Class: Torque::PostgreSQL::Associations::BelongsToManyAssociation

Inherits:
ActiveRecord::Associations::CollectionAssociation
  • Object
show all
Includes:
ActiveRecord::Associations::ForeignAssociation
Defined in:
lib/torque/postgresql/associations/belongs_to_many_association.rb

Instance Method Summary collapse

Instance Method Details

#build_changes(from_target = false) ⇒ Object 



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# File 'lib/torque/postgresql/associations/belongs_to_many_association.rb', line 64

def build_changes(from_target = false)
  return yield if defined?(@_building_changes) && @_building_changes

  @_building_changes = true
  yield.tap { ids_writer(from_target ? ids_reader : stale_state) }
ensure
  @_building_changes = nil
end

#default(&block) ⇒ Object

BELONGS TO



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# File 'lib/torque/postgresql/associations/belongs_to_many_association.rb', line 144

def default(&block)
  writer(owner.instance_exec(&block)) if reader.nil?
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/torque/postgresql/associations/belongs_to_many_association.rb', line 42

def empty?
  size.zero?
end

#handle_dependency ⇒ Object

HAS MANY



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# File 'lib/torque/postgresql/associations/belongs_to_many_association.rb', line 95

def handle_dependency
  case options[:dependent]
  when :restrict_with_exception
    raise ActiveRecord::DeleteRestrictionError.new(reflection.name) unless empty?

  when :restrict_with_error
    unless empty?
      record = owner.class.human_attribute_name(reflection.name).downcase
      owner.errors.add(:base, :'restrict_dependent_destroy.has_many', record: record)
      throw(:abort)
    end

  when :destroy
    load_target.each { |t| t.destroyed_by_association = reflection }
    destroy_all
  when :destroy_async
    load_target.each do |t|
      t.destroyed_by_association = reflection
    end

    unless target.empty?
      association_class = target.first.class
      primary_key_column = association_class.primary_key.to_sym

      ids = target.collect do |assoc|
        assoc.public_send(primary_key_column)
      end

      enqueue_destroy_association(
        owner_model_name: owner.class.to_s,
        owner_id: owner.id,
        association_class: association_class.to_s,
        association_ids: ids,
        association_primary_key_column: primary_key_column,
        ensuring_owner_was_method: options.fetch(:ensuring_owner_was, nil)
      )
    end
  else
    delete_all
  end
end

#ids_reader ⇒ Object

CUSTOM



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# File 'lib/torque/postgresql/associations/belongs_to_many_association.rb', line 13

def ids_reader
  if loaded?
    target.pluck(reflection.active_record_primary_key)
  elsif !target.empty?
    load_target.pluck(reflection.active_record_primary_key)
  else
    stale_state || column_default_value
  end
end

#ids_writer(ids) ⇒ Object 



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# File 'lib/torque/postgresql/associations/belongs_to_many_association.rb', line 23

def ids_writer(ids)
  ids = ids.presence || column_default_value
  owner.write_attribute(source_attr, ids)
  return unless owner.persisted? && owner.attribute_changed?(source_attr)

  owner.update_attribute(source_attr, ids)
end

#include?(record) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/torque/postgresql/associations/belongs_to_many_association.rb', line 46

def include?(record)
  return false unless record.is_a?(reflection.klass)
  return include_in_memory?(record) if record.new_record?

  (!target.empty? && target.include?(record)) ||
    stale_state&.include?(record.read_attribute(klass_attr))
end

#insert_record(record) ⇒ Object 



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# File 'lib/torque/postgresql/associations/belongs_to_many_association.rb', line 137

def insert_record(record, *)
  (record.persisted? || super).tap do |saved|
    ids_rewriter(record.read_attribute(klass_attr), :<<) if saved
  end
end

#load_target ⇒ Object 



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# File 'lib/torque/postgresql/associations/belongs_to_many_association.rb', line 54

def load_target
  if stale_target? || find_target?
    persisted_records = (find_target || []) + target.extract!(&:persisted?)
    @target = merge_target_lists(persisted_records, target)
  end

  loaded!
  target
end

#size ⇒ Object 



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# File 'lib/torque/postgresql/associations/belongs_to_many_association.rb', line 31

def size
  if loaded?
    target.size
  elsif !target.empty?
    unsaved_records = target.select(&:new_record?)
    unsaved_records.size + stale_state.size
  else
    stale_state&.size || 0
  end
end

#trigger(prefix, before_ids, after_ids) ⇒ Object 



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# File 'lib/torque/postgresql/associations/belongs_to_many_association.rb', line 73

def trigger(prefix, before_ids, after_ids)
  removed_ids = before_ids - after_ids
  added_ids = after_ids - before_ids

  if removed_ids.any?
    callbacks_for(method = :"#{prefix}_remove").each do |callback|
      target_scope.find(removed_ids).each do |record|
        callback.call(method, owner, record)
      end
    end
  end

  if added_ids.any?
    callbacks_for(method = :"#{prefix}_add").each do |callback|
      target_scope.find(added_ids).each do |record|
        callback.call(method, owner, record)
      end
    end
  end
end