fix: Improved model validation for Collection (#3749)

* fix: Added improved model validation for Collection attributes

* sp

* fix: Enforce title length in UI

server/models/validators/IsHexColor.ts

@@ -0,0 +1,17 @@
+import { isHexColor } from "class-validator";
+import { addAttributeOptions } from "sequelize-typescript";
+
+/**
+ * A decorator that validates that a string is a valid hex color code.
+ */
+export default function IsHexColor(target: any, propertyName: string) {
+  return addAttributeOptions(target, propertyName, {
+    validate: {
+      validDomain(value: string) {
+        if (!isHexColor(value)) {
+          throw new Error("Must be a valid hex color code");
+        }
+      },
+    },
+  });
+}

server/models/validators/Length.ts

@@ -7,11 +7,11 @@ import { addAttributeOptions } from "sequelize-typescript";
  */
 export default function Length({
   msg,
-  min,
+  min = 0,
   max,
 }: {
   msg?: string;
-  min: number;
+  min?: number;
   max: number;
 }): (target: any, propertyName: string) => void {
   return (target: any, propertyName: string) =>