如何从猫鼬中获得特定的不同领域？

Question

我有这样的数据库集合

[
{
name: "Fried Burger",
image: "https://burgerimage.com",
category: "burger"
},
{
name: "Fried Pizza",
image: "https://pizzaimage.com",
category: "pizza"
},
{
name: "Veg Pizza",
image: "https://vegpizzaimage.com",
category: "pizza"
},
{
name: "Fried Pasta",
image: "https://friedpastaimage.com",
category: "pasta"
}
]

有什么方法可以让我从类别中获得价值而无需重复和单个图像，尽管有多个这样的类别

[
{category: "burger", image:"https://burgerimage.com"},
{category: "pizza", image:"https://pizzaimage.com"}, //Any image works as long as category is same
{category: "pasta", image:"https://pastaimage.com"}

我使用了 .distinct('category') 但它只返回这样，但我也想要一张带有该图像的图像

{
  "category": [
    "Burger",
    "beef",
    "chicken",
    "duck",
    "pasta",
    "pizza",
    "pork"
  ]
}

Answer 1

如果你只想要每个类别和图片，试试这个

MyModel.find({} , 'category image', function(err, docs) { })