OpenProject is the leading open source project management software.
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openproject/lib/api/utilities/page_size_helper.rb

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#-- encoding: UTF-8
#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2021 the OpenProject GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2013 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# See docs/COPYRIGHT.rdoc for more details.
#++
module API
module Utilities
module PageSizeHelper
# Set a default max size to ensure backwards compatibility
# with the previous private setting `maximum_page_size`.
# The actual value is taken from
# max(Setting.per_page_options)
DEFAULT_API_MAX_SIZE ||= 500
##
# Determine set page_size from string
def resolve_page_size(string)
resolved_value = to_i_or_nil(string)
# a page size of 0 is a magic number for the maximum page size value
if resolved_value == 0 || resolved_value.to_i > maximum_page_size
resolved_value = maximum_page_size
end
resolved_value
end
##
# Determine the page size from the minimum of
# * the provided value
# * the page size specified for the relation (per_page)
# * the minimum of the per page options specified in the settings
# * the maximum page size
def resulting_page_size(value, relation = nil)
[value || relation&.base_class&.per_page || Setting.per_page_options_array.min, maximum_page_size]
.map(&:to_i)
.min
end
##
# Get the maximum allowed page size from
# the largest option of per_page size,
# or the magic fallback value 500.
def maximum_page_size
[
DEFAULT_API_MAX_SIZE,
Setting.per_page_options_array.max
].max
end
private
def to_i_or_nil(string)
string ? string.to_i : nil
end
end
end
end