CODEWITHSUNDEEP
ruby-on-railsactiverecord
secador de pelo
secador de pelo

Reputation: 709

Rails best way to access childs siblings in a parent-child relation

I have these models:

class Folder < ApplicationRecord
  has_many :files, -> { reorder_descending }, dependent: :destroy
  has_many :not_deleted_files, -> { not_deleted.reorder_descending }, class_name: 'File'
end


class File < ApplicationRecord
  belongs_to :folder

  scope :not_deleted, -> { where('deleted_at IS NULL ') }

  scope :reorder_ascending, -> { reorder('enactment_date ASC, finding_date ASC, id ASC') }
  scope :reorder_descending, -> { reorder('enactment_date DESC, finding_date DESC, id DESC') }

  def not_deleted_files
    folder.not_deleted_files
  end
end

Now i have a folder and I iterate over all it's files. In the File class I have a lot of methods that are using the not_deleted_files method. Every time this method is used, a new query is fired. Even though they all have the same parent (Folder).

Also the queries are cached, I think there should be a way to prevent them at all.

Upvotes: 0

Views: 267

Answers (1)

Gagan Gupta
Gagan Gupta

Reputation: 1227

You can use inverse_of as Rails can optimize object loading so parent_object and child_object.parent will reference the same object in memory, instead of loading another copy of the same record.

I am glad it helped. :)

Upvotes: 1

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