Mongoose is a networking library written in C. It is a swiss army knife for embedded network programming. It implements event-driven non-blocking APIs for TCP, UDP, HTTP, WebSocket, CoAP.. doc The mongoose document which is being converted. If you pass a transform in toObject() options, Mongoose will apply the transform to subdocuments in addition to the top-level document
schema.set('toObject', { virtuals: true }) Transform We may need to perform a transformation of the resulting object based on some criteria, say to remove some sensitive information or return a custom object. In this case we set the optional transform function. Mongoose Course: Master Object-Document Mapper for NodeJS and MongoDB. Create custom Mongoose setters and getters methods for each field. Perform validation so your app is protected..
If path is given, checks if a path or any full path containing path as part of its path chain has been modified.product.remove(function (err, product) { product.$isDeleted(); // true product.remove(); // no-op, doesn't send anything to the db product.$isDeleted(false); product.$isDeleted(); // false product.remove(); // will execute a remove against the db }) Document.prototype.$isEmpty()Returns:«Boolean» Returns true if the given path is nullish or only contains empty objects. Useful for determining whether this subdoc will get stripped out by the minimize option. Understanding Mongoose Deep Population. 24 January 2016 — Josh Beam — mongodb. While MongoDB doesn't natively support joins, the Mongoose framework now supports deep population..
const session = MyModel.startSession(); const doc = await MyModel.findOne().session(session); doc.$session() === session; // true doc.$session(null); doc.$session() === null; // true If this is a top-level document, setting the session propagates to all child docs.const memberSchema = new Schema({ name: String, email: String }); const groupSchema = new Schema({ members: [memberSchema], name: String, email }); const Group = mongoose.model('Group', groupSchema); const doc = new Group({ name: 'Engineering', email: 'dev@mongoosejs.io', members: [{ name: 'Val', email: 'val@mongoosejs.io' }] }); // Removes `email` from both top-level document **and** array elements // { name: 'Engineering', members: [{ name: 'Val' }] } doc.toObject({ transform: (doc, ret) => { delete ret.email; return ret; } }); Transforms, like all of these options, are also available for toJSON. See this guide to JSON.stringify() to learn why toJSON() and toObject() are separate functions.Model.findOne().populate('author').exec(function (err, doc) { console.log(doc.author.name) // Dr.Seuss console.log(doc.populated('author')) // '5144cf8050f071d979c118a7' }) If the path was not populated, undefined is returned.
MyModel = mongoose.model('test', { name: { type: String, default: 'Val '} }); const m = new MyModel(); m.$isDefault('name'); // true Document.prototype.$isDeleted()Parameters[val] «Boolean» optional, overrides whether mongoose thinks the doc is deleted// path, value doc.set(path, value) // object doc.set({ path : value , path2 : { path : value } }) // on-the-fly cast to number doc.set(path, value, Number) // on-the-fly cast to string doc.set(path, value, String) // changing strict mode behavior doc.set(path, value, { strict: false }); Document.prototype.toJSON()Parametersoptions «Object» Returns:«Object» The return value of this method is used in calls to JSON.stringify(doc).
schema.pre('save', function() { // Mongoose will set `isNew` to `false` if `save()` succeeds this.$locals.wasNew = this.isNew; }); schema.post('save', function() { // Prints true if `isNew` was set before `save()` console.log(this.$locals.wasNew); }); Document.prototype.$markValid()Parameterspath «String» the field to mark as validPopulates document references, executing the callback when complete. If you want to use promises instead, use this function with execPopulate()
This method is called pre save and if a validation rule is violated, save is aborted and the error is returned to your callback.const promise = doc. populate('company'). populate({ path: 'notes', match: /airline/, select: 'text', model: 'modelName' options: opts }). execPopulate(); // summary doc.execPopulate().then(resolve, reject); // you can also use doc.execPopulate(options) as a shorthand for // doc.populate(options).execPopulate() By default, Mongoose don't return the post-update document. Note the third parameter with new: true, it produces that doc on callback function it's the post-update document Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. The maintainers of mongoose and thousands of other packages are working with Tidelift to deliver.. Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment.It provides a straight-forward, schema-based solution to model your application data
doc «Object» values for initial set. optional «[fields]» object containing the fields that were selected in the query which returned this document. You do not need to set this parameter to ensure Mongoose.. Model.findOne().populate('author').exec(function (err, doc) { console.log(doc.author.name); // Dr.Seuss console.log(doc.depopulate('author')); console.log(doc.author); // '5144cf8050f071d979c118a7' }) If the path was not populated, this is a no-op.const newProduct = await product.save(); newProduct === product; // true Document.prototype.schemaType:«property»The documents schema.
