Class: ActiveRecord::Reflection::AssociationReflection

# File 'activerecord/lib/active_record/reflection.rb', line 696

def collection?
  false
end

# File 'activerecord/lib/active_record/reflection.rb', line 514

attr_reader :type, :foreign_type

# File 'activerecord/lib/active_record/reflection.rb', line 674

def has_inverse?
  inverse_name
end

# File 'activerecord/lib/active_record/reflection.rb', line 717

def has_one?; false; end

# File 'activerecord/lib/active_record/reflection.rb', line 670

def has_scope?
  scope
end

# File 'activerecord/lib/active_record/reflection.rb', line 666

def nested?
  false
end

# File 'activerecord/lib/active_record/reflection.rb', line 515

attr_accessor :parent_reflection # Reflection

# File 'activerecord/lib/active_record/reflection.rb', line 721

def polymorphic?
  options[:polymorphic]
end

# File 'activerecord/lib/active_record/reflection.rb', line 514

attr_reader :type, :foreign_type

# File 'activerecord/lib/active_record/reflection.rb', line 709

def validate?
  !options[:validate].nil? ? options[:validate] : (options[:autosave] == true || collection?)
end

# File 'activerecord/lib/active_record/reflection.rb', line 733

def add_as_polymorphic_through(reflection, seed)
  seed + [PolymorphicReflection.new(self, reflection)]
end

# File 'activerecord/lib/active_record/reflection.rb', line 729

def add_as_source(seed)
  seed
end

# File 'activerecord/lib/active_record/reflection.rb', line 737

def add_as_through(seed)
  seed + [self]
end

# File 'activerecord/lib/active_record/reflection.rb', line 719

def association_class; raise NotImplementedError; end

# File 'activerecord/lib/active_record/reflection.rb', line 579

def association_foreign_key
  @association_foreign_key ||= -(options[:association_foreign_key]&.to_s || class_name.foreign_key)
end

# File 'activerecord/lib/active_record/reflection.rb', line 583

def association_primary_key(klass = nil)
  primary_key(klass || self.klass)
end

# File 'activerecord/lib/active_record/reflection.rb', line 540

def association_scope_cache(klass, owner, &block)
  key = self
  if polymorphic?
    key = [key, owner._read_attribute(@foreign_type)]
  end
  klass.with_connection do |connection|
    klass.cached_find_by_statement(connection, key, &block)
  end
end

# File 'activerecord/lib/active_record/reflection.rb', line 758

def automatic_inverse_of
  if can_find_inverse_of_automatically?(self)
    inverse_name = ActiveSupport::Inflector.underscore(options[:as] || active_record.name.demodulize).to_sym

    begin
      reflection = klass._reflect_on_association(inverse_name)
      if !reflection && active_record.automatically_invert_plural_associations
        plural_inverse_name = ActiveSupport::Inflector.pluralize(inverse_name)
        reflection = klass._reflect_on_association(plural_inverse_name)
      end
    rescue NameError => error
      raise unless error.name.to_s == class_name

      # Give up: we couldn't compute the klass type so we won't be able
      # to find any associations either.
      reflection = false
    end

    if valid_inverse_reflection?(reflection)
      reflection.name
    end
  end
end

# File 'activerecord/lib/active_record/reflection.rb', line 800

def can_find_inverse_of_automatically?(reflection, inverse_reflection = false)
  reflection.options[:inverse_of] != false &&
    !reflection.options[:through] &&
    !reflection.options[:foreign_key] &&
    scope_allows_automatic_inverse_of?(reflection, inverse_reflection)
end

# File 'activerecord/lib/active_record/reflection.rb', line 630

def check_eager_loadable!
  return unless scope

  unless scope.arity == 0
    raise ArgumentError, <<-MSG.squish
      The association scope '#{name}' is instance dependent (the scope
      block takes an argument). Eager loading instance dependent scopes
      is not supported.
    MSG
  end
end

# File 'activerecord/lib/active_record/reflection.rb', line 618

def check_validity!
  check_validity_of_inverse!

  if !polymorphic? && (klass.composite_primary_key? || active_record.composite_primary_key?)
    if (has_one? || collection?) && Array(active_record_primary_key).length != Array(foreign_key).length
      raise CompositePrimaryKeyMismatchError.new(self)
    elsif belongs_to? && Array(association_primary_key).length != Array(foreign_key).length
      raise CompositePrimaryKeyMismatchError.new(self)
    end
  end
end

# File 'activerecord/lib/active_record/reflection.rb', line 662

def clear_association_scope_cache # :nodoc:
  klass.initialize_find_by_cache
end

# File 'activerecord/lib/active_record/reflection.rb', line 656

def collect_join_chain
  [self]
end

# File 'activerecord/lib/active_record/reflection.rb', line 490

def compute_class(name)
  if polymorphic?
    raise ArgumentError, "Polymorphic associations do not support computing the class."
  end

  begin
    klass = active_record.send(:compute_type, name)
  rescue NameError => error
    if error.name.match?(/(?:\A|::)#{name}\z/)
      message = "Missing model class #{name} for the #{active_record}##{self.name} association."
      message += " You can specify a different model class with the :class_name option." unless options[:class_name]
      raise NameError.new(message, name)
    else
      raise
    end
  end

  unless klass < ActiveRecord::Base
    raise ArgumentError, "The #{name} model class for the #{active_record}##{self.name} association is not an ActiveRecord::Base subclass."
  end

  klass
end

# File 'activerecord/lib/active_record/reflection.rb', line 821

def derive_class_name
  class_name = name.to_s
  class_name = class_name.singularize if collection?
  class_name.camelize
end

