Marketplace: Shopper chooses DeliveryArea independently

- #1672

So, in reviewing a bunch of the delivery app workflows, most of them have:

- Choose Pickup or Delivery
- Enter Address
- Browse Menu
- Tap Item
- Add Item to Order

This lends me to believe we want to switch to gathering the
`DeliveryArea` *then* `DeliveryAddress` *then* showing the
`Products` that are available.

This uses TurboFrames to replace pieces of the page, rather than relying
on TurboStreams. On the one hand, it's lot easier (just respond with
html with matching `turbo_frame_tag`s`).

Blerg; anyway, I'm checking this in now; but not sure if I like it
enough.

Thoughts? In particular:

- Copy-editing
- Design tweaks?
- Name Collisions: How Undo?

app/furniture/marketplace/breadcrumbs.rb

@@ -12,6 +12,11 @@
   link t("marketplace.marketplace.edit.link_to"), marketplace.location(:edit)
 end
 
+crumb :edit_marketplace_cart_delivery_area do |delivery_area|
+  parent :room, delivery_area.cart.room
+  link t("marketplace.cart.delivery_areas.edit.link_to"), marketplace.location(:edit)
+end
+
 crumb :marketplace_checkout do |checkout|
   parent :marketplace, checkout.cart.marketplace
   link "Checkout", checkout.location

app/furniture/marketplace/cart.rb

@@ -12,7 +12,10 @@ class Cart < Record
 
     belongs_to :shopper, inverse_of: :carts
 
-    belongs_to :delivery_area, inverse_of: :carts, optional: true
+    belongs_to :delivery_area, inverse_of: :carts, class_name: "::Marketplace::DeliveryArea"
+    def cart_delivery_area
+      DeliveryArea.new(cart: self, delivery_area: delivery_area)
+    end
 
     has_many :cart_products, dependent: :destroy, inverse_of: :cart
     has_many :products, through: :cart_products, inverse_of: :carts

app/furniture/marketplace/cart/delivery_area.rb

@@ -0,0 +1,10 @@
+class Marketplace
+  class Cart::DeliveryArea < Model
+    attr_accessor :cart, :delivery_area
+    extend StripsNamespaceFromModelName
+    location parent: :cart, routed_as: :resource
+
+    delegate :label, to: :delivery_area
+    delegate :marketplace, :update, :persisted?, to: :cart
+  end
+end

app/furniture/marketplace/cart/delivery_area_policy.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class Marketplace
+  class Cart::DeliveryAreaPolicy < Policy
+    alias_method :delivery_area, :object
+
+    def permitted_attributes(_params)
+      %(delivery_area_id)
+    end
+
+    class Scope < ApplicationScope
+      def resolve
+        scope.all
+      end
+    end
+  end
+end

app/furniture/marketplace/cart/delivery_areas/_delivery_area.html.erb

@@ -0,0 +1,10 @@
+<%= turbo_frame_tag(dom_id(delivery_area.cart, :delivery_area)) do %>
+  <%- if delivery_area.delivery_area.present? %>
+    <%= render CardComponent.new(classes: "text-left") do %>
+      <%= delivery_area.label %>
+      <%= link_to(t('marketplace.cart.delivery_areas.edit.link_to'), delivery_area.location(:edit)) %>
+    <%- end %>
+  <%- else %>
+    <%= render "marketplace/cart/delivery_areas/form", delivery_area: delivery_area %>
+  <%- end %>
+<%- end %>

app/furniture/marketplace/cart/delivery_areas/_form.html.erb

@@ -0,0 +1,6 @@
+<%= render CardComponent.new(dom_id: dom_id(delivery_area), classes: "text-left") do %>
+  <%= form_with model: delivery_area.location do |form| %>
+    <%= render "select", options: delivery_area.marketplace.delivery_areas.pluck(:label, :id), include_blank: true, attribute: :delivery_area_id, form: form %>
+    <%= form.submit %>
+  <%- end %>
+<%- end %>

app/furniture/marketplace/cart/delivery_areas/edit.html.erb

@@ -0,0 +1,4 @@
+<%- breadcrumb :edit_marketplace_cart_delivery_area, delivery_area %>
+<%= turbo_frame_tag(dom_id(cart, :delivery_area)) do %>
+  <%= render "form", cart: cart %>
+<%- end %>

app/furniture/marketplace/cart/delivery_areas/show.html.erb

@@ -0,0 +1,2 @@
+<%- breadcrumb :marketplace_cart_delivery_area, :delivery_area %>
+<%= render delivery_area %>

app/furniture/marketplace/cart/delivery_areas_controller.rb

@@ -0,0 +1,25 @@
+class Marketplace
+  class Cart::DeliveryAreasController < Controller
+    expose :delivery_area, -> { cart.cart_delivery_area }
+    expose :cart, scope: -> { carts }, model: Cart
+    expose :carts, -> { policy_scope(marketplace.carts) }
+
+    def show
+      authorize(delivery_area)
+    end
+
+    def edit
+      authorize(delivery_area)
+    end
+
+    def update
+      authorize(delivery_area)
+      delivery_area.update(delivery_area_params)
+      redirect_to delivery_area.location
+    end
+
+    def delivery_area_params
+      params.require(:delivery_area).permit(:delivery_area_id)
+    end
+  end
+end

app/furniture/marketplace/locales/en.yml

@@ -11,6 +11,9 @@ en:
               required: "can't be blank"
   marketplace:
     cart:
+      delivery_areas:
+        edit:
+          link_to: "Change Your Location"
       deliveries:
         edit:
           header: "Delivery Details"

app/furniture/marketplace/marketplace_component.html.erb

@@ -1,6 +1,9 @@
 
 <%= render onboarding_component %>
 
+
+<%= render(cart.cart_delivery_area) %>
+
 <%= render cart %>
 
 <%- if policy(marketplace).edit? %>

app/furniture/marketplace/routes.rb

@@ -6,6 +6,7 @@ def self.append_routes(router)
           router.resources :cart_products
           router.resource :checkout, only: [:show, :create]
           router.resource :delivery, controller: "cart/deliveries"
+          router.resource :delivery_area, controller: "cart/delivery_areas"
         end
 
         router.resources :delivery_areas