Find one mongoose

Mongoose models provide several static helper functions for CRUD operations. Each of these functions returns a mongoose Query object. A mongoose query can be executed in one of two ways.

Query constructor used for building queries. You do not need to instantiate a Query directly. Instead use Model functions like Model. Be sure to read about all of its caveats before using. Setting this option is a no-op for MongoDB 4.

Find one mongoose

This page documents a mongosh method. This is not the documentation for database commands or language-specific drivers, such as Node. For the database command, see the find command. For the legacy mongo shell documentation, refer to the documentation for the corresponding MongoDB Server release:. Returns one document that satisfies the specified query criteria on the collection or view. If multiple documents satisfy the query, this method returns the first document according to the natural order which reflects the order of documents on the disk. In capped collections , natural order is the same as insertion order. If no document satisfies the query, the method returns null. If you specify a projection parameter, findOne returns a document that only contains the projection fields. Although similar to the find method, the findOne method returns a document rather than a cursor. You can use db. The findOne method has the following form:. The findOne method takes the following parameters:. Specifies additional options for the query. These options modify query behavior and how results are returned.

This property is read-only. Gets query options.

Mongoose models provide several static helper functions for CRUD operations. Each of these functions returns a mongoose Query object. A mongoose query can be executed in one of two ways. First, if you pass in a callback function, Mongoose will execute the query asynchronously and pass the results to the callback. When executing a query, you specify your query as a JSON document.

The findOne function is used to find one document according to the condition. If multiple documents match the condition, then it returns the first document satisfying the condition. Step 1: You can visit the link Install Mongoose module. You can install this package by using this command. Step 2: After installing the mongoose module, you can check your mongoose version in the command prompt using the command. The updated dependencies in package. Example: Below the code example for the findOne method:. Below is the sample data in the database before the function is executed. So this is how you can use the mongoose findOne function that finds one document according to the condition.

Find one mongoose

Mongoose is a popular Node. One of its fundamental database query functions is findOne , which retrieves a single document from the database matching the given criteria. The purpose of findOne is to find the first document that matches the specified query criteria. If no document is found, it returns null. The function returns a query instance, which can be executed with a promise or by passing a callback. This example shows how to use the projection parameter to return only specific fields of the document.

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The supported operations are:. Finds a matching document, removes it, and returns the found document if any. In general, you should use queries where possible, and only use aggregate when you absolutely need to. This is not the documentation for database commands or language-specific drivers, such as Node. If you specify a non-zero integer for the projection value, the operation treats the value as true. React Bootstrap Tutorial. In that case, just use Model. In general, you should use queries where possible, and only use aggregate when you absolutely need to. Determines the MongoDB nodes from which to read. Will either be 0 or 1. Returns a string representation of this query. Improve Improve.

The findOneAndUpdate function in Mongoose has a wide variety of use cases. You should use save to update documents where possible , for better validation and middleware support. However, there are some cases where you need to use findOneAndUpdate.

The find and findAndModify projection can accept aggregation expressions and syntax. The createIndex commands are sent in series. Skip to content. In capped collections , natural order is the same as insertion order. The return value of the function will be emitted on data and returned by. Returns a string representation of this query. Create a collection cakeFlavors :. To change this behavior, see Query. The projection parameter determines which fields are returned in the matching documents. You do not need to instantiate a Query directly. Behaves like remove , but deletes at most one document regardless of the single option. We use cookies to ensure you have the best browsing experience on our website. Shortcut for saving one or more documents to the database. If this flag is not null or undefined, the exec promise will reject without executing.