Class: Lookout::FunnelPresenter

Inherits:
Object
  • Object
show all
Defined in:
app/presenters/lookout/funnel_presenter.rb

Overview

this is incredibly naive and needs some tlc

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(funnel, event_query) ⇒ FunnelPresenter

Returns a new instance of FunnelPresenter.



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# File 'app/presenters/lookout/funnel_presenter.rb', line 6

def initialize(funnel, event_query)
  @funnel = funnel
  @event_query = event_query.joins(:visit)
end

Instance Attribute Details

#steps ⇒ Object (readonly)

Returns the value of attribute steps.



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# File 'app/presenters/lookout/funnel_presenter.rb', line 5

def steps
  @steps
end

Instance Method Details

#as_json ⇒ Object 



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# File 'app/presenters/lookout/funnel_presenter.rb', line 64

def as_json
  {
    steps: @steps.as_json,
    total: total
  }
end

#build ⇒ Object 



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# File 'app/presenters/lookout/funnel_presenter.rb', line 11

def build
  if Lookout.config.goals.none? || @funnel.goals.none?
    @steps = []
    return self
  end

  queries = {
    totals: @event_query.select("count(distinct(#{Lookout.event.table_name}.visit_id)) as unique_visits, '_internal_total_visits_' as name, count(distinct #{Lookout.event.table_name}.id) as total_events, 0 as sort_order")
  }
  selects = ["SELECT unique_visits, name, total_events, sort_order from totals"]
  last_goal = nil
  map = {}.with_indifferent_access

  # Use funnel's goals in order, not all configured goals
  @funnel.goals.each_with_index do |goal, index|
    queries[goal.id] = @event_query.select("count(distinct(#{Lookout.event.table_name}.visit_id)) as unique_visits, '#{goal.id}' as name, count(distinct #{Lookout.event.table_name}.id) as total_events, #{index + 1} as sort_order").merge(goal.event_query.call).group("#{Lookout.event.table_name}.name")
    selects << ["SELECT unique_visits, name, total_events, sort_order from #{goal.id}"]
    map[goal.id] = goal
    last_goal = goal
  end

  # activerecord quirk / with bug
  select = selects.join(" UNION ").delete_suffix(" from #{last_goal.id}")
  select = select.delete_prefix("SELECT ")
  steps = ::Ahoy::Event.with(
    queries,
    ).select(select).from("#{last_goal.id}").order("sort_order asc")

  # Cast to numeric/real for division depending on database
  cast_type = Lookout::DatabaseAdapter.postgresql? ? "::numeric" : ""
  cast_division = Lookout::DatabaseAdapter.postgresql? ? 
    "total_events::numeric/lag(total_events, 1) over ()" :
    "CAST(total_events AS REAL)/lag(total_events, 1) over ()"
  
  items = ::Ahoy::Event.with(steps: steps).select("total_events, unique_visits, name, round((#{cast_division}),2) as drop_off").from("steps").order("sort_order asc").index_by(&:name)
  items.delete("_internal_total_visits_")
  @steps = []

  items.values.each do |item|
    if map[item.name]
      item.name = map[item.name].title
    end
  end

  @steps = items.values
  self
end

#to_json ⇒ Object 



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# File 'app/presenters/lookout/funnel_presenter.rb', line 71

def to_json
  as_json.to_json
end

#total ⇒ Object 



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# File 'app/presenters/lookout/funnel_presenter.rb', line 60

def total
  @event_query.distinct(:visitor_token).count
end