pagination happening now

Gemfile

@@ -224,6 +224,9 @@ gem 'icalendar'
 # for making external requests easier
 gem 'httparty'
 
+#pagination
+gem 'pagy', '<4.0'
+
 # Use guard and spring for testing in development
 group :development do
   # to launch specs when files are modified

Gemfile.lock

@@ -364,6 +364,7 @@ GEM
       rack-openid (~> 1.3.1)
     open4 (1.3.4)
     orm_adapter (0.5.0)
+    pagy (3.12.0)
     paper_trail (10.3.1)
       activerecord (>= 4.2)
       request_store (~> 1.1)
@@ -735,6 +736,7 @@ DEPENDENCIES
   omniauth-github
   omniauth-google-oauth2
   omniauth-openid
+  pagy (< 4.0)
   paper_trail
   pdf-inspector
   pg

app/controllers/application_controller.rb

@@ -3,6 +3,7 @@
 class ApplicationController < ActionController::Base
   before_action :set_paper_trail_whodunnit
   include ApplicationHelper
+  include Pagy::Backend
   add_flash_types :error
   protect_from_forgery with: :exception, prepend: true
   before_action :store_location

app/controllers/conferences_controller.rb

@@ -72,7 +72,8 @@ class ConferencesController < ApplicationController
       @sponsors = @conference.sponsors
     end
     if splashpage.include_happening_now
-      @events_schedules = get_happening_now_events_schedules(@conference)
+      @event_list = get_happening_now_events_schedules(@conference)
+      @pagy, @events_schedules = pagy_array(@event_list, items: 2)
       @happening_now_url = happening_now_conference_schedule_path(conference_id: @conference.short_title, format: :json)
     end
   end

app/helpers/application_helper.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 module ApplicationHelper
+  include Pagy::Frontend
   # Returns a string build from the start and end date of the given conference.
   #
   # If the conference is only one day long

app/helpers/conference_helper.rb

@@ -3,6 +3,7 @@
 DEFAULT_LOGO = 'snapcon_logo.png'
 DEFAULT_COLOR = '#0B3559'
 
+
 module ConferenceHelper
   # Return true if only call_for_papers or call_for_tracks or call_for_booths is open
   def one_call_open(*calls)

app/views/conferences/show.html.haml

@@ -57,6 +57,8 @@
                   %h2.text-center Happening Now
                 - for event_schedule in @events_schedules
                   = render 'schedules/event', conference: @conference, event_schedule: event_schedule, event: event_schedule.event
+                .container{:style => "margin:auto; width:50%"}
+                  != pagy_nav(@pagy) 
               - else
                 .row
                   %h3.text-center There are no events happening now.
@@ -67,6 +69,7 @@
                 = markdown(@conference.description, escape_html=false)
               .trapezoid
 
+
   -# calls for content, or program
   - if @conference.splashpage.include_cfp
     = render 'call_for_content', conference: @conference,

