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https://github.com/serby/save

A simple CRUD based persistence abstraction for storing objects to any backend data store. eg. Memory, MongoDB, Redis, CouchDB, Postgres, Punch Card etc.
https://github.com/serby/save

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A simple CRUD based persistence abstraction for storing objects to any backend data store. eg. Memory, MongoDB, Redis, CouchDB, Postgres, Punch Card etc.

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# save - A simple CRUD based persistence abstraction for storing objects to any backend data store. eg. Memory, MongoDB, Redis, CouchDB, Postgres, Punch Card etc.



[![NPM Details](https://nodei.co/npm/save.png?stars&downloads)](https://npmjs.org/package/save)



[![build status](https://api.travis-ci.org/serby/save.png)](http://travis-ci.org/serby/save) [![Dependences](https://david-dm.org/serby/save.svg)](https://david-dm.org/serby/save/) [![Join the chat at https://gitter.im/serby/save](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/serby/save?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)



**save** comes with a fully featured in memory engine which is super handy for testing your models.

For real world use you'll need to get one of the database powered engines:



* [MongoDB](https://github.com/serby/save-mongodb)



If your data store of choice isn't listed here please create an engine and send me a pull request.

To see an example of how to create an engine, please see [save-mongodb](https://github.com/serby/save-mongodb).



## Installation



    npm install save



## Example



```js



var save = require('save')

  , s = save('person')



s.on('create', function() {

  console.log('New person created!')

})



s.create({ name: 'Dom' }, function(err, person) {

  // Outputs { name: 'Dom', _id: 1 }

  console.log(person)

})



```



## Usage



```js

var save = require('save')

```



### var s = save(name, [options])

Save by default returns an in memory engine which means you can unit test your models independently from your database. `name` is the name of your model.



Possible options are:



* `idProperty`. Defaults to `_id` for mongodb

* `logger`. Defaults to console logging: `{ info: console.info, verbose: console.info }`

* `engine`. Persistence engine to use, defaults to memory engine: `require(./memory-engine)`



### s.create(object, [cb])

Creates a new entity.

`cb` called with `cb(err, savedObject)`.



### s.read(id, [cb])

Reads a single entity with an `idProperty` of `id`.

`cb` called with `cb(err, readObject)`.



### s.update(object, overwrite, [cb])

Updates a single entity. Optionally overwrites the entire entity, by default just extends it with the new values.

`cb` called with `cb(err, readObject)`.



### s.delete(id, [cb])

Deletes one entity.

Returns an error if the object can not be found.

`cb` called with `cb(err)`.



### s.deleteMany(query, [cb])

Deletes entities based on a query.

Performs a find by query, then calls delete for each item returned

Returns an error if no items match the query.

`cb` called with `cb(err)`.



### s.find(query, options, cb)

Performs a find on the data.

`cb` called with `cb(err, foundObjectsArray)`.



### s.findOne(query, options, cb)

Performs a find on the data and limits the result set to 1.

`cb` called with `cb(err, foundObject)`.



### s.count(query, cb)

Performs a count by query.

`cb` called with `cb(err, count)`.



### s.idProperty

Provides access to the `idProperty`. Mostly used for testing.



## Events



### s.on('create', cb)

This event fires with `cb(object)` where `object` is the item that will be created.



### s.on('afterCreate', cb)

This event fires with `cb(object)` where `object` is the item that has been created.



### s.on('update', cb)

This event fires with `cb(object, overwrite)` where `object` is the item that will be updated and `overwrite` is whether the object is to be overwritten or extended.



### s.on('afterUpdate', cb)

This event fires with `cb(object, overwrite)` where `object` is the item that has been updated and `overwrite` is whether the object is to be overwritten or extended.



### s.on('delete', cb)

This event fires with `cb(id)` where `id` is the item that will be deleted.



### s.on('afterDelete', cb)

This event fires with `cb(id)` where `id` is the item that has been deleted.



### s.on('deleteMany', cb)

This event fires with `cb(query)` where `query` is the query used to `deleteMany`.



### s.on('afterDeleteMany', cb)

This event fires with `cb(query)` where `query` is the query that has used `deleteMany`.



### s.on('read', cb)

This event fires with `cb(id)` where `id` is the item that has been read.



### s.on('find', cb)

This event fires with `cb(query)` where `query` is the query used to `find`.



### s.on('findOne', cb)

This event fires with `cb(query)` where `query` is the query used to `findOne`.



### s.on('count', cb)

This event fires with `cb(query)` where `query` is the query used to `count`.



### s.on('error', cb)

This event fires with `cb(err)` where `err` is any error that may have occured.



## Credits

[Paul Serby](https://github.com/serby/) follow me on twitter [@serby](http://twitter.com/serby)



[Dom Harrington](https://github.com/domharrington/)



## Licence

Licenced under the [New BSD License](http://opensource.org/licenses/bsd-license.php)