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CACHE_TTL = 5.minutes.freeze
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class Cohort < ActiveModelSerializers::Model
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attributes :period, :frequency, :data
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end
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class CohortData < ActiveModelSerializers::Model
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attributes :date, :rate, :value
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end
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attr_reader :loaded
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alias loaded? loaded
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def initialize(start_at, end_at, frequency)
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@start_at = start_at&.to_date
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@end_at = end_at&.to_date
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@frequency = %w(day month).include?(frequency) ? frequency : 'day'
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@loaded = false
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end
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def cache_key
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['metrics/retention', @start_at, @end_at, @frequency].join(';')
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end
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def cohorts
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load
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end
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protected
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def load
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unless loaded?
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@values = Rails.cache.fetch(cache_key, expires_in: CACHE_TTL) { perform_query }
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@loaded = true
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end
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@values
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end
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def perform_query
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sql = <<-SQL.squish
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SELECT axis.*, (
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WITH new_users AS (
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SELECT users.id
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FROM users
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WHERE date_trunc($3, users.created_at)::date = axis.cohort_period
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),
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retained_users AS (
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SELECT users.id
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FROM users
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INNER JOIN new_users on new_users.id = users.id
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WHERE date_trunc($3, users.current_sign_in_at) >= axis.retention_period
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)
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SELECT ARRAY[count(*), (count(*))::float / (SELECT GREATEST(count(*), 1) FROM new_users)] AS retention_value_and_rate
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FROM retained_users
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)
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FROM (
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WITH cohort_periods AS (
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SELECT generate_series(date_trunc($3, $1::timestamp)::date, date_trunc($3, $2::timestamp)::date, ('1 ' || $3)::interval) AS cohort_period
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),
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retention_periods AS (
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SELECT cohort_period AS retention_period FROM cohort_periods
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)
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SELECT *
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FROM cohort_periods, retention_periods
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WHERE retention_period >= cohort_period
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) as axis
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SQL
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rows = ActiveRecord::Base.connection.select_all(sql, nil, [[nil, @start_at], [nil, @end_at], [nil, @frequency]])
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rows.each_with_object([]) do |row, arr|
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current_cohort = arr.last
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if current_cohort.nil? || current_cohort.period != row['cohort_period']
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current_cohort = Cohort.new(period: row['cohort_period'], frequency: @frequency, data: [])
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arr << current_cohort
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end
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value, rate = row['retention_value_and_rate'].delete('{}').split(',')
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current_cohort.data << CohortData.new(
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date: row['retention_period'],
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rate: rate.to_f,
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value: value.to_s
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)
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end
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end
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end
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