Class: BrainzLab::Rails::Analyzers::NPlusOneDetector

Inherits:
Object
  • Object
show all
Defined in:
lib/brainzlab/rails/analyzers/n_plus_one_detector.rb

Overview

Detects N+1 query patterns by tracking similar queries within a request

Constant Summary collapse

THRESHOLD =

Minimum repeated queries to flag as N+1

3

Instance Method Summary collapse

Constructor Details

#initialize ⇒ NPlusOneDetector

Returns a new instance of NPlusOneDetector.



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# File 'lib/brainzlab/rails/analyzers/n_plus_one_detector.rb', line 10

def initialize
  @query_tracker = {}
  @request_id = nil
end

Instance Method Details

#check(sql, name, unique_id) ⇒ Object 



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# File 'lib/brainzlab/rails/analyzers/n_plus_one_detector.rb', line 15

def check(sql, name, unique_id)
  # Reset tracker on new request
  reset_if_new_request(unique_id)

  # Skip non-SELECT queries
  return nil unless sql.to_s.strip.upcase.start_with?('SELECT')

  # Skip SCHEMA queries
  return nil if name == 'SCHEMA'

  # Normalize query for comparison (remove specific values)
  normalized = normalize_query(sql)

  # Track query occurrences
  @query_tracker[normalized] ||= { count: 0, first_seen: Time.now, sql: sql }
  @query_tracker[normalized][:count] += 1

  # Check if threshold exceeded
  count = @query_tracker[normalized][:count]
  if count == THRESHOLD
    {
      query: truncate_sql(sql),
      normalized: normalized,
      count: count,
      model: extract_model_from_query(sql),
      location: extract_caller_location
    }
  else
    nil
  end
end