Use Snippets in the Console (original) (raw)
Warning
This feature is experimental. MongoDB does not provide support for Snippets. This feature may be changed or removed at any time without prior notice.
Bugs are not expected, however should you encounter one, please open an issue in theGitHub repositoryfor this project.
This page is an overview of working with snippets in themongosh console.
You must install a snippet package before you use it. Once a snippet package has been installed, it is loaded each timemongosh starts.
If you know the name of the snippet you want to install, enter:
Otherwise, search the repository to get a list of available snippets.
Once the snippet is installed, enter y to load it.
Running install...
Installed new snippets analyze-schema. Do you want to load them now? [Y/n]: y
Finished installing snippets: analyze-schema
Note
If this is the first time you have used snippets you may see a warning like the following:
This operation requires downloading a recent release of npm. Do
you want to proceed? [Y/n]:
You must install npm to use snippets.
Before running a new snippet, run snippet help <SNIPPET NAME> to learn more about the snippet's functionality.
For example, snippet help analyze-schema indicates that you can use the the analyze-schema by passing it a collection name.
testDB> snippet help analyze-schema
# analyze-schema
Analyze the schema of a collection or a cursor.
```js
> schema(db.coll);
┌─────────┬───────┬───────────┬────────────┐
│ (index) │ 0 │ 1 │ 2 │
├─────────┼───────┼───────────┼────────────┤
│ 0 │ '_id' │ '100.0 %' │ 'ObjectID' │
│ 1 │ 'a ' │ '50.0 %' │ 'Number' │
│ 2 │ 'a ' │ '50.0 %' │ 'String' │
└─────────┴───────┴───────────┴────────────┘
Once you know how to call a snippet, you can use it as in the following example.
Consider the reservations collection:
db.reservations.insertMany( [
{"_id": 1001, "roomNum": 1, "reserved": true },
{"_id": 1002, "roomNum": 2, "reserved": true },
{"_id": 1003, "roomNum": 3, "reserved": "false" },
{"_id": 1004, "roomNum": 4, "reserved": true },
] )
To analyze the collection, install theanalyze-schema snippet if it is not already present, pass in the collection name to run it.
snippet install analyze-schema
schema(db.reservations)
The document with "_id": 3 was misentered as a string. The analysis shows that the reserved field has string elements in addition to the expected booleans.
┌─────────┬────────────┬───────────┬───────────┐
│ (index) │ 0 │ 1 │ 2 │
├─────────┼────────────┼───────────┼───────────┤
│ 0 │ '_id ' │ '100.0 %' │ 'Number' │
│ 1 │ 'reserved' │ '75.0 %' │ 'Boolean' │
│ 2 │ 'reserved' │ '25.0 %' │ 'String' │
│ 3 │ 'roomNum ' │ '100.0 %' │ 'Number' │
└─────────┴────────────┴───────────┴───────────┘
Use the snippet uninstall command to remove a snippet. If you are unsure of the name, the snippet ls command lists all installed snippets.
This code uninstalls the analyze-schema snippet.
snippet uninstall analyze-schema
The snippet ls command returns a list of locally installed snippets along with some version and source information.
snippets@ /root/.mongodb/mongosh/snippets
├── mongosh:PRIVATE..DecryptCards@1.0.5
├── mongosh:analyze-schema@1.0.5
└── npm@7.23.0
To see the snippets that are available in the registry, firstrefresh the local metadata cache and then search.
snippet refresh
snippet search
snippet search lists available snippets, their version, and gives a brief description.
This instance has a second, private registry configured. Since the private registry was listed first, those snippets precede the MongoDB snippets in the list of available snippets.
┌─────────┬─────────────────────────────────┬─────────┬────────────────────────────────────────────────────────────────┐
│ (index) │ name │ version │ description │
├─────────┼─────────────────────────────────┼─────────┼────────────────────────────────────────────────────────────────┤
│ 0 │ 'PRIVATE..DecryptCards' │ '1.0.5' │ 'Decrypt credit card numbers' │
│ 1 │ 'PRIVATE..updateAuthentication' │ '1.0.2' │ 'Update user pwds and authentication' │
│ 2 │ 'resumetoken' │ '1.0.2' │ 'Resume token decoder script' │
│ 3 │ 'mongocompat' │ '1.0.7' │ 'mongo compatibility script for mongosh' │
│ 4 │ 'spawn-mongod' │ '1.0.1' │ 'Spin up a local mongod process' │
│ 5 │ 'mock-collection' │ '1.0.2' │ 'mockCollection([{ a: 1 }, { a: 2 }]).find({ a: { $gt: 2 } })' │
│ 6 │ 'analyze-schema' │ '1.0.5' │ 'schema(db.coll)' │
└─────────┴─────────────────────────────────┴─────────┴────────────────────────────────────────────────────────────────┘
Display the homepage and URL for each snippet repository:
The output lists each repository.
Snippet repository URL: https://compass.mongodb.com/mongosh/snippets-index.bson.br
--> Homepage: https://github.com/mongodb-labs/mongosh-snippets
Each snippet is unique and has its own interface. The best way to find information about how a particular snippet works is to view itsREADME file by running snippet help:
This command displays the README file for the mongocompatsnippet in the mongosh console.
# mongocompat
Provide `mongo` legacy shell compatibility APIs.
```js
> Array.sum([1, 2, 3])
6
> tojsononeline({a:1,b:2,c:3})
{ "a" : 1, "b" : 2, "c" : 3 }
```
When you create your own your own snippet packages, be sure to include a README.md file that provides useful help.