[OSU-124] Improve facility show loading speed

app/helpers/application_helper.rb

@@ -50,7 +50,7 @@ def facility_product_path(facility, product)
   def warning_if_instrument_is_offline_or_partially_available(instrument)
     if instrument.offline?
       tooltip_icon "fa fa-exclamation-triangle icon-large", t("instruments.offline.note")
-    elsif instrument.alert
+    elsif instrument.alert.present?
       tooltip_icon "fa fa-exclamation-triangle partially-available-warning icon-large", instrument.alert.note
     end
   end

app/models/concerns/products/scheduling_support.rb

@@ -77,7 +77,11 @@ def quick_reservation_intervals
   end
 
   def offline?
-    current_offline_reservations.present?
+    if current_offline_reservations.loaded?
+      current_offline_reservations.present?
+    else
+      current_offline_reservations.exists?
+    end
   end
 
   def offline_category

app/models/instrument.rb

@@ -24,13 +24,11 @@ module Pricing
     end
   end.freeze
 
-  with_options foreign_key: "product_id" do |instrument|
-    instrument.has_many :admin_reservations
-    instrument.has_many :instrument_price_policies
-    instrument.has_many :offline_reservations
-    instrument.has_many :current_offline_reservations, -> { current }, class_name: "OfflineReservation"
+  with_options foreign_key: "product_id" do
+    has_many :admin_reservations
+    has_many :instrument_price_policies
+    has_many :offline_reservations
   end
-  has_one :alert, dependent: :destroy, class_name: "InstrumentAlert"
 
   email_list_attribute :cancellation_email_recipients
   email_list_attribute :issue_report_recipients

app/models/product.rb

@@ -23,10 +23,20 @@ class Product < ApplicationRecord
   has_one :product_display_group_product
   has_one :product_display_group, through: :product_display_group_product
 
+  # Instrument specifc
+  has_one(
+    :alert,
+    dependent: :destroy,
+    class_name: "InstrumentAlert",
+    foreign_key: :instrument_id,
+    inverse_of: :instrument
+  )
+  has_many :current_offline_reservations, -> { current }, class_name: "OfflineReservation"
+
+  before_save :start_time_disabled_daily_booking_only
   after_create :create_default_price_group_products
   after_create :create_skip_review_price_policies, if: :skip_review_mode?
   after_create :create_nonbillable_price_policy, if: :nonbillable_mode?
-  before_save :start_time_disabled_daily_booking_only
 
   email_list_attribute :training_request_contacts
 
@@ -70,11 +80,9 @@ def self.billing_modes
   scope :mergeable_into_order, -> { not_archived.where(type: mergeable_types) }
   scope :cross_core_available, -> { where(cross_core_ordering_available: true) }
   scope :in_active_facility, -> { joins(:facility).where(facilities: { is_active: true }) }
-  scope :of_type, ->(type) { where(type: type) }
+  scope :of_type, ->(type) { where(type:) }
   scope :with_schedule, -> { where.not(schedule_id: nil) }
-  scope :without_display_group, -> {
-    left_outer_joins(:product_display_group_product).where(product_display_group_products: { id: nil })
-  }
+  scope :without_display_group, -> { where.missing(:product_display_group_product) }
 
   # All product types. This cannot be a cattr_accessor because the block is evaluated
   # at definition time (not lazily as I expected) and this causes a circular dependency
@@ -332,10 +340,6 @@ def is_accessible_to_user?(user)
     !(is_archived? || (is_hidden? && !is_operator))
   end
 
-  def alert
-    nil
-  end
-
   def duration_pricing_mode?
     false
   end

app/models/product_display_group.rb

@@ -22,7 +22,10 @@ def to_s
 
   def self.fake_groups_by_type(products)
     Product.orderable_types.map do |type|
-      Fake.new(name: type.constantize.model_name.human(count: :many), products: products.where(type: type))
+      Fake.new(
+        name: type.constantize.model_name.human(count: :many),
+        products: products.where(type:)
+      )
     end
   end
 

app/views/facilities/_product_display_group.html.haml

@@ -1,4 +1,4 @@
-- collection = product_display_group.products.merge(@product_scope)
+- collection = product_display_group.products.merge(@product_scope).includes(:alert, :current_offline_reservations)
 - if collection.present?
   .product_list{ class: classes }
     %h3= product_display_group