Mongoose: npm install mongoose@5 --save. Note. The Mongoose example connection below is Connect to Cosmos DB using the Mongoose framework by adding the following code to the end of.. Mongoose supports two Schema options to transform Objects after querying MongoDb: toObject After playing around with toObject and toJSON transforms with sub-documents, I observed the..
This getter exists on all documents by default. The getter can be disabled by setting the id option of its Schema to false at construction time.Overwrite all values in this document with the values of obj, except for immutable properties. Behaves similarly to set(), except for it unsets all properties that aren't in obj. Mongoose 顺序处理每一个 createIndex ，然后在model触发 'index' 事件。 While nice for development, it is recommended this behavior be disabled in production since index creation can cause a significant..
schema.options.toObject.hide = '_id'; schema.options.toObject.transform = function (doc, ret, options) { if (options.hide) { options.hide.split(' ').forEach(function (prop) { delete ret[prop]; }); } return ret; } const doc = new Doc({ _id: 'anId', secret: 47, name: 'Wreck-it Ralph' }); doc.toObject(); // { secret: 47, name: 'Wreck-it Ralph' } doc.toObject({ hide: 'secret _id', transform: false });// { _id: 'anId', secret: 47, name: 'Wreck-it Ralph' } doc.toObject({ hide: 'secret _id', transform: true }); // { name: 'Wreck-it Ralph' } If you pass a transform in toObject() options, Mongoose will apply the transform to subdocuments in addition to the top-level document. Similarly, transform: false skips transforms for all subdocuments.This method accepts the same options as Document#toObject. To apply the options to every document of your schema by default, set your schemas toJSON option to the same argument.doc.set('documents.0.title', 'changed'); doc.isModified() // true doc.isModified('documents') // true doc.isModified('documents.0.title') // true doc.isModified('documents otherProp') // true doc.isDirectModified('documents') // false Document.prototype.isNewType:«property»Boolean flag specifying if the document is new.Called internally after a document is returned from mongodb. Normally, you do not need to call this function on your own.
doc.foo = 'bar'; doc.unmarkModified('foo'); doc.save(); // changes to foo will not be persisted Document.prototype.update()Parametersdoc «Object» options «Object» callback «Function» Returns:«Query» Sends an update command with this document _id as the query selector. $ npm install mongoose. Now say we like fuzzy kittens and want to record every kitten we ever meet in MongoDB. The first thing we need to do is include mongoose in our project and open a connection to.. Returns the list of paths that have been directly modified. A direct modified path is a path that you explicitly set, whether via doc.foo = 'bar', Object.assign(doc, { foo: 'bar' }), or doc.set('foo', 'bar'). We will then create the mongoose Model by calling mongoose.model. We can also do more with this like creating specific methods. Be sure to take a look at the mongoose docs for more information
Mongoose OS quick start quide. A 12-minute guide to turn your device into a mobile-controllable Mongoose OS uses mos tool for various tasks: building firmware, flashing firmware, managing device.. weirdCar.update({$inc: {wheels:1}}, { w: 1 }, callback); Valid options: same as in Model.update Document.prototype.updateOne()Parametersdoc «Object» [options] «Object» optional see Query.prototype.setOptions()
