how to query collection which has multiple schemas or models?

问题

I inserted several documents that use different schemas(or models) in one collection and I need to query the collection through all documents. query is {reason: {$or: [1, 2]}} and {_id: objectid('xxx')}. how can i do?

var eqAddPendingSchema = new Schema({
    idString: String,
    name: String,
    category: String,
    life_cycle: Number,
    location: String,
    purchase_date: String,
    description: String,
    image: String,
    video: String,
    reason: Number,
    comment: String,
    created_at: Number,
    updated_at: Number
}, {collection: 'equipments_pending'});
var eqBookPendingSchema = new Schema({
    eq_dbId: String,
    user_dbId: String,
    from: Number,
    to: Number,
    reason: Number,
    created_at: Number,
    updated_at: Number
}, {collection: 'equipments_pending'});
inspectionPendingSchema = new Schema({
    user_dbId: String,
    eq_dbId: String,
    status: Number,
    comment: String,
    reason: Number,
    timestamp: Number,
    created_at: Number,
    updated_at: Number
}, {collection: 'equipment_pending'});
maintainPendingSchema = new Schema({
    user_dbId: String,
    eq_dbId: String,
    status: Number,
    comment: String,
    reason: Number,
    timestamp: Number,
    created_at: Number,
    updated_at: Number
}, {collection: 'equipment_pending'});

回答1:

I'm wondering why you are making many schema's specially for inspectionPendingSchema and maintain booth are the same, please find better design.

I don't know if it's typo error or not you have defined two schema's linked with equipments_pending and other two linked with equipment_pending

After defining all schema's you have to define modules

var aModule = mongoose.model('eqAddPendingSchema', eqAddPendingSchema);
var bModule = mongoose.model('eqBookPendingSchema', eqBookPendingSchema);


var cModule = mongoose.model('inspectionPendingSchema', inspectionPendingSchema);
var dModule = mongoose.model('maintainPendingSchema', maintainPendingSchema);

to find if reason equal 1 or 2 and id equal x

aModule.find({ reason: { $in: [1, 2] } , _id: "5d641cd4d65a0b18b22ddd86" } ,(e,d) =>{
        console.log(d);
       ////// change code
        var newd = d;
        newd.newKey = 'newVariable';
        res.send(newd);
      ////////////change end
    });

来源：https://stackoverflow.com/questions/57661644/how-to-query-collection-which-has-multiple-schemas-or-models

标签

node.js

mongoose-schema