RUBYCRITIC
RUBYCRITIC
class ApiPaginationLinksPresenter - ApiPaginationLinksPresenter has no descriptive comment
include Rails.application.routes.url_helpers
# results should be a Browseable::Search instance that
# exposes the attributes delegated to it below
def initialize(results, params)
@results, @params = results, params
end
def serialize
{
first: first_url,
last: last_url,
next: next_url,
prev: prev_url
}
end
private
attr_reader :results, :params
delegate :total_pages, :first_page?, :second_page?, :last_page?, to: :results
# Sense check that the current page cannot be greater than the total number of pages
def current_page
[results.current_page, results.total_pages].min
end
def first_url
url_for url_params
end
def last_url
# If there are no results then the first_page == last_page
if total_pages == 1
first_url
else
url_for url_params.merge(page: total_pages)
end
end
def next_url
unless results.last_page?
url_for url_params.merge(page: current_page + 1)
else
nil
end
end
def prev_url
# first page of results does not need the :page param to improve caching
return first_url if second_page?
# use the last_url if we have paged off the end of the results
return last_url if results.current_page > total_pages
# only supply a link if there is a page of results before the current_page
if current_page > 1
url_for url_params.merge(page: current_page - 1)
else
nil
end
end
def url_params
params.slice(*api_links_allowed_components)
end
def api_links_allowed_components
[:protocol, :host, :port, :controller, :action, :q, :count, :state, :format]
end
end