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Introduction

travis npm

Node-viewmodel is a node.js module for multiple databases. It can be very useful if you work with (d)ddd, cqrs, eventdenormalizer, host, etc.

Installation

$ npm install viewmodel

Usage

Connecting to an in-memory repository in read mode

var viewmodel = require('viewmodel');

viewmodel.read(function(err, repository) {
    if(err) {
        console.log('ohhh :-(');
        return;
    }
});

Connecting to any repository (mongodb in the example / mode=write)

Make shure you have installed the required driver, in this example run: 'npm install mongodb'.

var viewmodel = require('viewmodel');

viewmodel.write(
    {
        type: 'mongodb',
        host: 'localhost',      // optional
        port: 27017,            // optional
        dbName: 'viewmodel',    // optional
        timeout: 10000          // optional
        // authSource: 'authedicationDatabase',        // optional
  	    // username: 'technicalDbUser',                // optional
  	    // password: 'secret'                          // optional
        // url: 'mongodb://user:pass@host:port/db?opts // optional
    },
    function(err, repository) {
        if(err) {
            console.log('ohhh :-(');
            return;
        }
    }
);

Catch connect ad disconnect events

var repository = viewmodel.write({ type: 'mongodb' });
repository.on('connect', function() {
    console.log('hello from event');
});
repository.on('disconnect', function() {
    console.log('bye');
});
repository.connect();

Define a collection...

var dummyRepo = repository.extend({
    collectionName: 'dummy'
});

Create a new viewmodel (only in write mode)

dummyRepo.get(function(err, vm) {
    if(err) {
        console.log('ohhh :-(');
        return;
    }

    vm.set('myProp', 'myValue');
    vm.set('myProp.deep', 'myValueDeep');

    console.log(vm.toJSON());

    console.log(vm.has('myProp.deep'));

    dummyRepo.commit(vm, function(err) {
    });
    // or you can call commit directly on vm...
    vm.commit(function(err) {
    });
});

Find...

// the query object ist like in mongoDb...
dummyRepo.find({ color: 'green' }, function(err, vms) {
// or
//dummyRepo.find({ 'deep.prop': 'dark' }, function(err, vms) {
// or
//dummyRepo.find({ age: { $gte: 10, $lte: 20 } }, function(err, vms) {
// or
//dummyRepo.find({ $or: [{age: 18}, {special: true}] }, function(err, vms) {
// or
//dummyRepo.find({ age: { $in: [1, 2, 3, 6] } }, function(err, vms) {
    if(err) {
        console.log('ohhh :-(');
        return;
    }

    // vms is an array of all what is in the repository
    var firstItem = vms[0];
    console.log('the id: ' + firstItem.id);
    console.log('the saved value: ' + firstItem.get('color'));
});

Find with query options

// the query object ist like in mongoDb...
dummyRepo.find({ color: 'green' }, { limit: 2, skip: 1, sort: { age: 1 } }, function(err, vms) {
// or
//dummyRepo.find({ color: 'green' }, { limit: 2, skip: 1, sort: [['age', 'desc']] }, function(err, vms) {
    if(err) {
        console.log('ohhh :-(');
        return;
    }

    // vms is an array of all what is in the repository
    var firstItem = vms[0];
    console.log('the id: ' + firstItem.id);
    console.log('the saved value: ' + firstItem.get('color'));
});

FindOne

// the query object ist like in mongoDb...
dummyRepo.findOne({ color: 'green' }, function(err, vm) {
    if(err) {
        console.log('ohhh :-(');
        return;
    }

    console.log('the id: ' + vm.id);
    if (vm.has('color')) {
        console.log('the saved value: ' + vm.get('color'));
    }
});

Find by id...

// the query object ist like in mongoDb...
dummyRepo.get('myId', function(err, vm) {
    if(err) {
        console.log('ohhh :-(');
        return;
    }

    console.log('the id: ' + vm.id);
    console.log('the saved value: ' + vm.get('color'));
});

Delete a viewmodel (only in write mode)

dummyRepo.get('myId', function(err, vm) {
    if(err) {
        console.log('ohhh :-(');
        return;
    }

    vm.destroy();

    dummyRepo.commit(vm, function(err) {
    });
    // or you can call commit directly on vm...
    vm.commit(function(err) {
    });
});

Obtain a new id

myQueue.getNewId(function(err, newId) {
    if(err) {
        console.log('ohhh :-(');
        return;
    }

    console.log('the new id is: ' + newId);
});

Clear a "collection" (only in write mode)

dummyRepo.clear(function(err) {
    if(err) {
        console.log('ohhh :-(');
        return;
    }
});

Implementation differences

Some implementations support bulkCommit

dummyRepo.bulkCommit([vm1, vm2, vm3], function(err) {
    if(err) {
        console.log('ohhh :-(');
        return;
    }
});

currently supported by:

  • inmemory
  • mongodb
  • elasticsearch6

mongodb

For mongodb you can define indexes for performance boosts in find function.

var dummyRepo = repository.extend({
    collectionName: 'dummy',
    // like that
    indexes: [
        'profileId',
        // or:
        { profileId: 1 },
        // or:
        { index: {profileId: 1}, options: {} }
    ]
    // or like that
    repositorySettings : {
        mongodb: {
            indexes: [ // same as above
                'profileId',
                // or:
                { profileId: 1 },
                // or:
                { index: {profileId: 1}, options: {} }
            ]
        }
    }
});

redis

The find function does ignore the query argument and always fetches all items in the collection.

Elasticsearch >= 5.X

Use the 'elasticsearch6' type for Elasticsearch versions 5.X and 6.X.

The find queries are not mongoDb compatible as the rest of the implementations due to the uneeded overhead and complexity of converting between both formats.

For find queries with elasticsearch6 use elasticsearch native elastic Query DSL;

repository.find( onlyTheQueryClause, otherBodyOptions, callback);

    repository.find(
        {
            range : {
                age : {
                    gte : 10,
                    lte : 20
                }
            }
        ),
        {
            from: 0,
            size: 10,
            sort: { age: 'asc' }
        },
        function(error, results) {
        });

Additionaly for elasticsearch6 the number of shards, number of replicas, the refresh behaivour on index and the mappings on index create can be addtionaly defined to optimize performace.

    var dummyRepo = repository.extend({
        collectionName: 'dummy',
        repositorySettings: {
            elasticsearch6: {
                refresh: 'wait_for', // optional, refresh behaviour on index, default is true ( ie. force index refresh ) https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-refresh.html                
                waitForActiveShards: 2 // optional, defaults to 1 ( ie. wait only for primary ) https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-create-index.html#create-index-wait-for-active-shards
                index: { // optional applied on index create, https://www.elastic.co/guide/en/elasticsearch/reference/6.x/indices-create-index.html
                    settings : { // will be merged with the default ones,
                        number_of_shards: 3, // optional defaults to 1,
                        number_of_replicas: 1 // optional defaults to 0,
                    },
                    mappings : { // optiona will be merged with the default ones,
                        properties: { // specific properties to not be handled by dynamic mapper
                            title: {
                                type: "text"
                            }
                        }                    
                    }
                }
            }
        }
    });

Firestore

Setup

Library installation

yarn add @google-cloud/firestore or npm install --save @google-cloud/firestore

Options

Use the firestore type to support Google's Firestore database, and store your KeyFile in a location accessible by your application.

    const options = {
        repository: {
            type: 'firestore',
            projectId: 'YOUR_PROJECT_ID',
            keyFilename: '/path/to/keyfile.json'
        },
    };

Find Queries

Simple (equality comparison) find queries are supported by passing javascript objects as the query parameter, or more complex queries can be executed via nested arrays. In the case of multiple key/value pairs or nested arrays, the composite predicates form logical ANDs.

    // Simple Object format
    aRepo.find({'aProp': 'aValue', 'secondProp': 'secondValue'}, function (err, vm) {
        if (err) {
            console.log('Repo find error', err);
            return;
        }
        console.log('Found', vm);
    });

    // Nested array syntax, allows for more complex predicates
    aRepo.find([['aProp', '==', 'aValue'], ['secondProp', '<', 10000]], function (err, vm) {
        if (err) {
            console.log('Repo find error', err);
            return;
        }
        console.log('Found', vm);
    });

The queryOptions parameter supports limit, skip, and sort, in a mongoDb-like syntax.

Testing Setup

To provide the authentication file to tests, the GOOGLE_APPLICATION_CREDENTIALS environment setting should point to the file so it can be loaded by firestore. To inject the file in TravisCI, create a new environment variable called BASE64_GOOGLE_KEY in the Travis GUI, and set the value of this to be the Base64 encoded content of the file. The .travis.yml file contains configuration to decode this setting and write it out to a known location for the CI settings to pickup.

Release notes

Database Support

Currently these databases are supported:

  1. inmemory
  2. mongodb ([node-mongodb-native] (https://github.com/mongodb/node-mongodb-native))
  3. couchdb ([cradle] (https://github.com/cloudhead/cradle))
  4. tingodb ([tingodb] (https://github.com/sergeyksv/tingodb))
  5. redis ([redis] (https://github.com/mranney/node_redis))
  6. azuretable (azure-storage)
  7. documentdb (documentdb, doqmentdb)
  8. elasticsearch ([elasticsearch] (https://github.com/elastic/elasticsearch-js))
  9. elasticsearch6 ([elasticsearch] (https://github.com/elastic/elasticsearch-js)) - for Elasticsearch 5.x and 6.x
  10. dynamodb ([aws-sdk] (https://github.com/aws/aws-sdk-js))
  11. firestore ([@google-cloud/firestore] (https://github.com/googleapis/nodejs-firestore))

own db implementation

You can use your own db implementation by extending this...

var Repository = require('viewmodel').Repository,
util = require('util'),
    _ = require('lodash');

function MyDB(options) {
  Repository.call(this, options);
}

util.inherits(MyDB, Repository);

_.extend(MyDB.prototype, {

  ...

});

module.exports = MyDB;

License

Copyright (c) 2018 Adriano Raiano

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.