refactor

technology/applications/MongoDB.md

@@ -3,8 +3,8 @@ website: https://www.mongodb.com
 obj: application
 ---
 
-#wip #🐇 #notnow 
-MongoDB is a popular NoSQL database that is document-oriented and designed for scalability and flexibility
+# MongoDB
+MongoDB is a popular NoSQL database that is document-oriented and designed for scalability and flexibility. You can work with MongoDB in a GUI with [MongoDB Compass](MongoDB%20Compass.md).
 
 ## Docker-Compose
 ```yml
@@ -12,13 +12,12 @@ version: '3'
 services:
   mongo:
     image: mongo
-    container_name: mongo
     restart: always
     environment:
       MONGO_INITDB_ROOT_USERNAME: root
       MONGO_INITDB_ROOT_PASSWORD: password
     volumes:
-      - mongodb_data:/data/db
+      - ./db:/data/db
     ports:
       - "27017:27017"
 ```
@@ -63,23 +62,29 @@ To delete multiple documents: `db.<collection>.deleteMany(<filter>)`
 To delete all documents in a collection: `db.<collection>.deleteMany({})`
 
 ### Filters
-- $eq: The $eq operator matches documents where the value of a field equals a specified value.
-- $ne: The $ne operator matches documents where the value of a field is not equal to a specified value.
-- $gt: The $gt operator matches documents where the value of a field is greater than a specified value.
-- $gte: The $gte operator matches documents where the value of a field is greater than or equal to a specified value.
-- $lt: The $lt operator matches documents where the value of a field is less than a specified value.
-- $lte: The $lte operator matches documents where the value of a field is less than or equal to a specified value.
-- $in: The $in operator matches documents where the value of a field equals any value in a specified array.
-- $nin: The $nin operator matches documents where the value of a field does not equal any value in a specified array.
-- $and: The $and operator performs a logical AND operation on an array of two or more expressions and selects the documents that satisfy all the expressions.
-- $or: The $or operator performs a logical OR operation on an array of two or more expressions and selects the documents that satisfy at least one of the expressions.
-- $not: The $not operator performs a logical NOT operation on the specified expression and selects the documents that do not match the expression.
-- $exists: The $exists operator matches documents where a specified field exists or does not exist.
-- $type: The $type operator matches documents where a specified field has a specific BSON type.
-- $regex: The $regex operator matches documents where a specified field matches a regular expression.
-- $text: The $text operator performs a text search on the specified field(s).
-- $elemMatch: The $elemMatch operator matches documents where a specified array field contains at least one element that matches all the specified conditions.
-- $size: The $size operator matches documents where a specified array field has a specific size.
+Usage:
+```json
+{ "field": { "$mod": "value" } }
+```
+
+- `$eq`: The `$eq` operator matches documents where the value of a field equals a specified value.
+- `$ne`: The `$ne` operator matches documents where the value of a field is not equal to a specified value.
+- `$gt`: The `$gt` operator matches documents where the value of a field is greater than a specified value.
+- `$gte`: The `$gte` operator matches documents where the value of a field is greater than or equal to a specified value.
+- `$lt`: The `$lt` operator matches documents where the value of a field is less than a specified value.
+- `$lte`: The `$lte` operator matches documents where the value of a field is less than or equal to a specified value.
+- `$in`: The `$in` operator matches documents where the value of a field equals any value in a specified array.
+- `$nin`: The `$nin` operator matches documents where the value of a field does not equal any value in a specified array.
+- `$and`: The `$and` operator performs a logical AND operation on an array of two or more expressions and selects the documents that satisfy all the expressions.
+- `$or`: The `$or` operator performs a logical OR operation on an array of two or more expressions and selects the documents that satisfy at least one of the expressions.
+- `$not`: The `$not` operator performs a logical NOT operation on the specified expression and selects the documents that do not match the expression.
+- `$exists`: The `$exists` operator matches documents where a specified field exists or does not exist.
+- `$type`: The `$type` operator matches documents where a specified field has a specific [BSON](../files/BSON.md) type.
+- `$regex`: The `$regex` operator matches documents where a specified field matches a [regular expression](../tools/Regex.md).
+- `$text`: The `$text` operator performs a text search on the specified field(s).
+- `$elemMatch`: The `$elemMatch` operator matches documents where a specified array field contains at least one element that matches all the specified conditions.
+- `$size`: The `$size` operator matches documents where a specified array field has a specific size.
+- `$exists`: The `$exists` operator matches documents that contain or do not contain a specified field, including documents where the field value is `null`.
 
 **Example:**
 ```js
@@ -94,20 +99,19 @@ db.users.find(
 ```
 
 ### Update Modifiers
-- $set: The $set operator updates the value of a field in a document.
-- $unset: The $unset operator removes a field from a document.
-- $inc: The $inc operator increments the value of a field in a document.
-- $mul: The $mul operator multiplies the value of a field in a document.
-- $min: The $min operator updates the value of a field in a document if the new value is lower than the existing value.
-- $max: The $max operator updates the value of a field in a document if the new value is higher than the existing value.
-- $rename: The $rename operator renames a field in a document.
-- $addToSet: The $addToSet operator adds a value to an array field in a document if the value does not already exist in the array.
-- $push: The $push operator appends a value to an array field in a document.
-- $pull: The $pull operator removes a value from an array field in a document.
-- $currentDate: The $currentDate operator sets the value of a field in a document to the current date and time.
-- $each: The $each operator can be used with $addToSet and $push to append multiple values to an array field in a document.
-- $sort: The $sort operator can be used with $push to sort the elements in an array field in a document.
-- $addToSet: Add an element to an array
+- `$set`: The `$set` operator updates the value of a field in a document.
+- `$unset`: The `$unset` operator removes a field from a document.
+- `$inc`: The `$inc` operator increments the value of a field in a document.
+- `$mul`: The `$mul` operator multiplies the value of a field in a document.
+- `$min`: The `$min` operator updates the value of a field in a document if the new value is lower than the existing value.
+- `$max`: The `$max` operator updates the value of a field in a document if the new value is higher than the existing value.
+- `$rename`: The `$rename` operator renames a field in a document.
+- `$addToSet`: The `$addToSet` operator adds a value to an array field in a document if the value does not already exist in the array.
+- `$push`: The `$push` operator appends a value to an array field in a document.
+- `$pull`: The `$pull` operator removes a value from an array field in a document.
+- `$currentDate`: The `$currentDate` operator sets the value of a field in a document to the current date and time.
+- `$each`: The `$each`¥ operator can be used with `$addToSet` and `$push` to append multiple values to an array field in a document.
+- `$sort`: The `$sort` operator can be used with `$push` to sort the elements in an array field in a document.
 
 **Example:**
 ```js