Database API

The database API lets you execute queries and manipulate data in the built in NoSQL datastore.

API quick overview

• Datastore.open()
• insertOne(collection, document)
• getOne(collection, ID)
• findOne(collection, ID)
• find(collection, options)
• getMany(collection, options)
  • Simple code example
  • Advanced code example
  • Streaming data code example
• getArray(collection, options)
• updateOne(collection, ID, document)
• updateMany(collection, document, options)
• replaceOne(collection, ID, document)
• replaceMany(collection, document, options)
• removeOne(collection, ID)
• removeMany(collection, options)

Datastore.open()

Datastore.open() opens a connection to a datastore in the active project space.

import {Datastore} from 'codehooks-js'

async function myfunc() {
    const conn = await Datastore.open();
    // use conn to call API functions
    ...
}

Returns Promise / Datastore connection

insertOne(collection, document)

Insert a new data object into a collection in a datastore.

Parameters

• collection: collection name
• document: JSON document or array of JSON documents

Returns Promise with the new JSON document and an unique _id value.

Code example

import {app, Datastore} from 'codehooks-js'

async function createSale(req, res) {
    const conn = await Datastore.open();    
    const doc = await conn.insertOne('sales', req.body);  
    // return new document to client
    res.status(201).json(doc);
}
// Serverless route hook
app.post('/sales', createSale);

export default app.init(); // Bind functions to the serverless runtime

Example input and result

POST
https://myproject-ff00.api.codehooks.io/dev/sales

Example input:
{
    "Region": "North America",
    "Item Type": "Cereal",
    "Volume": 200
}

getOne(collection, ID)

Get one data object by ID from a collection in a datastore.

Parameters

• collection: name of collection
• ID: the _id value, or Array of _id values

Returns Promise with json document

Code example

import {app, Datastore} from 'codehooks-js'

async function getOne(req, res) {
    const conn = await Datastore.open();
    const id = {req.params};
    const data = await conn.getOne('customer', id);
    res.json(data)
}
// Serverless route hook
app.get('/cust/:id', getOne);

export default app.init(); // Bind functions to the serverless runtime

Example input and result

GET
https://myproject-ff00.api.codehooks.io/dev/cust/640f60f2b4fdc00015c42811

Example output:
{
    "name": "Acme Inc.",
    _id: "640f60f2b4fdc00015c42811"
}

findOne(collection, ID)

Alias for getOne

find(collection, options)

Alias for getMany

getMany(collection, options)

Stream multiple data objects from a collection in a datastore. Data are sorted naturally by the index for the collection, default index is by _id which will stream data in chronological order.

Parameters

• collection: collection name (mandatory)
• options (optional settings for indexes and filtering)
  • filter : mongoDB query object. e.g. {name: "Jane"} (Read query language docs)
  • sort: mongoDB sort object. E.g. sort by name ascending {"name": 1}
  • useIndex: indexed field name
    • Indexes are created with CLI, e.g. coho createindex -c sales -i Region
  • startIndex: jump into the index
  • endIndex: where to end in the index
  • limit: how many items to return
  • hints: include or omit fields
    • Include fields example: {$fields: {name: 1, address: 1}}
    • Omit fields example: {$fields: {name: 0, _id_: 0}}
  • offset: how many items to skip before returning any
  • reverse: reverese scan of index, i.e. descending sort

Returns a JSON array data stream.

Simple code example

import {app, Datastore} from 'codehooks-js'

async function getSales(req, res) {
    const conn = await Datastore.open();    
    conn.getMany('sales').json(res);  
}
// Serverless route hook
app.get('/sales', getSales);

export default app.init(); // Bind functions to the serverless runtime

Example input and result

GET
https://myproject-ff00.api.codehooks.io/dev/sales

Example output:
[
{
    "Region": "France",
    "Item Type": "Veal",
    "Volume": 130,
    "Unit Price": 2005.7,
    "Unit Cost": 11s7.11,
    "_id": "640f60e2b4fdc00015c4280f"
},
{
    "Region": "Germany",
    "Item Type": "Haxe",
    "Volume": 30,
    "Unit Price": 30.4,
    "Unit Cost": 32.43,
    "_id": "640f60e2b4fdc00015c4282f"
}
]

