ensl.org/app/models/teamer.rb

class Teamer < ActiveRecord::Base
  include Extra

  RANK_REMOVED = -2
  RANK_JOINER = -1
  RANK_MEMBER = 0
  RANK_DEPUTEE = 1
  RANK_LEADER = 2

  attr_protected :id, :created_at, :updated_at, :version

  validates_length_of :comment, :in => 0..15, :allow_blank => true
  validates_uniqueness_of :user_id, :scope => [:team_id, :rank]
  validates_presence_of :user, :team
  #validate_on_create:validate_team
  #validate_on_create:validate_contests
  validate :validate_team

  scope :basic,
    :include => :user,
    :order => "rank DESC, created_at ASC"
  scope :past,
    :conditions => ["teamers.rank = ?", RANK_REMOVED]
  scope :joining,
    :conditions => ["teamers.rank = ?", RANK_JOINER]
  scope :present,
    :conditions => ["teamers.rank >= ?", RANK_JOINER]
  scope :active,
    :conditions => ["teamers.rank >= ?", RANK_MEMBER]
  scope :leaders,
    :conditions => ["teamers.rank >= ?", RANK_DEPUTEE]
  scope :of_team,
    lambda { |team| {:conditions => {"teamers.team_id" => team.id}} }
  scope :active_teams,
    :include => :team,
    :conditions => ["teams.active = ?", true]
  scope :distinct,
    :group => "user_id, team_id"
  scope :ordered,
    :order => "rank DESC, created_at ASC"
  scope :historic,
    lambda { |user, time|
    {:conditions => ["user_id = ? AND created_at < ? AND ((updated_at > ? AND rank = ?) OR rank >= ?)",
                     user.id, time.utc, time.utc, RANK_REMOVED, RANK_MEMBER]} }

    belongs_to :user
    belongs_to :team
    has_many :other_teamers, :through => :user, :source => :teamers, :conditions => ["teamers.id != ?", object_id]
    has_many :contesters, :through => :team

    before_create :init_variables

    def to_s
      user.to_s
    end

    def ranks
      {RANK_JOINER => "Joining", RANK_MEMBER => "Member", RANK_DEPUTEE => "Deputee", RANK_LEADER => "Leader"}
    end

    def validate_team
      if user.teamers.of_team(team).present.count > 0
        errors.add :team, I18n.t(:teams_join_twice)
      end
    end

    def validate_contests
      # TODO
    end

    def init_variables
      self.rank = RANK_JOINER unless self.rank
    end

    def destroy
      user.update_attribute :team, nil if user.team == team
      if rank == Teamer::RANK_JOINER
        super
      else
        update_attribute :rank, Teamer::RANK_REMOVED
      end
    end

    def can_create? cuser, params
      cuser and Verification.contain params, [:user_id, :team_id]
    end

    def can_update? cuser
      cuser and cuser.admin?
    end

    def can_destroy? cuser
      cuser and (user == cuser or team.is_leader? cuser or cuser.admin?)
    end
end