Module: Transfer::Associations

Included in:
Plate, Tube
Defined in:
app/models/transfer/associations.rb

Overview

Include in assets that can act as sources/destinations for transfers

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 


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# File 'app/models/transfer/associations.rb', line 5

def self.included(base)
  base.class_eval do
    include Transfer::State

    has_many :transfers_as_source,
             -> { order(created_at: :asc) },
             class_name: 'Transfer',
             foreign_key: :source_id,
             inverse_of: :source

    has_many :transfers_to_tubes,
             -> { order(created_at: :asc) },
             class_name: 'Transfer::BetweenPlateAndTubes',
             foreign_key: :source_id,
             inverse_of: :source

    has_many :transfers_as_destination,
             -> { order(id: :asc) },
             class_name: 'Transfer',
             foreign_key: :destination_id,
             inverse_of: :destination

    # This looks odd but it's a LEFT OUTER JOIN, meaning that the rows we would be interested in have no source_id.
    scope :with_no_outgoing_transfers, lambda {
      select("DISTINCT #{base.quoted_table_name}.*")
        .joins("LEFT OUTER JOIN `transfers` outgoing_transfers ON outgoing_transfers.`source_id`=#{base.quoted_table_name}.`id`")
        .where('outgoing_transfers.source_id IS NULL')
    }
  end
end