From 7be292cd81edebb5596997e059a36e0cd7fd02fa Mon Sep 17 00:00:00 2001
From: James <james@trbl.design>
Date: Fri, 24 Jan 2020 19:22:32 -0500
Subject: [PATCH] validates missing useAsTitle

---
 src/collections/validate.js     | 9 ++++++++-
 src/errors/MissingUseAsTitle.js | 9 +++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 src/errors/MissingUseAsTitle.js

diff --git a/src/collections/validate.js b/src/collections/validate.js
index ecd6560979..1f19b79875 100644
--- a/src/collections/validate.js
+++ b/src/collections/validate.js
@@ -1,12 +1,19 @@
 const errors = require('../errors');
 
-const { DuplicateCollection, MissingCollectionLabel } = errors;
+const { DuplicateCollection, MissingCollectionLabel, MissingUseAsTitle } = errors;
 
 module.exports = function validateCollection(collection, collections) {
   if (!collection.labels.singular) {
     throw new MissingCollectionLabel(collection);
   }
 
+  const { useAsTitle } = collection;
+  const fieldToUseAsTitle = collection.fields.find(field => useAsTitle === field.name);
+
+  if (!fieldToUseAsTitle) {
+    throw new MissingUseAsTitle(collection);
+  }
+
   if (collections && collections[collection.labels.singular]) {
     throw new DuplicateCollection(collection);
   }
diff --git a/src/errors/MissingUseAsTitle.js b/src/errors/MissingUseAsTitle.js
new file mode 100644
index 0000000000..b2ec6d62d7
--- /dev/null
+++ b/src/errors/MissingUseAsTitle.js
@@ -0,0 +1,9 @@
+const APIError = require('./APIError');
+
+class MissingUseAsTitle extends APIError {
+  constructor(collection) {
+    super(`${collection.labels.singular} collection is missing a useAsTitle property.`);
+  }
+}
+
+module.exports = MissingCollectionLabel;