Class: RailsConsolePro::Services::StatsCalculator

Inherits:
Object
  • Object
show all
Defined in:
lib/rails_console_pro/services/stats_calculator.rb

Overview

Service for calculating model growth rate statistics

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model_class, safe_count_proc) ⇒ StatsCalculator

Returns a new instance of StatsCalculator.



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# File 'lib/rails_console_pro/services/stats_calculator.rb', line 11

def initialize(model_class, safe_count_proc)
  @model_class = model_class
  @safe_count = safe_count_proc
end

Class Method Details

.calculate_growth_rate(model_class, safe_count_proc) ⇒ Object 



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# File 'lib/rails_console_pro/services/stats_calculator.rb', line 7

def self.calculate_growth_rate(model_class, safe_count_proc)
  new(model_class, safe_count_proc).calculate_growth_rate
end

Instance Method Details

#calculate_growth_rate ⇒ Object 



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# File 'lib/rails_console_pro/services/stats_calculator.rb', line 16

def calculate_growth_rate
  # Double-check created_at exists (defensive programming)
  return nil unless ModelValidator.has_timestamp_column?(@model_class)
  return nil unless ModelValidator.has_table?(@model_class)

  begin
    # Get count from 1 hour ago
    one_hour_ago = 1.hour.ago
    old_count = @model_class.where('created_at < ?', one_hour_ago).count
    return nil if old_count == 0

    current_count = @safe_count.call
    return nil if current_count == old_count || current_count == 0

    # Calculate percentage change
    ((current_count - old_count).to_f / old_count * 100).round(2)
  rescue => e
    # Silently fail - growth rate is optional
    nil
  end
end