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module Grape
module Pagination
def self.included(base)
Grape::Endpoint.class_eval do
def paginate(collection)
per_page = ApiPagination.config.per_page_param(params) || route_setting(:per_page)
options = {
:page => ApiPagination.config.page_param(params),
:per_page => [per_page, route_setting(:max_per_page)].compact.min
}
collection, pagy = ApiPagination.paginate(collection, options)
links = (header['Link'] || "").split(',').map(&:strip)
url = request.url.sub(/\?.*$/, '')
pages = ApiPagination.pages_from(pagy || collection, options)
pages.each do |k, v|
old_params = Rack::Utils.parse_nested_query(request.query_string)
new_params = old_params.merge('page' => v)
links << %(<#{url}?#{new_params.to_param}>; rel="#{k}")
end
total_header = ApiPagination.config.total_header
per_page_header = ApiPagination.config.per_page_header
page_header = ApiPagination.config.page_header
include_total = ApiPagination.config.include_total
header 'Link', links.join(', ') unless links.empty?
header total_header, ApiPagination.total_from(pagy || collection).to_s if include_total
header per_page_header, options[:per_page].to_s
header page_header, options[:page].to_s unless page_header.nil?
return collection
end
end
base.class_eval do
def self.paginate(options = {})
route_setting :per_page, options[:per_page]
route_setting :max_per_page, options[:max_per_page]
enforce_max_per_page = options[:max_per_page] && options[:enforce_max_per_page]
per_page_values = enforce_max_per_page ? 0..options[:max_per_page] : nil
params do
optional :page, :type => Integer, :default => 1,
:desc => 'Page of results to fetch.'
optional :per_page, :type => Integer, :default => options[:per_page],
:desc => 'Number of results to return per page.',
:values => per_page_values
end
end
end
end
end
end
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