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paginated_collection.rb
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paginated_collection.rb
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# frozen_string_literal: true
module ActiveAdmin
module Views
# Wraps the content with pagination and available formats.
#
# *Example:*
#
# paginated_collection collection, entry_name: "Post" do
# div do
# h2 "Inside the
# end
# end
#
# This will create a div with a sentence describing the number of
# posts in one of the following formats:
#
# * "No Posts found"
# * "Showing all 10 Posts"
# * "Showing Posts 1 - 30 of 31 in total"
#
# It will also generate pagination links.
#
class PaginatedCollection < ActiveAdmin::Component
builder_method :paginated_collection
attr_reader :collection
# Builds a new paginated collection component
#
# collection => A paginated collection from kaminari
# options => These options will be passed to `page_entries_info`
# entry_name => The name to display for this resource collection
# params => Extra parameters for pagination (e.g. { anchor: 'details' })
# param_name => Parameter name for page number in the links (:page by default)
# download_links => Download links override (false or [:csv, :pdf])
#
def build(collection, options = {})
@collection = collection
@params = options.delete(:params)
@param_name = options.delete(:param_name)
@download_links = options.delete(:download_links)
@display_total = options.delete(:pagination_total) { true }
@per_page = options.delete(:per_page)
unless @collection.respond_to?(:total_pages)
raise(StandardError, "Collection is not a paginated scope. Set collection.page(params[:page]).per(10) before calling :paginated_collection.")
end
add_class "paginated-collection"
@contents = div(class: "paginated-collection-contents")
build_pagination_with_formats(options)
@built = true
end
# Override add_child to insert all children into the @contents div
def add_child(*args, &block)
if @built
@contents.add_child(*args, &block)
else
super
end
end
protected
def build_pagination_with_formats(options)
div class: "paginated-collection-pagination" do
div page_entries_info(options).html_safe, class: "pagination-information"
build_pagination
end
formats = build_download_formats @download_links
if @per_page.is_a?(Array) || formats.any?
div class: "paginated-collection-footer" do
build_per_page_select if @per_page.is_a?(Array)
render("active_admin/shared/download_format_links", formats: formats) if formats.any?
end
end
end
def build_per_page_select
div do
text_node I18n.t("active_admin.pagination.per_page")
select class: "pagination-per-page" do
@per_page.each do |per_page|
option(
per_page,
value: per_page,
selected: @collection.limit_value == per_page ? "selected" : nil
)
end
end
end
end
def build_pagination
options = { views_prefix: :active_admin, outer_window: 1, window: 2 }
options[:params] = @params if @params
options[:param_name] = @param_name if @param_name
if !@display_total
# The #paginate method in kaminari will query the resource with a
# count(*) to determine how many pages there should be unless
# you pass in the :total_pages option. We issue a query to determine
# if there is another page or not, but the limit/offset make this
# query fast.
offset = @collection.offset(@collection.current_page * @collection.limit_value).limit(1).count
options[:total_pages] = @collection.current_page + offset
options[:right] = 0
end
text_node paginate @collection, **options
end
# modified from will_paginate
def page_entries_info(options = {})
if options[:entry_name]
entry_name = options[:entry_name]
entries_name = options[:entries_name] || entry_name.pluralize
elsif collection_empty?(@collection)
entry_name = I18n.t "active_admin.pagination.entry", count: 1, default: "entry"
entries_name = I18n.t "active_admin.pagination.entry", count: 2, default: "entries"
else
key = "activerecord.models." + @collection.first.class.model_name.i18n_key.to_s
entry_name = I18n.translate key, count: 1, default: @collection.first.class.name.underscore.sub("_", " ")
entries_name = I18n.translate key, count: @collection.size, default: entry_name.pluralize
end
if @display_total
if @collection.total_pages < 2
case collection_size(@collection)
when 0; I18n.t("active_admin.pagination.empty", model: entries_name)
when 1; I18n.t("active_admin.pagination.one", model: entry_name)
else; I18n.t("active_admin.pagination.one_page", model: entries_name, n: @collection.total_count)
end
else
offset = (@collection.current_page - 1) * @collection.limit_value
total = @collection.total_count
I18n.t "active_admin.pagination.multiple",
model: entries_name,
total: total,
from: offset + 1,
to: offset + collection_size(@collection)
end
else
# Do not display total count, in order to prevent a `SELECT count(*)`.
# To do so we must not call `@collection.total_pages`
offset = (@collection.current_page - 1) * @collection.limit_value
I18n.t "active_admin.pagination.multiple_without_total",
model: entries_name,
from: offset + 1,
to: offset + collection_size(@collection)
end
end
end
end
end