Validate and create or import multiple records in Rails

learner_collection.rb

# app/models/learner_collection.rb

class LearnerCollection
  include ActiveModel::Model

  attr_accessor :learners, :current_user

  def initialize(learners_attributes: [], **kw_args)
    super
  end

  def learners_attributes=(attrs)
    self.learners = attrs.map do |learner_attrs|
      learner = Learner.new(learner_attrs)
      learner.organization = current_user.find_organization
      learner
    end
  end

  def valid?
    errors.clear
    if learners.reject(&:valid?).any?
      learners.map do |u|
        errors.add(:base, u.errors.full_messages)
      end
    end
    errors.none?
  end

  def save!
    raise(ActiveRecord::RecordInvalid) && return unless valid?
    save_in_transaction
  end

  def save
    return false unless valid?

    save_in_transaction
  end

  def send_invites
    learners.map(&:send_invite)
  end

  private

  def save_in_transaction
    Learner.transaction do
      learners.reject(&:save!).none?
    end
  end
end

learners_controller.rb

#app/controllers/learners_controller.rb

class LearnersController < ApplicationController
  def create
    @collection = LearnerCollection.new(
      learners_attributes: learner_params.require(:learners),
      current_user: current_user
    )

    if @collection.save
      render json: @collection.learners, status: :created
    else
      render json: @collection.errors.full_messages, status: :unprocessable_entity
    end
  end
end