🥣 other_exhibits serializer (#141)

* Adds custom other_exhibits serializer

* Returns None if missing author

authors/models.py

@@ -25,11 +25,11 @@ class AuthorsOrderable(Orderable):
 
     @property
     def name(self):
-        return self.author.name
+        return self.author.name if self.author else None
 
     @property
     def image(self):
-        return self.author.image
+        return self.author.image if self.author else None
 
     api_fields: ClassVar[list[APIField]] = [
         APIField('author_id'),

exhibits/models.py

@@ -3,6 +3,7 @@
 from django.db import models
 from modelcluster.fields import ParentalKey
 from pydantic import BaseModel
+from rest_framework import serializers
 from wagtail.admin.panels import FieldPanel, InlinePanel, MultiFieldPanel
 from wagtail.api import APIField
 from wagtail.fields import RichTextField
@@ -16,6 +17,8 @@
 
 
 class ExhibitsOrderable(Orderable):
+    """Ordered list of other exhibits related to this exhibit"""
+
     page = ParentalKey('exhibits.ExhibitPage', related_name='other_exhibits', null=True)
     exhibit = models.ForeignKey(
         'exhibits.ExhibitPage',
@@ -49,6 +52,27 @@ def authors(self):
     ]
 
 
+class OtherExhibitsField(APIField):
+    """API field for other_exhibits"""
+
+    class Meta:
+        model = ExhibitsOrderable
+
+
+class OtherExhibitsSerializer(serializers.ModelSerializer):
+    """Serializer for other_exhibits field"""
+
+    cover_image = ImageRenditionField('fill-320x100')
+
+    class Meta:
+        model = ExhibitsOrderable
+        fields: ClassVar[list[str]] = [
+            'exhibit_id',
+            'title',
+            'cover_image',
+        ]
+
+
 class ImageApiSchema(BaseModel):
     url: str
     width: int
@@ -119,5 +143,7 @@ class ExhibitPage(HeadlessMixin, Page):
             serializer=ImageRenditionField('fill-480x270', source='hero_image'),
         ),
         APIField('authors'),
-        APIField('other_exhibits'),
+        OtherExhibitsField(
+            'other_exhibits', serializer=OtherExhibitsSerializer(many=True)
+        ),
     ]