Self referencing model: how to join columns from join table in childrens as well

[Alexander Fitterling]

Dear everyone,

I'd like to ask two questions, how can I optimize my performance of my current model?

I'd like to use the information from translations table as it is (all columns) ....

 => Translation(id: integer, word_id: integer, conversion_id: integer, created_at: datetime, updated_at: datetime, user_id: string, unit_id: integer, last_learned: date, missed: integer, learned: integer) 

... and merge it to any translations/conversions children of Word.

My model getter self_with_translations should attach it to all translations/conversions but using join.

Second thing would be to optimize the check for in unit_ids section for only select unit_ids once and not have many selects.

The program is right here: http://open-voc.org

I appreciate any help,

kind regards, 

Alex

Code below:

class Word < ActiveRecord::Base

  has_and_belongs_to_many :conversions, class_name: "Word",

                          join_table: "translations",

                          association_foreign_key: "conversion_id"

  def available_units=(unit_ids_as_array)

    @available_units = unit_ids_as_array

  end

  def available_units

    @available_units || []

  end

  def with_enriched_data

    #@FIXME join merge instead of calling sep.

    meta = Translation.where(word_id: self.id).first

    # fix for deleted units, don't deliver them!

    self.available_units = Unit.all.map{|u| u.id } # @FIXME Cache or call only one time

    unit_id = meta.unit_id if self.available_units.include? meta.unit_id

    # enrich with attrs unit_id, ..........

    attributes.merge(unit_id:  unit_id, missed: meta.missed)

  end

  def self_with_translations(targetlang_id={})

    conversions = self.conversions.where(language_id: targetlang_id).map do |c|

      c.with_enriched_data

    end

    attributes.merge(translations: conversions)

  end

end