fix: add missing id fields to serialized models

When making the serialized fields explicit in
0ee3a655 we forgot to add the id field
that is used in various places.

program/serializers.py

@@ -161,7 +161,7 @@ class CategorySerializer(serializers.ModelSerializer):
     class Meta:
         model = Category
         # TODO: replace `category` with `name` when the dashboard is updated
-        fields = ("category", "abbrev", "slug", "is_active", "description")
+        fields = ("id", "category", "abbrev", "slug", "is_active", "description")
 
 
 class HostLinkSerializer(serializers.ModelSerializer):
@@ -227,7 +227,7 @@ class HostSerializer(serializers.ModelSerializer):
 class LanguageSerializer(serializers.ModelSerializer):
     class Meta:
         model = Language
-        fields = ("name", "is_active")
+        fields = ("id", "name", "is_active")
 
 
 class TopicSerializer(serializers.ModelSerializer):
@@ -237,7 +237,7 @@ class TopicSerializer(serializers.ModelSerializer):
     class Meta:
         model = Topic
         # TODO: replace `topic` with `name` when the dashboard is updated
-        fields = ("topic", "abbrev", "slug", "is_active")
+        fields = ("id", "topic", "abbrev", "slug", "is_active")
 
 
 class MusicFocusSerializer(serializers.ModelSerializer):
@@ -247,7 +247,7 @@ class MusicFocusSerializer(serializers.ModelSerializer):
     class Meta:
         model = MusicFocus
         # TODO: replace `focus` with `name` when the dashboard is updated
-        fields = ("focus", "abbrev", "slug", "is_active")
+        fields = ("id", "focus", "abbrev", "slug", "is_active")
 
 
 class TypeSerializer(serializers.ModelSerializer):
@@ -257,7 +257,7 @@ class TypeSerializer(serializers.ModelSerializer):
     class Meta:
         model = Type
         # TODO: replace `type` with `name` when the dashboard is updated
-        fields = ("type", "slug", "is_active")
+        fields = ("id", "type", "slug", "is_active")
 
 
 class FundingCategorySerializer(serializers.ModelSerializer):
@@ -267,7 +267,7 @@ class FundingCategorySerializer(serializers.ModelSerializer):
     class Meta:
         model = FundingCategory
         # TODO: replace `fundingcategory` with `name` when the dashboard is updated
-        fields = ("fundingcategory", "abbrev", "slug", "is_active")
+        fields = ("id", "fundingcategory", "abbrev", "slug", "is_active")
 
 
 class ShowSerializer(serializers.HyperlinkedModelSerializer):