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Class: ActiveRecord::Associations::Preloader::ThroughAssociation

Do not use. This class is for internal use only.
Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Association
Instance Chain:
self, Association
Inherits: ActiveRecord::Associations::Preloader::Association
Defined in: activerecord/lib/active_record/associations/preloader/through_association.rb

Class Method Summary

Association - Inherited

.new

Instance Attribute Summary

Association - Inherited

#klass, #run?, #key_conversion_required?, #model, #owners, #preload_scope, #reflection

Instance Method Summary

Association - Inherited

#associate_records_from_unscoped,
#association_key_name

The name of the key on the associated records.
#future_classes, #load_records, #loaded?, #loader_query, #owners_by_key, #preloaded_records, #records_by_owner, #run, #runnable_loaders, #scope, #set_inverse, #table_name, #target_for, #associate_records_to_owner, #association_key_type, #build_scope, #cascade_strict_loading, #convert_key, #derive_key,
#owner_key_name

The name of the key on the model which declares the association.
#owner_key_type, #reflection_scope

Constructor Details

This class inherits a constructor from ActiveRecord::Associations::Preloader::Association

Instance Attribute Details

#data_available? ⇒ Boolean (readonly, private)

[ GitHub ] 

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 65



def data_available?
  owners.all? { |owner| loaded?(owner) } ||
    through_preloaders.all?(&:run?) && source_preloaders.all?(&:run?)
end


  







Instance Method Details



  

    #future_classes  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 49



def future_classes
  if run?
    []
  elsif through_preloaders.all?(&:run?)
    source_preloaders.flat_map(&:future_classes).uniq
  else
    through_classes = through_preloaders.flat_map(&:future_classes)
    source_classes = source_reflection.
      chain.
      reject { |reflection| reflection.respond_to?(:polymorphic?) && reflection.polymorphic? }.
      map(&:klass)
    (through_classes + source_classes).uniq
  end
end


  








  

    #middle_records   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 74



def middle_records
  through_records_by_owner.values.flatten
end


  








  

    #preload_index   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 98



def preload_index
  @preload_index ||= preloaded_records.each_with_object({}).with_index do |(record, result), index|
    result[record] = index
  end
end


  








  

    #preloaded_records  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 7



def preloaded_records
  @preloaded_records ||= source_preloaders.flat_map(&:preloaded_records)
end


  








  

    #records_by_owner  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 11



def records_by_owner
  @records_by_owner ||= owners.each_with_object({}) do |owner, result|
    if loaded?(owner)
      result[owner] = target_for(owner)
      next
    end

    through_records = through_records_by_owner[owner] || []

    if owners.first.association(through_reflection.name).loaded?
      if source_type = reflection.options[:source_type]
        through_records = through_records.select do |record|
          record[reflection.foreign_type] == source_type
        end
      end
    end

    records = through_records.flat_map do |record|
      source_records_by_owner[record]
    end

    records.compact!
    records.sort_by! { |rhs| preload_index[rhs] } if scope.order_values.any?
    records.uniq! if scope.distinct_value
    result[owner] = records
  end
end


  








  

    #runnable_loaders  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 39



def runnable_loaders
  if data_available?
    [self]
  elsif through_preloaders.all?(&:run?)
    source_preloaders.flat_map(&:runnable_loaders)
  else
    through_preloaders.flat_map(&:runnable_loaders)
  end
end


  








  

    #source_preloaders   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 70



def source_preloaders
  @source_preloaders ||= ActiveRecord::Associations::Preloader.new(records: middle_records, associations: source_reflection.name, scope: scope, associate_by_default: false).loaders
end


  








  

    #source_records_by_owner   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 90



def source_records_by_owner
  @source_records_by_owner ||= source_preloaders.map(&:records_by_owner).reduce(:merge)
end


  








  

    #source_reflection   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 86



def source_reflection
  reflection.source_reflection
end


  








  

    #through_preloaders   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 78



def through_preloaders
  @through_preloaders ||= ActiveRecord::Associations::Preloader.new(records: owners, associations: through_reflection.name, scope: through_scope, associate_by_default: false).loaders
end


  








  

    #through_records_by_owner   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 94



def through_records_by_owner
  @through_records_by_owner ||= through_preloaders.map(&:records_by_owner).reduce(:merge)
end


  








  

    #through_reflection   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 82



def through_reflection
  reflection.through_reflection
end


  








  

    #through_scope   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/associations/preloader/through_association.rb', line 104



def through_scope
  scope = through_reflection.klass.unscoped
  options = reflection.options

  return scope if options[:disable_joins]

  values = reflection_scope.values
  if annotations = values[:annotate]
    scope.annotate!(*annotations)
  end

  if options[:source_type]
    scope.where! reflection.foreign_type => options[:source_type]
  elsif !reflection_scope.where_clause.empty?
    scope.where_clause = reflection_scope.where_clause

    if includes = values[:includes]
      scope.includes!(source_reflection.name => includes)
    else
      scope.includes!(source_reflection.name)
    end

    if values[:references] && !values[:references].empty?
      scope.references_values |= values[:references]
    else
      scope.references!(source_reflection.table_name)
    end

    if joins = values[:joins]
      scope.joins!(source_reflection.name => joins)
    end

    if left_outer_joins = values[:left_outer_joins]
      scope.left_outer_joins!(source_reflection.name => left_outer_joins)
    end

    if scope.eager_loading? && order_values = values[:order]
      scope = scope.order(order_values)
    end
  end

  cascade_strict_loading(scope)
end