Class: Bullet::Detector::NPlusOneQuery

Inherits:
Association show all
Extended by:
Bullet::Dependency, StackTraceFilter
Defined in:
lib/bullet/detector/n_plus_one_query.rb

Constant Summary

Constants included from StackTraceFilter

StackTraceFilter::VENDOR_PATH

Class Method Summary collapse

Methods included from Bullet::Dependency

active_record40?, active_record41?, active_record42?, active_record4?, active_record50?, active_record51?, active_record52?, active_record5?, active_record60?, active_record61?, active_record6?, active_record70?, active_record71?, active_record72?, active_record7?, active_record80?, active_record8?, active_record?, active_record_version, mongoid4x?, mongoid5x?, mongoid6x?, mongoid7x?, mongoid8x?, mongoid?, mongoid_version

Methods included from StackTraceFilter

caller_in_project, excluded_stacktrace_path?

Methods inherited from Association

add_call_object_associations, add_object_associations, impossible_objects, possible_objects

Class Method Details

.add_impossible_object(object) ⇒ Object 



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# File 'lib/bullet/detector/n_plus_one_query.rb', line 58

def add_impossible_object(object)
  return unless Bullet.start?
  return unless Bullet.n_plus_one_query_enable?
  return unless object.bullet_primary_key_value

  Bullet.debug('Detector::NPlusOneQuery#add_impossible_object', "object: #{object.bullet_key}")
  impossible_objects.add object.bullet_key
end

.add_inversed_object(object, association) ⇒ Object 



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# File 'lib/bullet/detector/n_plus_one_query.rb', line 67

def add_inversed_object(object, association)
  return unless Bullet.start?
  return unless Bullet.n_plus_one_query_enable?
  return unless object.bullet_primary_key_value

  Bullet.debug(
    'Detector::NPlusOneQuery#add_inversed_object',
    "object: #{object.bullet_key}, association: #{association}"
  )
  inversed_objects.add object.bullet_key, association
end

.add_possible_objects(object_or_objects) ⇒ Object 



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# File 'lib/bullet/detector/n_plus_one_query.rb', line 34

def add_possible_objects(object_or_objects)
  return unless Bullet.start?
  return unless Bullet.n_plus_one_query_enable?

  objects = Array.wrap(object_or_objects)
  class_names_match_regex = true
  primary_key_values_are_empty = true

  keys_joined = objects.map do |obj|
    unless obj.class.name =~ /^HABTM_/
      class_names_match_regex = false
    end
    unless obj.bullet_primary_key_value.nil?
      primary_key_values_are_empty = false
    end
    obj.bullet_key
  end.join(", ")

  unless class_names_match_regex || primary_key_values_are_empty
    Bullet.debug('Detector::NPlusOneQuery#add_possible_objects', "objects: #{keys_joined}")
    objects.each { |object| possible_objects.add object.bullet_key }
  end
end

.association?(object, associations) ⇒ Boolean

check if object => associations already exists in object_associations.

Returns:

  • (Boolean) 


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# File 'lib/bullet/detector/n_plus_one_query.rb', line 93

def association?(object, associations)
  value = object_associations[object.bullet_key]
  value&.each do |v|
    # associations == v comparison order is important here because
    # v variable might be a squeel node where :== method is redefined,
    # so it does not compare values at all and return unexpected results
    result = v.is_a?(Hash) ? v.key?(associations) : associations == v
    return true if result
  end

  false
end

.call_association(object, associations) ⇒ Object

executed when object.associations is called. first, it keeps this method call for object.association. then, it checks if this associations call is unpreload.

if it is, keeps this unpreload associations and caller.



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# File 'lib/bullet/detector/n_plus_one_query.rb', line 16

def call_association(object, associations)
  return unless Bullet.start?
  return unless Bullet.n_plus_one_query_enable?
  return unless object.bullet_primary_key_value
  return if inversed_objects.include?(object.bullet_key, associations)

  add_call_object_associations(object, associations)

  Bullet.debug(
    'Detector::NPlusOneQuery#call_association',
    "object: #{object.bullet_key}, associations: #{associations}"
  )
  if !excluded_stacktrace_path? && conditions_met?(object, associations)
    Bullet.debug('detect n + 1 query', "object: #{object.bullet_key}, associations: #{associations}")
    create_notification(caller_in_project(object.bullet_key), object.class.to_s, associations)
  end
end

.conditions_met?(object, associations) ⇒ Boolean

decide whether the object.associations is unpreloaded or not.

Returns:

  • (Boolean) 


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# File 'lib/bullet/detector/n_plus_one_query.rb', line 80

def conditions_met?(object, associations)
  possible?(object) && !impossible?(object) && !association?(object, associations)
end

.impossible?(object) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bullet/detector/n_plus_one_query.rb', line 88

def impossible?(object)
  impossible_objects.include? object.bullet_key
end

.possible?(object) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bullet/detector/n_plus_one_query.rb', line 84

def possible?(object)
  possible_objects.include? object.bullet_key
end