config/initializers/pagy.rb

@@ -0,0 +1,175 @@
+# encoding: utf-8
+# frozen_string_literal: true
+
+# Pagy initializer file (4.1.0)
+# Customize only what you really need and notice that Pagy works also without any of the following lines.
+# Should you just cherry pick part of this file, please maintain the require-order of the extras
+
+
+# Extras
+# See https://ddnexus.github.io/pagy/extras
+
+
+# Backend Extras
+
+# Array extra: Paginate arrays efficiently, avoiding expensive array-wrapping and without overriding
+# See https://ddnexus.github.io/pagy/extras/array
+require 'pagy/extras/array'
+
+# Countless extra: Paginate without any count, saving one query per rendering
+# See https://ddnexus.github.io/pagy/extras/countless
+# require 'pagy/extras/countless'
+# Pagy::VARS[:cycle] = false    # default
+
+# Elasticsearch Rails extra: Paginate `ElasticsearchRails::Results` objects
+# See https://ddnexus.github.io/pagy/extras/elasticsearch_rails
+# default :pagy_search method: change only if you use
+# also the searchkick extra that defines the same
+# VARS[:elasticsearch_rails_search_method] = :pagy_search
+# require 'pagy/extras/elasticsearch_rails'
+
+# Searchkick extra: Paginate `Searchkick::Results` objects
+# See https://ddnexus.github.io/pagy/extras/searchkick
+# default :pagy_search method: change only if you use
+# also the elasticsearch_rails extra that defines the same
+# VARS[:searchkick_search_method] = :pagy_search
+# require 'pagy/extras/searchkick'
+
+# Frontend Extras
+
+# Bootstrap extra: Add nav, nav_js and combo_nav_js helpers and templates for Bootstrap pagination
+# See https://ddnexus.github.io/pagy/extras/bootstrap
+# require 'pagy/extras/bootstrap'
+
+# Bulma extra: Add nav, nav_js and combo_nav_js helpers and templates for Bulma pagination
+# See https://ddnexus.github.io/pagy/extras/bulma
+# require 'pagy/extras/bulma'
+
+# Foundation extra: Add nav, nav_js and combo_nav_js helpers and templates for Foundation pagination
+# See https://ddnexus.github.io/pagy/extras/foundation
+# require 'pagy/extras/foundation'
+
+# Materialize extra: Add nav, nav_js and combo_nav_js helpers for Materialize pagination
+# See https://ddnexus.github.io/pagy/extras/materialize
+# require 'pagy/extras/materialize'
+
+# Navs extra: Add nav_js and combo_nav_js javascript helpers
+# Notice: the other frontend extras add their own framework-styled versions,
+# so require this extra only if you need the unstyled version
+# See https://ddnexus.github.io/pagy/extras/navs
+# require 'pagy/extras/navs'
+
+# Semantic extra: Add nav, nav_js and combo_nav_js helpers for Semantic UI pagination
+# See https://ddnexus.github.io/pagy/extras/semantic
+# require 'pagy/extras/semantic'
+
+# UIkit extra: Add nav helper and templates for UIkit pagination
+# See https://ddnexus.github.io/pagy/extras/uikit
+# require 'pagy/extras/uikit'
+
+# Multi size var used by the *_nav_js helpers
+# See https://ddnexus.github.io/pagy/extras/navs#steps
+# Pagy::VARS[:steps] = { 0 => [2,3,3,2], 540 => [3,5,5,3], 720 => [5,7,7,5] }   # example
+
+
+# Feature Extras
+
+# Headers extra: http response headers (and other helpers) useful for API pagination
+# See http://ddnexus.github.io/pagy/extras/headers
+# require 'pagy/extras/headers'
+# Pagy::VARS[:headers] = { page: 'Current-Page', items: 'Page-Items', count: 'Total-Count', pages: 'Total-Pages' }     # default
+
+# Support extra: Extra support for features like: incremental, infinite, auto-scroll pagination
+# See https://ddnexus.github.io/pagy/extras/support
+# require 'pagy/extras/support'
+
+# Items extra: Allow the client to request a custom number of items per page with an optional selector UI
+# See https://ddnexus.github.io/pagy/extras/items
+# require 'pagy/extras/items'
+# Pagy::VARS[:items_param] = :items    # default
+# Pagy::VARS[:max_items]   = 100       # default
+
+# Overflow extra: Allow for easy handling of overflowing pages
+# See https://ddnexus.github.io/pagy/extras/overflow
+# require 'pagy/extras/overflow'
+# Pagy::VARS[:overflow] = :empty_page    # default  (other options: :last_page and :exception)
+
+# Metadata extra: Provides the pagination metadata to Javascript frameworks like Vue.js, react.js, etc.
+# See https://ddnexus.github.io/pagy/extras/metadata
+# you must require the shared internal extra (BEFORE the metadata extra) ONLY if you need also the :sequels
+# require 'pagy/extras/shared'
+# require 'pagy/extras/metadata'
+# For performance reason, you should explicitly set ONLY the metadata you use in the frontend
+# Pagy::VARS[:metadata] = [:scaffold_url, :count, :page, :prev, :next, :last]    # example
+
+# Trim extra: Remove the page=1 param from links
+# See https://ddnexus.github.io/pagy/extras/trim
+# require 'pagy/extras/trim'
+
+
+
+# Pagy Variables
+# See https://ddnexus.github.io/pagy/api/pagy#variables
+# All the Pagy::VARS are set for all the Pagy instances but can be overridden
+# per instance by just passing them to Pagy.new or the #pagy controller method
+
+
+# Instance variables
+# See https://ddnexus.github.io/pagy/api/pagy#instance-variables
+# Pagy::VARS[:items] = 20                                   # default
+
+
+# Other Variables
+# See https://ddnexus.github.io/pagy/api/pagy#other-variables
+# Pagy::VARS[:size]       = [1,4,4,1]                       # default
+# Pagy::VARS[:page_param] = :page                           # default
+# Pagy::VARS[:params]     = {}                              # default
+# Pagy::VARS[:anchor]     = '#anchor'                       # example
+# Pagy::VARS[:link_extra] = 'data-remote="true"'            # example
+
+
+# Rails
+
+# Rails: extras assets path required by the helpers that use javascript
+# (pagy*_nav_js, pagy*_combo_nav_js, and pagy_items_selector_js)
+# See https://ddnexus.github.io/pagy/extras#javascript
+# Rails.application.config.assets.paths << Pagy.root.join('javascripts')
+
+
+# I18n
+
+# Pagy internal I18n: ~18x faster using ~10x less memory than the i18n gem
+# See https://ddnexus.github.io/pagy/api/frontend#i18n
+# Notice: No need to configure anything in this section if your app uses only "en"
+# or if you use the i18n extra below
+#
+# Examples:
+# load the "de" built-in locale:
+# Pagy::I18n.load(locale: 'de')
+#
+# load the "de" locale defined in the custom file at :filepath:
+# Pagy::I18n.load(locale: 'de', filepath: 'path/to/pagy-de.yml')
+#
+# load the "de", "en" and "es" built-in locales:
+# (the first passed :locale will be used also as the default_locale)
+# Pagy::I18n.load({locale: 'de'},
+#                 {locale: 'en'},
+#                 {locale: 'es'})
+#
+# load the "en" built-in locale, a custom "es" locale,
+# and a totally custom locale complete with a custom :pluralize proc:
+# (the first passed :locale will be used also as the default_locale)
+# Pagy::I18n.load({locale: 'en'},
+#                 {locale: 'es', filepath: 'path/to/pagy-es.yml'},
+#                 {locale: 'xyz',  # not built-in
+#                  filepath: 'path/to/pagy-xyz.yml',
+#                  pluralize: lambda{|count| ... } )
+
+
+# I18n extra: uses the standard i18n gem which is ~18x slower using ~10x more memory
+# than the default pagy internal i18n (see above)
+# See https://ddnexus.github.io/pagy/extras/i18n
+# require 'pagy/extras/i18n'
+
+# Default i18n key
+# Pagy::VARS[:i18n_key] = 'pagy.item_name'   # default