module ActiveRecord::Precount::JoinDependencyExtension

Public Instance Methods

aliases() click to toggle source
# File lib/active_record/precount/join_dependency_extension.rb, line 10
def aliases
  Associations::JoinDependency::Aliases.new join_root.each_with_index.map { |join_part,i|
    if join_part.is_a?(Associations::JoinDependency::JoinAssociation) && join_part.reflection.macro == :count_loader
      # select COUNT(primary_key)
      column_name = join_part.reflection.klass.primary_key
      column = Associations::JoinDependency::Aliases::Column.new column_name, "t#{i}_r0"
      CountTable.new(join_part, [column])
    else
      # original aliases' internal function
      columns = join_part.column_names.each_with_index.map { |column_name,j|
        Associations::JoinDependency::Aliases::Column.new column_name, "t#{i}_r#{j}"
      }
      Associations::JoinDependency::Aliases::Table.new(join_part, columns)
    end
  }
end

Private Instance Methods

construct(ar_parent, parent, row, rs, seen, model_cache, aliases) click to toggle source

instantiate only count_loader and pass others to super

Calls superclass method
# File lib/active_record/precount/join_dependency_extension.rb, line 30
def construct(ar_parent, parent, row, rs, seen, model_cache, aliases)
  normal_children = []

  parent.children.each do |node|
    if node.reflection.macro != :count_loader
      normal_children << node
      next
    end

    key = aliases.column_alias(node, node.primary_key)
    ar_parent.association(node.reflection.name).target = row[key].to_i
  end
  return if normal_children.blank?

  normal_parent = Associations::JoinDependency::JoinBase.new(parent.base_klass, normal_children)
  super
end