eolas/Databases/MongoDB/Querying_a_collection_with_Mongoose.md

tags
Databases mongo_db node-js mongoose

Query a Mongo collection with Mongoose

We now have the following entries in our courses collection:

{
  name: 'Python Course',
  author: 'Terry Ogleton',
  tags: [ 'python', 'backend' ],
  isPublished: true,
  _id: new ObjectId("62f4e2527ac4aa2c30d41d23"),
  date: 2022-08-11T11:04:50.750Z,
  __v: 0
}
{
  name: 'Javascript Course',
  author: 'Tosh Gnomay',
  tags: [ 'js', 'frontend' ],
  isPublished: true,
  _id: new ObjectId("62f4e2527ac4aa2c30d41d24"),
  date: 2022-08-11T11:04:50.750Z,
  __v: 0
}

Now we will query the collection. This capability is provided via the Mongoose schema class we used to create the Course model. We have the following methods available to use from the schema:

• find
• findById
• findByIdAndRemove
• findByIdAndUpdate
• findOne
• findOneAndUpdate
• findOneAndRemove
• ...

The various find methods return a value that is promisified.

Return all values in a collection: find

async function getCourses(){
  const courses = await Course.find()
  console.log(courses)
}

Filter values returned

async function getCourses(){
  const courses = await Course.find({author: 'Tosh Gnomay', isPublished: true})
  console.log(courses)
}