Findmany in mongoose
When working with databases, data retrieval is the most used operation of all the CRUD operations. When working with mongoose and MongoDB, documents of a collection can be retrieved using various methods. In this article, we will discuss such methods of retrieving documents from a collection in MongoDB. And we will use the postman tool for executing routes.
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The exports object of the mongoose module is an instance of this class. Most apps will only use this one instance. The Mongoose Decimal SchemaType. Used for declaring paths in your schema that should be bit decimal floating points. Do not use this to create a new Decimal instance, use mongoose.
Decimal instead. The Mongoose Mixed SchemaType. Used for declaring paths in your schema that Mongoose's change tracking, casting, and validation should ignore. The Mongoose Number SchemaType. Used for declaring paths in your schema that Mongoose should cast to numbers. Do not use this to create a new ObjectId instance, use mongoose.
ObjectId instead. The Mongoose module's default connection. Equivalent to mongoose. This is the connection used by default for every model created using mongoose. To create a new connection, use createConnection. An array containing all connections associated with this Mongoose instance.
By default, there is 1 connection. Calling createConnection adds a connection to this array. Each connection instance maps to a single database. This method is helpful when mangaging multiple db connections. Removes the model named name from the default connection, if it exists. You can use this function to clean up any models you created in your tests to prevent OverwriteModelErrors. The underlying driver this Mongoose instance uses to communicate with the database.
A driver is a Mongoose-specific interface that defines functions like find. Models defined on the mongoose instance are available to all connection created by the same mongoose instance.
If you call mongoose. When no collection argument is passed, Mongoose uses the model name. If you don't like this behavior, either pass a collection name, use mongoose. The node-mongodb-native driver Mongoose uses. Mongoose uses this function to get the current time when setting timestamps. You may stub out this function using a tool like Sinon for testing. Starts a MongoDB session for benefits like causal consistency, retryable writes , and transactions.
Calling mongoose. Sessions are scoped to a connection, so calling mongoose. When nesting schemas, children in the example above , always declare the child schema first before passing it into its parent. Array of child schemas from document arrays and single nested subdocs and their corresponding compiled models. Each element of the array is an object with 2 properties: schema and model. This property is typically only useful for plugin authors and advanced users. You do not need to interact with this property at all to use mongoose.
Returns a list of indexes that this schema declares, via schema. Loads an ES6 class into a schema. NOTE: Schema. You can also add instance methods directly to the Schema. The paths defined on this schema. The keys are the top-level paths in this schema, and the values are instances of the SchemaType class. This method is analagous to Lodash's pick function for Mongoose schemas.
Keys in this object are names that are rejected in schema declarations because they conflict with Mongoose functionality. If you create a schema using new Schema with one of these property names, Mongoose will throw an error.
NOTE: Use of these terms as method names is permitted, but play at your own risk, as they may be existing mongoose document methods you are stomping on.
Helper for createCollection. Will explicitly create the given collection with specified options. Used to create capped collections and views from mongoose. Options are passed down without modification to the MongoDB driver's createCollection function. Removes the model named name from this connection, if it exists. Helper for dropCollection.
Will delete the given collection, including all documents and indexes. Helper for dropDatabase. Deletes the given database, including all collections, documents, and indexes. The host name portion of the URI. If multiple hosts, such as a replica set, this will contain the first host name in the URI. A number identifier for this connection. Used for debugging when you have multiple connections.
When no collection argument is passed, Mongoose produces a collection name by passing the model name to the utils. This method pluralizes the name. If you don't like this behavior, either pass a collection name or set your schemas collection name option.
A POJO containing a map from model names to models. Contains all models that have been added to this connection using Connection model. The port portion of the URI. If multiple hosts, such as a replica set, this will contain the port from the first host name in the URI.
Sets the value of the option key. Equivalent to conn. Watches the entire underlying database for changes. Similar to Model. This function does not trigger any middleware.
In particular, it does not trigger aggregate middleware. 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. Empty object that you can use for storing properties on the document. This is handy for passing data to middleware without conflicting with Mongoose internals.
A string containing the current operation that Mongoose is executing on this document. May be null , 'save' , 'validate' , or 'remove'. Used to automatically set session if you save a doc that you got from a query with an associated session.
Returns the list of paths that have been directly modified. A direct modified path is a path that you explicitly set, whether via doc. A path a may be in modifiedPaths but not in directModifiedPaths because a child of a was directly modified. 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. Called internally after a document is returned from mongodb. Normally, you do not need to call this function on your own.
This function triggers init middleware. Note that init hooks are synchronous. The value argument if passed will be available through the ValidationError. If path is given, checks if a path or any full path containing path as part of its path chain has been modified.
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. Populates document references, executing the callback when complete.
If you want to use promises instead, use this function with execPopulate. Population does not occur unless a callback is passed or you explicitly call execPopulate.
Find By ID in Mongoose
Packt Publishing Amazon. Mongoose for Application Development. Simon Holmes. This book is a mini tutorial full of code examples and strategies to give you plenty of options when building your own applications with MongoDB.
There's some confusion on the internet about what happens when you call Model. Make no mistake, Model. But there's some confusion about Model. In this article, I'll provide a conceptual overview of what happens when you call Model.
How find() Works in Mongoose
GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. This is a plugin for graphql-compose , which derives GraphQLType from your mongoose model. Also derives bunch of internal GraphQL Types. Modules graphql , graphql-compose , mongoose are in peerDependencies , so should be installed explicitly in your app. They have global objects and should not have ability to be installed as submodule. That's all! You think that is to much code? I don't think so, because by default internally was created about 55 graphql types for input, sorting, filtering. So you will need much much more lines of code to implement all these CRUD operations by hands. Suppose you User model has friendsIds field with array of user ids.
Mongoose Find All
The exports object of the mongoose module is an instance of this class. Most apps will only use this one instance. The Mongoose Decimal SchemaType.