javascript - 如何在 Mongoose 填充后使用 .where()

Question

所以我有两个模式

var subcategories = new Schema({
    //the category being populated needs to be the same case ;
    categoryId: [{ type: Schema.ObjectId, ref: 'categories' }],
    name: String,
    description:  String,
    display:  Boolean,
    active: Boolean,
    sortOrder:  Number,
    createDate: Date,
    updateDate: Date,
    type:  String,
    startDate: Date,
    endDate: Date,
    authorId: String
});

和

var categories = new Schema({
    name: String,
    description:  String,
    display:  Boolean,
    active: Boolean,
    sortOrder:  Number,
    createDate: Number,
    updateDate: Number,
    type:  String,
    startDate: Date,
    endDate: Date,
    authorId: String
});

并且我希望只有在类别/子类别中的事件/显示为真时才返回查询。我遇到的问题是如何在填充后正确设置 categoryId 的过滤器。这是我到目前为止所拥有的

exports.generateList = function (req, res) {
    subcategories
            .find({})//grabs all subcategoris
            .where('categoryId').ne([])//filter out the ones that don't have a category
            .populate('categoryId')
            .where('active').equals(true)
            .where('display').equals(true)
            .where('categoryId.active').equals(true)
            .where('display').in('categoryId').equals(true)
            .exec(function (err, data) {
            if (err) {
                console.log(err);
                console.log('error returned');
                res.send(500, { error: 'Failed insert' });
            }

            if (!data) {
                res.send(403, { error: 'Authentication Failed' });
            }

            res.send(200, data);
            console.log('success generate List');
        });
    };

唯一的问题是，即使我有一个 display = false 的类别，它仍然会被返回。

Answer 1

要为填充的引用构建查询条件，有一些特殊的方法可以引用 here :

Query conditions and other options

What if we wanted to populate our fans array based on their age, select just their names, and return at most, any 5 of them?

Story
  .find(...)
  .populate({
    path: 'fans',
    match: { age: { $gte: 21 }},
    select: 'name -_id',
    options: { limit: 5 }
})
.exec()

所以在你的情况下，你需要做类似的事情:

subcategories
  .find({})//grabs all subcategoris
  .where('categoryId').ne([])//filter out the ones that don't have a category
  .where('active').equals(true)
  .where('display').equals(true)
  .populate({
    path: 'categoryId',
    match: {
      active: true,
      display: true,
    }
  })
  .exec()