Невозможно отобразить все объекты в массиве в цикле v-for, отображается только последний объект

// I initialize an empty array in data
data() {
  return {
    locArray: []
  }
}


// This is done in the api call, in beforeRouteEnter()

const items = data.continental;

Array.prototype.groupBy = function(prop) {
  return this.reduce(function(groups, item) {
    const val = item[prop];
    groups[val] = groups[val] || [];
    groups[val].push(item);
    return groups;
  }, {});
};

for (let i in items) {
  let source = items[i];
  let details = source.details;
  let groupedByLocation = details.groupBy(location);
  vm.locArray = groupedByLocation
}

// This is an example of what the data looks like
{
  data: {
    continental: {
      countryOne: {
        weather: "weatherOne",
        details: [{
          location: "west",
          foods: "foodOne",
          mainCities: [
            "cityOne",
            "cityTwo",
            "cityThree"
          ]
        }]
      },
      countryTwo: {
        weather: "weatherTwo",
        details: [{
          location: "north",
          foods: "foodTwo",
          mainCities: [
            "cityOne",
            "cityTwo",
            "cityThree"
          ]
        }]
      },
      countryThree: {
        weather: "weatherThree",
        details: [{
          location: "north",
          foods: "foodThree",
          mainCities: [
            "cityOne",
            "cityTwo",
            "cityThree"
          ]
        }]
      },
      countryFour: {
        weather: "WeatherFour",
        details: [{
          location: "west",
          foods: "foodFour",
          mainCities: [
            "cityOne",
            "cityTwo",
            "cityThree"
          ]
        }]
      },
      countryfive: {
        weather: "WeatherFive",
        details: [{
          location: "north",
          foods: "foodFive",
          mainCities: [
            "cityOne",
            "cityTwo",
            "cityThree"
          ]
        }]
      }
    }
  }
}

<div class="entry-content">
  <div class="single-entry" v-for="loc in locArray" :key="loc.id">
    <span class="test-wrap">{{ loc }}</span>
  </div>
</div>