Class: Lcms::Engine::Pagination

Inherits:
Object
  • Object
show all
Defined in:
app/entities/lcms/engine/pagination.rb

Constant Summary collapse

PARAMS_DEFAULT = 
{ page: 1, per_page: 20, order: :asc }.freeze

Instance Method Summary collapse

Constructor Details

#initialize(params) ⇒ Pagination

Returns a new instance of Pagination.



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# File 'app/entities/lcms/engine/pagination.rb', line 8

def initialize(params)
  @params = handle_params params
end

Instance Method Details

#params(strict: false) ⇒ Object 



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# File 'app/entities/lcms/engine/pagination.rb', line 12

def params(strict: false)
  @pagination_params ||= begin
    expected_params = @params.slice(*PARAMS_DEFAULT.keys).symbolize_keys
    pagination = PARAMS_DEFAULT.merge(expected_params)

    pagination[:page] = pagination[:page].to_i
    pagination[:per_page] = pagination[:per_page].to_i
    pagination[:order] = pagination[:order].to_sym

    raise StandardError unless pagination[:page].positive?
    raise StandardError unless pagination[:per_page].positive?
    raise StandardError unless %i(asc desc).include? pagination[:order]

    pagination
  end
  strict ? @pagination_params.slice(:page, :per_page) : @pagination_params
end

#serialize(resources, serializer) ⇒ Object 



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# File 'app/entities/lcms/engine/pagination.rb', line 30

def serialize(resources, serializer)
  options = { root: :results }
  options[:meta_key] = :pagination
  options[:pagination] = {
    total_pages: resources.total_pages,
    current_page: resources.current_page,
    per_page: resources.per_page,
    order: params[:order],
    total_hits: resources.total_entries
  }
  options[:each_serializer] = serializer
  ActiveModel::Serializer::CollectionSerializer.new(resources, options).as_json
end