That Simple Model

Overview

A simple set of Model definition Decorators

Example Model

The following example describes a very simple Model with both a Primary and a Secondary key

In this instance, the primary key (also known as the Partition key) can be used for partitioning the database during persistence

@Model()
class Book {
    static meta: IMetaModel
    meta: IMetaModel

    @PrimaryKey
    clientId: string

    @SecondaryKey
    bookId: string

    title: string
}

The following shows a more traditional model with just a primary key

@Model()
class Book implements IModel {
    static meta: IMetaModel
    meta: IMetaModel

    @PrimaryKey
    bookId: string = uuid.v4()

    title: string
}

Model decorator

The model decorator adds a IMetaModel object to the prototype of the class. This provides access to "introspect" the meta data for the model.

The title, description and kind can all be set/overriden as part of the Model decorator

@Model({
    title: 'A Book',
    description: 'A collection of pages with words on',
    kind: 'tblBook'
})
class Book {
    static meta: IMetaModel
    meta: IMetaModel

    @PrimaryKey
    clientId: string

    @SecondaryKey
    bookId: string

    title: string
}