Module: AssociationSelection::V5::Preloader

Defined in:
lib/association_selection/v5/preloader.rb

Constant Summary collapse

NULL_RELATION = 
Struct.new(:values, :where_clause, :joins_values)
.new({}, ::ActiveRecord::Relation::WhereClause.empty, [])

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#assoc_select_fields ⇒ Object

Returns the value of attribute assoc_select_fields.



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# File 'lib/association_selection/v5/preloader.rb', line 6

def assoc_select_fields
  @assoc_select_fields
end

#relation_klass ⇒ Object

Returns the value of attribute relation_klass.



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# File 'lib/association_selection/v5/preloader.rb', line 6

def relation_klass
  @relation_klass
end

Instance Method Details

#preload(records, associations, preload_scope = nil) ⇒ Object 



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# File 'lib/association_selection/v5/preloader.rb', line 11

def preload(records, associations, preload_scope = nil)
  records       = Array.wrap(records).compact.uniq
  associations  = Array.wrap(associations)
  preload_scope ||= nil

  return [] if records.empty?

  any_specified_fields = relation_klass.present? && assoc_select_fields.is_a?(Hash)
  indexed_reflections = relation_klass.reflections.map { |k, r| [k, r.class_name] }.to_h if any_specified_fields
  associations.flat_map do |association|
    if any_specified_fields && indexed_reflections.key?(association.to_s)
      preloaders_on(
        association,
        records,
        indexed_reflections[association.to_s].constantize.select(assoc_select_fields[association])
      )
    else
      preloaders_on association, records, preload_scope
    end
  end
end