Stormer

The flexible Node.js ORM.

Purpose

Simplifies tasks such as creating and validating schemas for models as well as storing and getting entries from the database.

Contents

• Installation
• Quick Start
• Create instance
• Get instance
• Filter instances
• Update instance
• Schemas
• Errors
• Contributing

Installation

npm install stormer

Quick Start

1. Create a new store

var store = new Store();

2. Define a new model and its schema

var store = new Store();
 
var userSchema = {
    id: {
        type: 'String',
        primaryKey: true
    },
    firstName: 'String',
    age: {
        type: 'Number',
        required: true
    }
};
 
store.define('users', userSchema);

Supported types:

• String
• Number
• Object
• Array
• Boolean
• Date (v0.9.0 and later)

2.1. Set an alias for a model name

const assert = require('assert');
const store = new Store();
let model = {
  id: {
    type: 'String',
    primaryKey: true
  }
};
 
store.define('production.users', model);
store.alias('users', 'production.users');
 
assert(store.getModel('users') === store.getModel('production.users'));

3. Implement the required store methods

store._get = function(model, pk) {
    // Use pk to fetch single entry from your db of choice
    // Returns a Promise
    // Resolve the promise with the entry as the value if found
    // Resolve the promise with empty value if not found or reject with a NotFoundError 
};
 
store._filter = function(model, query) {
    // Use query to fetch multiple entries matching the query from your db of choice
    // Returns a Promise
    // Resolve the promise with an array of entries or an empty array if none is mathcing
};
 
store._set = function(model, obj) {
    // Use obj to create or update the entry in the db of choice
    // Returns a Promise
    // Resolve the promise with the set obj
};

Create instance

store.create('users', {
    id: '1234', 
    firstName: 'George', 
    age: 12
}).then(function(newInstance) {
    // Do something with the instance
}).catch(ValidationError, function(err) {
    // Handle a validation error 
}).catch(function(err) {
    // Handle error 
}); 

Get instance

store.get('users', '1234').then(function(instance) {
    // Do something with the instance
}).catch(NotFoundError, function(err) {
    //Handle NotFoundError
}).catch(function(err) {
    // Handle generic error
}); 

Filter instances

store.filter('users', {
    name: 'George'
}).then(function(instances) {
    // Do something with the instances
}).catch(function(err) {
    // Handle generic error
}); 

Update instance

store.get('users', {
    id: '1234',
    firstName: "George",
    age: 15
}).then(function(updatedInstance) {
    // Do something with the instance
}).catch(function(err) {
    // Handle error
});

Schemas

Define a primary key

Any field can be designated as the primary key. Only one field can be designated as the primary key.

// Defines the 'id' field as the primary key
var schema = {
    id: {
        type: 'String',
        primaryKey: true
    }
};

Nested schemas a.k.a object types

// Defines an 'address'' property with nested schema
var schema = {
    name: 'String',
    address: {
        type: 'Object',
        streetName: 'String',
        streetNumber: 'Number',
        poBox: 'Number'
    }
};

Define schemas with Array types

// Defines a 'friends' property with Array type
var schema = {
    firstName: 'String',
    friends: {
        type: 'Array',
        of: 'String'
    }
};

Custom property validations

You can define a validate(value) function on each property. The value argument passed can be used to check the validity of the value and return either a truthy or falsy value. If a falsy value is returned then a CustomValidationError is thrown.

// Defines a 'age' property with custom validation
var schema = {
    age: {
        type: 'Number',
        validate: function(value) {
            return value > 0;
        }
    }
};

Errors

You can import the errors using require('stormer').errors.<errorName>

• TypeValidationError: This error indicates that an operation failed because a schema property didn't conform with the designated type

• CustomValidationError: This error indicates that an operation failed because a schema property failed a custom validation

• NotFoundError: This error indicates that the object was not found in the store

• AlreadyExistsError: This error indicates that the object already exists in the store

Contributing

This project is work in progress and we'd love more people contributing to it.

1. Fork the repo
2. Apply your changes
3. Write tests
4. Submit your pull request