Module: ActiveRecord::QueryMethods

Defined in:
ext/active_record/base.rb

Instance Method Summary collapse

Instance Method Details

#random_sort ⇒ Object 



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# File 'ext/active_record/base.rb', line 42

def random_sort
  self.order(Arel::Nodes::RandomOrdering.new)
end

#sort(*ordering) ⇒ Object

ordering: :id :name, :id :id => :desc :id => => :nulls_last :listings => :id :listings => => {:asc => :nulls_first} :random



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# File 'ext/active_record/base.rb', line 16

def sort(*ordering)
  resource = all
  ordering.compact!
  ordering.flatten!
  return resource if ordering.size == 0
  
  ordering.each do |order|
    order = Array(order)

    order.each do |column_or_relation, options|
      if column_or_relation.to_sym == :random
        resource = resource.random_sort
      elsif self.column_names.include?(column_or_relation.to_s)
        resource = resource.sort_for_column(column_or_relation, options)
      elsif reflect_on_association(column_or_relation.to_sym)
        resource = resource.select(resource.klass.arel_table[Arel::Nodes::SqlLiteral.new('*')])
        resource = resource.sort_for_relation(column_or_relation.to_sym, options)
      else
        raise ActiveRecord::StatementInvalid.new("Unkown column #{column_or_relation}")
      end
    end
  end

  resource
end

#sort_for_column(column, options) ⇒ Object 



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# File 'ext/active_record/base.rb', line 46

def sort_for_column(column, options)
  column = self.arel_table[column.to_s.underscore]
  direction = (options.is_a?(Hash) ? options.keys.first.to_sym : options.to_s.downcase.to_sym)

  nulls = (options.is_a?(Hash) ? options.values.first.to_sym : nil)
  if direction == :desc
    self.order(Arel::Nodes::Descending.new(column, nulls))
  elsif direction == :asc || direction == :''
    self.order(Arel::Nodes::Ascending.new(column, nulls))
  else
    raise ActiveRecord::StatementInvalid.new("Unkown ordering #{direction}")
  end
end

#sort_for_relation(relation, options) ⇒ Object 



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# File 'ext/active_record/base.rb', line 60

def sort_for_relation(relation, options)
  resource = self
  relation = reflect_on_association(relation)

  if relation.macro == :has_many
    options = [options] if !options.is_a?(Array)

    options.each do |order|
      order = Array(order)
      order.each do |column, options|
        column = relation.klass.arel_table[column]
        direction = (options.is_a?(Hash) ? options.keys.first.to_sym : options.to_s.downcase.to_sym)

        nulls = (options.is_a?(Hash) ? options.values.first.to_sym : nil)
        if direction == :desc
          # aggregation = Arel::Nodes::Max.new([column], "max_#{relation.name}_#{column.name}")
          # order = Arel::Nodes::Descending.new(Arel::Nodes::SqlLiteral.new("max_#{relation.name}_#{column.name}"), nulls)

          if relation.options[:through]
            resource = resource.joins(relation.options[:through] => relation.source_reflection_name)
          else
            resource = resource.joins(relation.name)
          end
          # resource = resource.select(aggregation)
          # resource = resource.order(order)
          resource = resource.order(Arel::Nodes::Descending.new(column, nulls))
        else
          # aggregation = Arel::Nodes::Min.new([column], "min_#{relation.name}_#{column.name}")
          order = Arel::Nodes::Ascending.new(Arel::Nodes::SqlLiteral.new("min_#{relation.name}_#{column.name}"), nulls)

          resource = resource.joins(relation.name)
          # resource = resource.select(aggregation)
          # resource = resource.order(order)
          resource = resource.order(Arel::Nodes::Ascending.new(column, nulls))
        end
      end
    end
  elsif relation.macro == :belongs_to || relation.macro == :has_one
    options = [options] if !options.is_a?(Array)

    options.each do |order|
      order = Array(order)
      order.each do |column, options|
        column = relation.klass.arel_table[column]
        direction = (options.is_a?(Hash) ? options.keys.first.to_sym : options.to_s.downcase.to_sym)

        nulls = (options.is_a?(Hash) ? options.values.first.to_sym : nil)
        if direction == :asc
          order = Arel::Nodes::Ascending.new(column, nulls)
        else
          order = Arel::Nodes::Descending.new(column, nulls)
        end

        resource = resource.joins(relation.name)
        resource = resource.order(order)
      end
    end
  end

  resource
end