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Contents
module SlackRubyBotServer
module Api
module Helpers
module CursorHelpers
extend ActiveSupport::Concern
# apply cursor-based pagination to a collection
# returns a hash:
# results: (paginated collection subset)
# next: (cursor to the next page)
def paginate_by_cursor(coll, &_block)
raise 'Both cursor and offset parameters are present, these are mutually exclusive.' if params.key?(:offset) && params.key?(:cursor)
results = { results: [], next: nil }
size = (params[:size] || 10).to_i
if params.key?(:offset)
skip = params[:offset].to_i
coll = coll.skip(skip)
end
# some items may be skipped with a block
query = block_given? ? coll : coll.limit(size)
query.scroll(params[:cursor]) do |record, next_cursor|
record = yield(record) if block_given?
results[:results] << record if record
results[:next] = next_cursor.to_s
break if results[:results].count >= size
end
results[:total_count] = coll.count if params[:total_count] && coll.respond_to?(:count)
results
end
def paginate_and_sort_by_cursor(coll, options = {}, &block)
Hashie::Mash.new(paginate_by_cursor(sort(coll, options), &block))
end
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems