API FileStore Adapter

Requirements

• DADI API Version 3.0.0 or greater

Install

To use this adapter with your DADI API installation, you'll need to add it to your API's dependencies:

$ npm install @dadi/api-filestore --save

Configure

Configuration Files

Configuration settings are defined in JSON files within a /config directory at the root of your API application. DADI API has provision for multiple configuration files, one for each environment that your API is expected to run under, for example development and production.

A post-install script ran when you installed the package from NPM, creating a development configuration file for you at config/filestore.development.json.

The naming convention for @dadi/api-filestore configuration files follows the format filestore.<environment>.json

For example:

filestore.development.json
filestore.production.json

Application Anatomy

my-api/
  config/            # contains environment-specific configuration properties
    config.development.json
    config.production.json
    filestore.development.json
    filestore.production.json

  main.js            # the entry point of the app
  package.json
  workspace/
    collections/     # collection schema files
    endpoints/       # custom Javascript endpoints

Configuration

The contents of the configuration file should be similar to the following:

{
  "database": {
    "path": "path/to/your/database",
    "autosaveInterval": 10000,
    "serializationMethod": "pretty"
  }
}

Property	Description	Default
path	The relative or absolute path to where your database files will be stored	none
autosaveInterval	The interval, in milliseconds, between database writes to disk	5000 (5 seconds)
serializationMethod	The format of the database file on disk. normal is a condensed version of the JSON, pretty is more readable	normal

Querying Collections

$eq

// explicit
{'Name': { '$eq' : 'Odin' }}

// implicit (assumes equality operator)
{'Name': 'Odin'}

$ne

not equal test

{'legs': { '$ne' : 8 }}

$regex

// pass in raw regex
var results = coll.find({'Name': { '$regex' : /din/ }});

// or pass in string pattern only
results = coll.find({'Name': { '$regex': 'din' }});

// or pass in [pattern, options] string array
results = coll.find({'Name': { '$regex': ['din', 'i'] }});

If using regex operator within a named transform or dynamic view filter, it is best to use the latter two examples since raw regex does not seem to serialize/deserialize well.

$in

var users = db.addCollection("users");
users.insert({ name : 'odin' });
users.insert({ name : 'thor' });
users.insert({ name : 'svafrlami' });

// match users with name in array set ['odin' or 'thor']
{ 'name' : { '$in' : ['odin', 'thor'] } }

$between

// match users with count value between 50 and 75
{ count : { '$between': [50, 75] } }

$contains / $containsAny / $containsNone

var users = db.addCollection("users");
users.insert({ name : 'odin', weapons : ['gungnir', 'draupnir']});
users.insert({ name : 'thor', weapons : ['mjolnir']});
users.insert({ name : 'svafrlami', weapons : ['tyrfing']});
users.insert({ name : 'arngrim', weapons : ['tyrfing']});

// returns 'svafrlami' and 'arngrim' documents
{ 'weapons' : { '$contains' : 'tyrfing' } }

// returns 'svafrlami', 'arngrim', and 'thor' documents
{ 'weapons' : { '$containsAny' : ['tyrfing', 'mjolnir'] } }

// returns 'svafrlami' and 'arngrim'
{ 'weapons' : { '$containsNone' : ['gungnir', 'mjolnir'] } }

Composing Nested Queries

$and

fetch documents matching both sub-expressions

{
  '$and': [{
      'Age' : {
        '$gt': 30
      }
    },{
      'Name' : 'Thor'
    }]
}

$or

fetch documents matching any of the sub-expressions

{
  '$or': [{
      'Age' : {
        '$gte': '40'
      }
    },{
      'Name' : 'Thor'
    }]
}