educoder/app/models/project_package.rb

class ProjectPackage < ApplicationRecord
  include AASM

  belongs_to :creator, class_name: 'User'
  belongs_to :project_package_category

  has_many :project_package_applies, dependent: :destroy
  has_one :process_project_package_apply, -> { where(status: :pending) }, class_name: 'ProjectPackageApply'

  has_many :bidding_users, dependent: :delete_all
  has_many :win_bidding_users, -> { where(status: :bidding_won) }, class_name: 'BiddingUser'
  has_many :lose_bidding_users, -> { where(status: :bidding_lost) }, class_name: 'BiddingUser'

  has_many :attachments, as: :container, dependent: :destroy

  aasm(:status) do
    state :pending, initiali: true
    state :applying
    state :refused
    state :published
    state :bidding_ended
    state :bidding_finished

    event :apply do
      transitions from: [:pending, :refused], to: :applying
    end

    event :refuse do
      transitions from: :applying, to: :refused
    end

    event :publish do
      transitions from: :applying, to: :published
    end

    event :end_bidding do
      transitions from: :published, to: :bidding_ended
    end

    event :finish_bidding do
      transitions from: [:bidding_ended], to: :bidding_finished
    end
  end

  def category_name
    project_package_category.name
  end

  def visitable?
    !editable?
  end

  def editable?
    pending? || applying? || refused?
  end

  def deletable?
    pending? || refused?
  end

  def deadline?
    deadline_at < Time.now
  end

  def bidding_end?
    flag = deadline?
    end_bidding! if flag && may_end_bidding?
    flag
  end

  def can_bidding?(user)
    published? && !bidding_end? && user.id != creator_id && !bidding_users.exists?(user_id: user.id)
  end

  def status_text
    I18n.t("project_package.status.#{status}")
  end
end