changed tags from array to string

message.model.js

     subject: { type: String, required: true },
     message: { type: String, required: true },
     user: { type: String, required: true },
-    tag: {type: [String] },
+    tag: {type: String },
 });
 
 module.exports = mongoose.model('Message', MessageSchema);

public/createMessage.js

 <div class="card om-card">
 	<h4>Neue Nachricht erstellen</h4>
 	<form class="new-msg-form" @submit.prevent=createMsg>
+        <div class="form-group">
+			<label class="bmd-label-floating">User*</label>
+			<input type="text" class="form-control" id="user">
+		</div>
 		<div class="form-group bmd-form-group">
-			<label class="bmd-label-floating">Betreff</label>
+			<label class="bmd-label-floating">Betreff*</label>
 			<input type="text" class="form-control" id="subject">
 		</div>
 		<div class="form-group bmd-form-group">
 			<input type="text" class="form-control" id="tag">
 		</div>
 		<div class="form-group">
-			<label class="bmd-label-floating">Nachricht</label>
+			<label class="bmd-label-floating">Nachricht*</label>
 			<textarea class="form-control" id="message" rows="5"></textarea>
 		</div>
-		<div class="form-group">
-			<label class="bmd-label-floating">User</label>
-			<input type="text" class="form-control" id="user">
-		</div>
 		<button class="btn btn-default"><a @click="$router.go(-1)">ABBRECHEN </a></button>
 		<button type="submit" class="btn btn-raised om-btn"><a @click="$router.push('/home')">SENDEN</a></button>
 	</form>