Advanced code example

import {app, Datastore} from 'codehooks-js'

async function getSales(req, res) {
    const conn = await Datastore.open();
    const options = {
        useIndex: "Region",
        startIndex, "North America",
        limit: 1000,
        hints: {$fields: {hidden: 0, _id: 0}},
        filter: {"Volume": {$gt: req.params.vol}}
    }    
    conn.getMany('sales', options).json(res);  
}
// Serverless route hook
app.get('/sales/:vol', getSales);

export default app.init(); // Bind functions to the serverless runtime

Example input and result

GET
https://myproject-ff00.api.codehooks.io/dev/sales/1000

Example output:
[
{
    "Region": "North America",
    "Item Type": "Cereal",
    "Volume": 1304,
    "Unit Price": 205.7,
    "Unit Cost": 117.11
},
{
    "Region": "North America",
    "Item Type": "Cereal",
    "Volume": 1306,
    "Unit Price": 10.3,
    "Unit Cost": 3.3
}
]

Streaming data code example

import {app, Datastore} from 'codehooks-js'

async function getSales(req, res) {
    const conn = await Datastore.open();    
    let count = 0;
    conn.find('sales') 
    .on('data', (item) => {
      // emit one data item from stream
      // use the response.write to stream data back to client
      res.write(`Item ${count++} has volume ${item.Volume}\n`)
    })
    .on('end', () => {
      // end of data stream, close client request
      res.end()
    })
}
// Serverless route hook
app.get('/sales', getSales);

export default app.init(); // Bind functions to the serverless runtime

Output from the streaming data code example:

Item 0 has volume 1304
Item 1 has volume 1306
...

getArray(collection, options)

Return multiple data objects as an array of objects.

Use same parameters as the getMany function.

Simple code example

import {app, Datastore} from 'codehooks-js'

async function getSales(req, res) {
    const conn = await Datastore.open();    
    const query = {"product": "foo"};
    const data = await conn.getArray('sales', {filter: query});  
    // return json array
    res.json(data);
}
// Serverless route hook
app.get('/sales', getSales);

export default app.init(); // Bind functions to the serverless runtime

updateOne(collection, ID, document)

Update one data object by ID in a datastore collection. Input document is patched with the matched database object.

Parameters

• collection: name of collection
• ID: the _id value
• document: new json document to update or manipulate

Returns Promise with updated json document

Code example

import {app, Datastore} from 'codehooks-js'

async function myFunc(req, res) {
    const conn = await Datastore.open();
    const data = await conn.updateOne('customer', req.params.id, req.body);
    res.json(data);
}
// Serverless route hook
app.put('/cust/:id', myFunc);

export default app.init(); // Bind functions to the serverless runtime

Example input and result

POST
https://myproject-ff00.api.codehooks.io/dev/cust/640f60f2b4fdc00015c42811

Example input:
{
    "name": "Acme Inc.",
    "sales": 42
}

updateMany(collection, document, options)

Update multiple data objects in a datastore collection. Input document is patched with the matched database objects.

Parameters

• collection: name of collection
• document: new json document to update or manipulate
• options (optional settings for indexes and filtering)
  • filter: mongoDB query object (docs)
  • useIndex: use field index
  • startIndex: jump into the index
  • endIndex: where to end in the index

Returns Promise with count of objects updated

Code example

import {app, Datastore} from 'codehooks-js'

async function myFunc(req, res) {
    const conn = await Datastore.open();
    const options = {
        filter: {"customerStatus": "GOLD"}
    }
    const doc = {
        $inc: {"bonus": "20"}, 
        $set: {customerStatus: "PLATINUM"}
    };
    const data = await conn.updateMany('customer', doc, options);
    res.json(data);
}
// Serverless route hook
app.put('/cust', myFunc);

export default app.init(); // Bind functions to the serverless runtime

Example input and result

PUT
https://myproject-ff00.api.codehooks.io/dev/cust

Example output:
[
    {
    "name": "Acme Inc.",
    "customerStatus": "PLATINUM",
    "bonus": "20",
    _id: "640f60f2b4fdc00015c42811"
    },
    {
    "name": "Colo Inc.",
    "customerStatus": "PLATINUM",
    "bonus": "30",
    _id: "640f60f2b4fdc00015c42f00"
    },
    ...
]

replaceOne(collection, ID, document)

