mongoengine Cheat Sheet

A Programming › Python cheat sheet in English by amicheletti

20,958 views 4,180 downloads 18 Jul 2017 History

PRs

4.3 avg · 1 rating

`mongod`	Start the Database
`mongo`	Start the `mongo command line`
`show dbs`	Show the databases
`use db`	Use the database named `db`
`show collections`	Display the current database `collections`

`db.collection.find()`	Displays documents from `collection` (first 10)
`it`	Iterate the last command
`.find( query [,fields] )`	Find one document by conditions
`.find().limit(n:number)`	Find n documents
`.find().pretty()`	Format results in Mongo Shell
`.find().sort(key:1\|-1)`	Sort by key in ascending (1) or descending (-1) order
`.find().skip(5)`	Skip 5 documents (similar to offset)

`.insert(document(s) [,options])`	Insert a new document or multiple documents(if provided an array of documents) in the collection. Options: writeConcern, ordered
`.insertOne(document, [,options])`
`.insertMany(array of documents, [,options])`
`.update(query, update [,options])`	Update the documents matched by the query. Options: upsert(insert if no match), multi(aply to multiple elements), writeConcern
`.remove(query [,options])`	Remove some documents from a collection. {} for all. options: { justOne, writeConcern }
`.deleteOne(query)`	Same as above
`deleteMany(query)`	Same as above

`from mongoengine import *`
`connect('tumblelog')`	Connect to a database
`class MyDocument(Document)`	Define a Document
`class MyDocument(EmbeddedDocument)`	Define a Document
`obj = MyDocument(field=value)`	Instantiate a Document
`obj.save()`	Save the new Document
--------------------------- Fields ---------------------------
`StringField`	`ListField(type)`
`ReferenceField(document)`	`FloatField`
`EmbeddedDocumentField(document_class)`
http://docs.mongoengine.org/apireference.html#fields
--------------- Field Args ---------------
`required=True`	Optional Argument
`max_length=120`	Optional Argument
`primary_key=True`	Optional Argument
`meta = {'allow_inheritance': True}`
`reverse_delete_rule=CASCADE`
--------------------------- Querying ---------------------------
`MyDocument.objects`	List of documents
`MyDocument.objects(key=value)`	List of Documents with query
`MyDocument.objects.count()`	Count Documents
`MyDocument.objects(key__op=value)`	Query `key` with operator `__op`
http://docs.mongoengine.org/guide/querying.html

Badges

Nice Cheat Sheet Good Cheat Sheet Downloaded from Unusual Locations × 2

No comments yet.