MongoDB cheat sheet

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Here is a cheat sheet for mongodb

Basic Idea

Database: A container of collection.
Collection: Grouping of documents insida of a database. Similar tables in SQL.
Document: A record inside of a collection. Similar to row in SQL.
Field: A key value pair within a document. Similar to column in SQL.

Basic commands

mongosh: A JavaScript shell for interacting with MongoDB instances. It provides a command-line interface (CLI) that allows you to connect to a MongoDB server.
show dbs: Shows all databases in the current MongoDB instance.
use <dbname>: Switch database provided by dbname.
db: Shows current database name.
show collections: Shows all collections.
db.dropDatabase(): Deletes the current database.
exit: Exits the mongosh session.

Create

insertOne: Creates a document within the specified collection.

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insertMany: Creates multiple documents within the specified collection.

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Read

find: Get all documents.

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find(<filterObject>): Find all documents based on the filter object

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find(<filterObject>, <selectObject>): Find all documents that match the filter object but only return the field specified in the select object

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findOne: Returns the first document that matches the filter object.

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countDocuments: Returns the count of the documents that match the filter object.

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Update

updateOne: Updates the first document.

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updateMany: Updates multiple docments.

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replaceOne: Replace the first document. This
will completely overwrite the entire object and not just
update individual fields.

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Delete

deleteOne: Delete a single document from a collection.

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deleteMany: Delete multiple documents from a collection.

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Complex Filter Object

$eq: equals.

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$ne: not equal to.

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$gt / $gte: Greater than and greater than or eqal.

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$lt / $lte: Less than and less than or eqal.

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$in: Check if a value is one of many values.

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$nin: Check if a value is none of many values.

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$and: Returns true if all expressions are true

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$or: returns true if any expression is true

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$not: Negates the expression

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$exists: Matches documents that have the specified field.

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$expr: performs an expression evaluation in the query.

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Complex Update Object

$set: Updates only the fields passed to $set.

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$inc: Increments the value of a field by a specified amount.

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$rename: Rename a field

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$unset: Remove a field.

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$push: Adds new elements to an array

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$pull: Rmoves all array elements that match a specified condition.

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Modifiers for read

sort: Sort the results of a find by the given fields.

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limit: Returns a specified number of documents.

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skip: Skip a specified number of documents from the start.

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Source: https://dev.to/arafat4693/mongodb-cheat-sheet-2f9o

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