has_many through additional (default) attribute values for through record on adding

[Nazar Matus]

For example, I have a User, Achievement and AchievementDate.

class User < ApplicationRecord
  has_many :achievement_dates
  has_many :achievements, through: :achievement_dates
end

And when I write add an achievement like this:

user.achievements << achievement

I want through record to be initialized with current date. So I want something like this:

class User < ApplicationRecord
  has_many :achievement_dates
  has_many :achievements, through: :achievement_dates, initialize_with: :method_name

  private

  def method_name(achievement_date)
    achievement_date.date = Date.current
  end
end

Currently I could not find a good way to achieve such behavior in Rails 5.0.0.1, so please, give me some advice or feedback.

[T.J. Schuck]

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