# File 'activerecord/lib/active_record/reflection.rb', line 839

def derive_fk_query_constraints(foreign_key)
  primary_query_constraints = active_record.query_constraints_list
  owner_pk = active_record.primary_key

  if primary_query_constraints.size > 2
    raise ArgumentError, <<~MSG.squish
      The query constraints list on the `#{active_record}` model has more than 2
      attributes. Active Record is unable to derive the query constraints
      for the association. You need to explicitly define the query constraints
      for this association.
    MSG
  end

  if !primary_query_constraints.include?(owner_pk)
    raise ArgumentError, <<~MSG.squish
      The query constraints on the `#{active_record}` model does not include the primary
      key so Active Record is unable to derive the foreign key constraints for
      the association. You need to explicitly define the query constraints for this
      association.
    MSG
  end

  return foreign_key if primary_query_constraints.include?(foreign_key)

  first_key, last_key = primary_query_constraints

  if first_key == owner_pk
    [foreign_key, last_key.to_s]
  elsif last_key == owner_pk
    [first_key.to_s, foreign_key]
  else
    raise ArgumentError, <<~MSG.squish
      Active Record couldn't correctly interpret the query constraints
      for the `#{active_record}` model. The query constraints on `#{active_record}` are
      `#{primary_query_constraints}` and the foreign key is `#{foreign_key}`.
      You need to explicitly set the query constraints for this association.
    MSG
  end
end

# File 'activerecord/lib/active_record/reflection.rb', line 827

def derive_foreign_key(infer_from_inverse_of: true)
  if belongs_to?
    "#{name}_id"
  elsif options[:as]
    "#{options[:as]}_id"
  elsif options[:inverse_of] && infer_from_inverse_of
    inverse_of.foreign_key(infer_from_inverse_of: false)
  else
    active_record.model_name.to_s.foreign_key
  end
end

# File 'activerecord/lib/active_record/reflection.rb', line 879

def derive_join_table
  ModelSchema.derive_join_table_name active_record.table_name, klass.table_name
end

# File 'activerecord/lib/active_record/reflection.rb', line 741

def extensions
  Array(options[:extend])
end

# File 'activerecord/lib/active_record/reflection.rb', line 554

def foreign_key(infer_from_inverse_of: true)
  @foreign_key ||= if options[:foreign_key]
    if options[:foreign_key].is_a?(Array)
      options[:foreign_key].map { |fk| -fk.to_s.freeze }.freeze
    else
      options[:foreign_key].to_s.freeze
    end
  elsif options[:query_constraints]
    options[:query_constraints].map { |fk| -fk.to_s.freeze }.freeze
  else
    derived_fk = derive_foreign_key(infer_from_inverse_of: infer_from_inverse_of)

    if active_record.has_query_constraints?
      derived_fk = derive_fk_query_constraints(derived_fk)
    end

    if derived_fk.is_a?(Array)
      derived_fk.map! { |fk| -fk.freeze }
      derived_fk.freeze
    else
      -derived_fk.freeze
    end
  end
end

# File 'activerecord/lib/active_record/reflection.rb', line 749

def inverse_name
  unless defined?(@inverse_name)
    @inverse_name = options.fetch(:inverse_of) { automatic_inverse_of }
  end

  @inverse_name
end

# File 'activerecord/lib/active_record/reflection.rb', line 614

def join_foreign_key
  active_record_primary_key
end

# File 'activerecord/lib/active_record/reflection.rb', line 642

def join_id_for(owner) # :nodoc:
  Array(join_foreign_key).map { |key| owner._read_attribute(key) }
end

# File 'activerecord/lib/active_record/reflection.rb', line 606

def join_primary_key(klass = nil)
  foreign_key
end

# File 'activerecord/lib/active_record/reflection.rb', line 610

def join_primary_type
  type
end

# File 'activerecord/lib/active_record/reflection.rb', line 550

def join_table
  @join_table ||= -(options[:join_table]&.to_s || derive_join_table)
end

# File 'activerecord/lib/active_record/reflection.rb', line 691

def macro; raise NotImplementedError; end

# File 'activerecord/lib/active_record/reflection.rb', line 678

def polymorphic_inverse_of(associated_class)
  if has_inverse?
    if inverse_relationship = associated_class._reflect_on_association(options[:inverse_of])
      inverse_relationship
    else
      raise InverseOfAssociationNotFoundError.new(self, associated_class)
    end
  end
end

# File 'activerecord/lib/active_record/reflection.rb', line 725

def polymorphic_name
  active_record.polymorphic_name
end

# File 'activerecord/lib/active_record/reflection.rb', line 813

def scope_allows_automatic_inverse_of?(reflection, inverse_reflection)
  if inverse_reflection
    !reflection.scope
  else
    !reflection.scope || reflection.klass.automatic_scope_inversing
  end
end

# File 'activerecord/lib/active_record/reflection.rb', line 650

def source_reflection
  self
end

# File 'activerecord/lib/active_record/reflection.rb', line 646

def through_reflection
  nil
end

# File 'activerecord/lib/active_record/reflection.rb', line 786

def valid_inverse_reflection?(reflection)
  reflection &&
    reflection != self &&
    foreign_key == reflection.foreign_key &&
    klass <= reflection.active_record &&
    can_find_inverse_of_automatically?(reflection, true)
end