Read-Models Bundle for Symfony

Integrates read-models into Symfony via a bundle.

Installation

Install using composer, or checkout / pull the files from github.com.

• composer require somnambulist/read-models-bundle
• add the bundle class to config/bundles.php as the last bundle
  • Note: if not configured last, then any custom doctrine types may not be assigned to the type caster as the Manager will boot too soon.
• add a config file (config/packages/somnambulist.yaml) with the configuration
• map any custom casters via the services.yaml and tags
• make some models
• load some data: <model>::find()

An example config in config/packages/somnambulist.yaml could be:

somnambulist_read_models:
    connections:
        'default': 'doctrine.dbal.default_connection'
        'App\Models\User': 'doctrine.dbal.user_connection'
    subscribers:
        request_manager_clearer: true
        messenger_manager_clearer: true

There are 2 event subscribers that are auto-registered:

• identity map clear on kernel request, terminate
• messenger clear on message handled / failed

If messenger is not installed, the listener will be disabled automatically.

Connections

Each model type can have a custom connection by using the fully qualified class name as the key. When referencing the Doctrine connections, be sure to leave off the @ prefix if copying from elsewhere.

Note that if the default is not specified, then the currently configured Doctrine default will be auto-registered.

Adding Attribute Casters

Add attribute casters as services and tag them with: somnambulist.read_models.type_caster to have them automatically registered with the Managers attribute caster instance.

To use the attribute-model generic type casters, and them as services and configure as needed:

services:
    app.type_casters.some_service_identity:
        class: Somnambulist\Components\AttributeModel\TypeCasters\ExternalIdentityCaster
        arguments:
            $providerAttribute: 'some_service_name' 
            $identityAttribute: 'some_service_id'
            $remove: true 
            $types:
                -
                    some_service_id
        tags: ['somnambulist.read_models.type_caster']

    app.type_casters.my_value_object:
        class: Somnambulist\Components\AttributeModel\TypeCasters\SimpleValueObjectCaster
        arguments:
            $class: 'App\\Entities\\SomeEntityValueObject' 
            $types:
                -
                    short_name
        tags: ['somnambulist.read_models.type_caster']

Or if you don't need configuration, or have your own; use a resource:

services:
    App\TypeCasters\:
        resource: '../../src/TypeCasters/'
        tags: ['somnambulist.read_models.type_caster']

The attribute names should be the array key names that the values are expected to appear in from the data source. For example: if a Product model accesses a products table that has unit_value and unit_cur fields, this could be converted to a Money object by using the MoneyCaster:

services:
    app.type_casters.product_money_caster:
        class: Somnambulist\Components\AttributeModel\TypeCasters\MoneyCaster
        arguments:
            $amtAttribute: 'unit_value' 
            $curAttribute: 'unit_cur'
            $remove: true 
            $types:
                -
                    product_price
        tags: ['somnambulist.read_models.type_caster']

Then the caster can be referenced in the casts as: 'price' => 'product_price' and the unit_value and unit_cur attributes will be removed in favour of the single "price" attribute that will be a Money value object. If the originals should be left in place, set $remove to false.

Additional casters can be added at any time; and existing casters may be overridden by re-using an existing type name however this is discouraged. Note that once a type is registered it cannot be removed.

Usage

See read-models for detailed docs on usage and attribute-models for more on the attribute caster.