Use MultipleChooserPanel instead of InlinePanel in BlogPage and RecipePage

It allows selecting multiple authors at once and functions as a great
demo of this panel.

bakerydemo/blog/models.py

@@ -6,7 +6,7 @@ from django.shortcuts import redirect, render
 from modelcluster.contrib.taggit import ClusterTaggableManager
 from modelcluster.fields import ParentalKey
 from taggit.models import Tag, TaggedItemBase
-from wagtail.admin.panels import FieldPanel, InlinePanel
+from wagtail.admin.panels import FieldPanel, MultipleChooserPanel
 from wagtail.contrib.routable_page.models import RoutablePageMixin, route
 from wagtail.fields import StreamField
 from wagtail.models import Orderable, Page
@@ -76,8 +76,9 @@ class BlogPage(Page):
         FieldPanel("image"),
         FieldPanel("body"),
         FieldPanel("date_published"),
-        InlinePanel(
+        MultipleChooserPanel(
             "blog_person_relationship",
+            chooser_field_name="person",
             heading="Authors",
             label="Author",
             panels=None,

bakerydemo/recipes/models.py

@@ -1,6 +1,11 @@
 from django.db import models
 from modelcluster.fields import ParentalKey
-from wagtail.admin.panels import FieldPanel, HelpPanel, InlinePanel, MultiFieldPanel
+from wagtail.admin.panels import (
+    FieldPanel,
+    HelpPanel,
+    MultiFieldPanel,
+    MultipleChooserPanel,
+)
 from wagtail.fields import RichTextField, StreamField
 from wagtail.models import Orderable, Page
 from wagtail.search import index
@@ -85,8 +90,9 @@ class RecipePage(Page):
             heading="Preface",
         ),
         FieldPanel("body"),
-        InlinePanel(
+        MultipleChooserPanel(
             "recipe_person_relationship",
+            chooser_field_name="person",
             heading="Authors",
             label="Author",
             help_text="Select between one and three authors",