Class: ActiveRecord::Associations::HasManyThroughAssociation

Inherits:
Object
  • Object
show all
Defined in:
lib/composite_primary_keys/associations/has_many_through_association.rb

Instance Method Summary collapse

Instance Method Details

#cpk_join_through_predicate(*records) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/has_many_through_association.rb', line 4

def cpk_join_through_predicate(*records)
  ensure_mutable

  ids = records.map do |record|
    source_reflection.association_primary_key(reflection.klass).map do |key|
      record.send(key)
    end
  end

  cpk_in_predicate(through_association.scope.klass.arel_table, source_reflection.foreign_key, ids)
end

#delete_records(records, method) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/has_many_through_association.rb', line 16

def delete_records(records, method)
  ensure_not_nested

  # This is unoptimised; it will load all the target records
  # even when we just want to delete everything.
  records = load_target if records == :all

  scope = through_association.scope

  # CPK
  # scope.where! construct_join_attributes(*records)
  if source_reflection.klass.composite?
    scope.where! cpk_join_through_predicate(*records)
  else
    scope.where! construct_join_attributes(*records)
  end

  case method
    when :destroy
      if scope.klass.primary_key
        count = scope.destroy_all.length
      else
        scope.to_a.each do |record|
          record.run_callbacks :destroy
        end

        arel = scope.arel

        stmt = Arel::DeleteManager.new arel.engine
        stmt.from scope.klass.arel_table
        stmt.wheres = arel.constraints

        count = scope.klass.connection.delete(stmt, 'SQL', scope.bind_values)
      end
    when :nullify
      count = scope.update_all(source_reflection.foreign_key => nil)
    else
      count = scope.delete_all
  end

  delete_through_records(records)

  if source_reflection.options[:counter_cache] && method != :destroy
    counter = source_reflection.counter_cache_column
    klass.decrement_counter counter, records.map(&:id)
  end

  if through_reflection.macro == :has_many && update_through_counter?(method)
    update_counter(-count, through_reflection)
  end

  update_counter(-count)
end

#through_records_for(record) ⇒ Object 



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# File 'lib/composite_primary_keys/associations/has_many_through_association.rb', line 70

def through_records_for(record)
  # CPK
  #attributes = construct_join_attributes(record)
  #candidates = Array.wrap(through_association.target)
  #candidates.find_all { |c| c.attributes.slice(*attributes.keys) == attributes }

  if record.composite?
    candidates = Array.wrap(through_association.target)
    candidates.find_all { |c| c.attributes.slice(*source_reflection.association_primary_key) == record.ids_hash }
  else
    attributes = construct_join_attributes(record)
    candidates = Array.wrap(through_association.target)
    candidates.find_all { |c| c.attributes.slice(*attributes.keys) == attributes }
  end
end