Replace one data object by ID in a datastore collection. Input document overwrites the matched database object, the _id value is not overwritten.

Parameters

• collection: name of collection
• ID: the _id value
• document: new json document to replace

Returns Promise with updated json document

Code example

import {app, Datastore} from 'codehooks-js'

async function myFunc(req, res) {
    const conn = await Datastore.open();
    const data = await conn.replaceOne('customer', req.params.id, req.body);
    res.json(data);
}
// Serverless route hook
app.put('/cust/:id', myFunc);

export default app.init(); // Bind functions to the serverless runtime

Example input and result

POST
https://myproject-ff00.api.codehooks.io/dev/cust/640f60f2b4fdc00015c42811

Example input:
{
    "name": "Acme Replacement Inc.",
    "sales": 0
}

replaceMany(collection, document, options)

Replace multiple data objects in a datastore collection. Input document overwrites the matched database objects. The _id value is not overwritten.

Parameters

• collection: name of collection
• document: new json document to replace
• options (optional settings for indexes and filtering)
  • filter: mongoDB query object (docs)
  • useIndex: use field index
  • startIndex: jump into the index
  • endIndex: where to end in the index

Returns Promise with count of objects updated

Code example

import {app, Datastore} from 'codehooks-js'

async function myFunc(req, res) {
    const conn = await Datastore.open();
    const options = {
        filter: {"customerStatus": "GOLD"}
    }
    const doc = {
        "Acme": "was here"
    };
    const data = await conn.replaceMany('customer', doc, options);
    res.json(data);
}
// Serverless route hook
app.put('/cust', myFunc);

export default app.init(); // Bind functions to the serverless runtime

Example input and result

PUT
https://myproject-ff00.api.codehooks.io/dev/cust

Example output:
[
    {
    "Acme": "was here"
    _id: "640f60f2b4fdc00015c42811"
    },
    {
    "Acme": "was here"
    _id: "640f60f2b4fdc00015c400fe"
    },
    ...
]

removeOne(collection, ID)

Remove one data object by ID in a datastore collection.

Parameters

• collection: name of collection
• ID: the _id value

Returns Promise with document ID

Code example

import {app, Datastore} from 'codehooks-js'

async function myFunc(req, res) {
    const conn = await Datastore.open();
    const data = await conn.removeOne('customer', req.params.id);
    res.json(data);
}
// Serverless route hook
app.delete('/cust/:id', myFunc);

export default app.init(); // Bind functions to the serverless runtime

Example input and result

DELETE
https://myproject-ff00.api.codehooks.io/dev/cust/640f60f2b4fdc00015c42811

Example output:
640f60f2b4fdc00015c42811

removeMany(collection, options)

Remove multiple data objects in a datastore collection.

Parameters

• collection: name of collection
• options (optional settings for indexes and filtering)
  • filter: mongoDB query object (docs)
  • useIndex: use field index
  • startIndex: jump into the index
  • endIndex: where to end in the index

Returns Promise with count of objects deleted

Code example

import {app, Datastore} from 'codehooks-js'

async function myFunc(req, res) {
    const conn = await Datastore.open();
    const options = {
        filter: {"customerStatus": "GOLD"}
    }
    const data = await conn.removeMany('customer', options);
    res.json(data);
}
// Serverless route hook
app.delete('/cust', myFunc);

export default app.init(); // Bind functions to the serverless runtime

Example input and result

DELETE
https://myproject-ff00.api.codehooks.io/dev/cust

Example output:
{"count": 3}