class DataTables::Modules::Order

Attributes

context[R]
scope[R]

Public Class Methods

new(model, scope, params) click to toggle source
# File lib/data_tables/modules/order.rb, line 7
def initialize(model, scope, params)
  @scope = scope.dup
  @model = model
  @params = params
end

Public Instance Methods

build_order(model, in_hash, join_hash = nil) click to toggle source
# File lib/data_tables/modules/order.rb, line 25
def build_order(model, in_hash, join_hash = nil)
  # Tuple!
  return in_hash.inject([]) { |sum, (k, h)|
    case h
    when Hash
      if (klass = model.reflect_on_association(k).try(:klass))

        new_sum, join_class = build_order(klass, h)

        join_hash = join_class.nil? ? [k] : {k => join_class}

        sum += new_sum
      else
        warn("trying to reflect on #{k} but #{model.class.name} has no such association.")
      end
    else
      sum << model.arel_table[k].send(h) if model.column_names.include?(k.to_s)
    end
    sum
  }, join_hash
end
order() click to toggle source
# File lib/data_tables/modules/order.rb, line 13
def order
  columns = orderable_columns(@params[:order], @params[:columns])

  orders = DataTables::Responder.flat_keys_to_nested columns

  order_by, join_hash = build_order(@model, orders)

  @scope = @scope.joins(join_hash)

  order_by.inject(@scope) { |r, o| r.order(o) }
end

Protected Instance Methods

orderable_columns(orders, columns) click to toggle source
# File lib/data_tables/modules/order.rb, line 49
def orderable_columns(orders, columns)
  orders&.inject({}) do |collection, order|
    column = columns[order[:column]]
    if (column[:orderable] && column[:data].present?)
      collection[column[:data]] = order[:dir]
    end
    collection
  end
end