Mongoose Query and Update Examples

mongoose_examples.js

// Example of a schema for a Poll document
const PollSchema = new mongoose.Schema({
  createdBy: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'User'
  },
  createdTime: {
    type: String,
    required: true
  },
  title: {
    type: String,
    required: true
  },
  shortName: {
    type: String,
    required: true
  },
  choices: [{
    index: Number,
    choice: String,
    votes: Number
  }],
  voters: [{
    votedBy: {
      type: mongoose.Schema.Types.ObjectId,
      ref: 'User'
    },
    datevoted: Date,
    choiceIndex: Number
  }]
})

// Creating model from PollSchema
const Poll = mongoose.model('Poll', PollSchema, 'polls')


// Example document
{
  //...
  title: "How do you like your coffee",
  choices: [
    {
      choice: 'Regular',
      votes: 5
    },
    {
      choice: 'Decaf',
      votes: 1
    }
  ]
}

// Search for a single document by _id then pull an object out of an Array within the document
Poll
.findOne({ _id: poll._id })
.update({ $pull: { 'choices': { 'choice': 'Decaf' } } }) //<== Remove object from choices
.exec(console.error)