Module: ActiveRecord::Precount::JoinDependencyExtension

Defined in:
lib/active_record/precount/join_dependency_extension.rb

Defined Under Namespace

Classes: CountTable

Instance Method Summary collapse

Instance Method Details

#aliases ⇒ Object 



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# 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