Module: Whoosh::Paginate

Defined in:
lib/whoosh/paginate.rb

Class Method Summary collapse

Class Method Details

.cursor(collection, cursor: nil, limit: 20, column: :id) ⇒ Object 



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# File 'lib/whoosh/paginate.rb', line 29

def self.cursor(collection, cursor: nil, limit: 20, column: :id)
  limit = [limit.to_i, 1].max
  cursor_value = cursor ? Base64.urlsafe_decode64(cursor) : nil

  if collection.is_a?(Array)
    filtered = if cursor_value
      numeric = cursor_value =~ /\A\d+\z/
      collection.select do |item|
        val = item[column]
        numeric ? val.to_i > cursor_value.to_i : val.to_s > cursor_value
      end
    else
      collection
    end
    items = filtered.first(limit + 1)
  else
    # Sequel dataset
    filtered = cursor_value ? collection.where { |o| o.__send__(column) > cursor_value } : collection
    items = filtered.limit(limit + 1).all
  end

  has_more = items.size > limit
  data = has_more ? items.first(limit) : items

  next_cursor = if has_more && data.last
    val = data.last.is_a?(Hash) ? data.last[column] : data.last.send(column)
    Base64.urlsafe_encode64(val.to_s, padding: false)
  end

  {
    data: data,
    pagination: { next_cursor: next_cursor, has_more: has_more, limit: limit }
  }
end

.offset(collection, page:, per_page:) ⇒ Object 



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# File 'lib/whoosh/paginate.rb', line 8

def self.offset(collection, page:, per_page:)
  page = [page.to_i, 1].max
  per_page = [per_page.to_i, 1].max

  if collection.is_a?(Array)
    total = collection.size
    data = collection.slice((page - 1) * per_page, per_page) || []
  else
    # Sequel dataset
    total = collection.count
    data = collection.limit(per_page).offset((page - 1) * per_page).all
  end

  total_pages = (total.to_f / per_page).ceil

  {
    data: data,
    pagination: { page: page, per_page: per_page, total: total, total_pages: total_pages }
  }
end