Module: ActiveItem::Pagination

Defined in:
lib/active_item/pagination.rb

Overview

Cursor-based pagination for in-memory arrays of ActiveItem records. Provides a paginate_array helper and a PaginatedResult wrapper.

Defined Under Namespace

Classes: PaginatedResult

Constant Summary collapse

DEFAULT_PER_PAGE = 
25
MAX_PER_PAGE = 
100

Class Method Summary collapse

Class Method Details

.paginate_array(items, cursor = nil, per_page: DEFAULT_PER_PAGE) ⇒ Object 



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# File 'lib/active_item/pagination.rb', line 10

def self.paginate_array(items, cursor = nil, per_page: DEFAULT_PER_PAGE)
  per_page = per_page.to_i.clamp(1, MAX_PER_PAGE)

  if cursor && !cursor.empty?
    cursor_time, cursor_id = cursor.split('|', 2)
    items = items.drop_while { |i| ([i.created_at || '', i.id] <=> [cursor_time, cursor_id]) >= 0 }
  end

  page_items = items.first(per_page)
  has_more = items.length > per_page
  last = page_items.last
  next_cursor = has_more && last ? "#{last.created_at}|#{last.id}" : nil

  PaginatedResult.new(items: page_items, next_cursor: next_cursor, per_page: per_page)
end