mensa/src/components/Mensa.vue

<template>
  <div class="hello">
    <router-link :to="'/' + $route.params.mensa + '/heute'">Heute</router-link>
    <router-link :to="'/' + $route.params.mensa + '/morgen'">Morgen</router-link>
    <router-link :to="'/' + $route.params.mensa + '/uebermorgen'">Übermorgen</router-link>
    <router-view></router-view>
  </div>
</template>

<script>
export default {
  name: 'mensa',
  data () {
    return {
    }
  },
  created () {
    if (!this.$route.params.tag) {
      this.$router.replace(`heute`)
    }
  }
}
</script>

<style></style>