@canastro/metamorphosis

Metamorphosis

Metamorphose is a library that allows you to transform your js objects on the fly by pre-defined schemas.

Features

• Extend schemas
• Default values
• Nested schemas
• Transformations
• Dot notation
• Type validation (work in progress)

Example

Here is a simple example that tries to include most of the features of metamorphosis:

Schema Definition

const Base = new SchemaObject({
    brand: {
        type: String,
        key: 'brand',
        transform: (brand) => brand.toUpperCase()
    },
    isPrivate: 'isPrivate'
});

const Spec = new SchemaObject({
    size: {
        key: 'size',
        transform: (size) => `${size}"`
    },
    connectors: {
        key: ':root',
        transform: (tv) => (tv.videoConnectors + tv.audioConnectors).split(', ')
    }
});

const Tv = Base.extends({
    specs: { key: ':root', type: Spec },
    price: { key: 'price', defaults: 'N/A' },
    internetConnection: {
        key: 'others.hasInternetConnection',
        transform: (value) => value ? 'check' : 'not check'
    }
});

Original Object

const original = {
    brand: 'Grundig',
    thisShouldBeIgnored: 'HEY',
    isPrivate: true,
    size: 42,
    quality: 'Full HD',
    others: { hasInternetConnection: true },
    videoConnectors: '1 x Coaxial Digital Audio, 1 x Component Video, 1 x Composite Video, 2 x HDMI',
    audioConnectors: '1 x Headphone, 1 x PC Audio In, 1 x RCA Audio L+R'
};

Apply schema

const result = Tv.create(original);

Output

{
    brand: 'GRUNDIG',
    isPrivate: true,
    price: 'N/A',
    specs: {
        size: '42"',
        connectors: [
            '1 x Coaxial Digital Audio',
            '1 x Component Video',
            '1 x Composite Video',
            '2 x HDMI1 x Headphone',
            '1 x PC Audio In',
            '1 x RCA Audio L+R'
        ]
    },
    internetConnection: 'check'
}