plasm/plasm

Schemas and Changesets for PHP

Plasm

, _(*1)

Filter, cast, and validate incoming data from forms, APIs, CLI, etc., _(*2)

Schema and Changeset for PHP are inspired by Ecto.Changeset from Elixir's Ecto library., _(*3)

In Development!

Planned for V1.0:

• [ ] Default messages str replacements
• [ ] Finish default validators
• [ ] One or two provided Framework/ORM integrations
• [ ] Figure how to implement DB constraints from Integrations (unique, etc.)

Install

Use composer., _(*4)

composer require plasm/plasm:dev-master@dev

Usage

1) Define a Schema:

In the schema we specify all the fields we care about and specify what type we want them to be cast to., _(*5)

Options:, _(*6)

• type: required. the type the field should be cast to
• default: Will default to this value if not present in changeset $attrs
• virtual: This will be a future to mark fields as not for storing

<?php

use Plasm\Schema;

class UserSchema extends Schema
{
    public function definition()
    {
        return [
            'name' => ['type' => 'string'],
            'email' => ['type' => 'string'],
            'is_admin' => ['type' => 'boolean', 'default' => false],
            'age' => ['type' => 'integer'],
            'money' => ['type' => 'float'],
            'password' => ['type' => 'string', 'virtual' => true],
            'password_confirmation' => ['type' => 'string', 'virtual' => true],
            'password_hash' => ['type' => 'string'],
            'nothing' => ['type' => 'string', 'default' => null]
        ];
    }
}

2) Define a Changeset:

You can define multiple changesets in the same class. You can create completely different ones or build on top of others., _(*7)

For example, below we'll have a createChangeset for creating a user that just builds off our generic changeset and making some of the fields required., _(*8)

<?php

use Plasm\Changeset;

class UserChangeset extends Changeset
{
    /**
     * Changeset for a User.
     */
    public function changeset($attrs)
    {
        return $this
            ->cast(['name', 'email', 'is_admin', 'age', 'money', 'password', 'nothing'])
            ->validateFormat('email', '/.+@.+\..+/')
            ->validateLength('password', ['min' => 8])
            ->validateConfirmation('password')
            ->validateNumber('age', ['greater_than' => 12], 'You need to be at least 13');
    }

    /**
     * Changeset for creating a User.
     */
    public function createChangeset($attrs)
    {
        return $this
            ->changeset($attrs)
            ->validateRequired(['name', 'email', 'age', 'password'])
            ->validateChange(
                'password',
                $this->validatePassStrength(),
                'Your password is too weak'
            );
    }

    /**
     * A custom validator for checking password strength.
     */
    private function validatePassStrength()
    {
        return function($password) {
            $zxcvbn = new \ZxcvbnPhp\Zxcvbn();
            $strength = $zxcvbn->passwordStrength($password);

            return $strength['score'] >= 3;
        };
    }
}

3) Use them somewhere:

Just for example's sake, the example below looks a lot like a typical Laravel controller's store method., _(*9)

We'll pass all the request data into the createChangeset changeset and not worry since our cast method will filter out the fields we specify, cast them to their specified types, and validate them., _(*10)

If we used the EloquentChangesets trait we could call the createModel method after checking if the changeset is valid. If it wasn't valid we can return to the view with the changeset and display the changeset errors to the user., _(*11)

function store($request)
{
    $changeset = UserChangeset::using(UserSchema::class)
        ->createChangeset($request->all());

    if (! $changeset->valid()) {
        return back()->with('changeset', $changeset);
    }

    $user = $changeset->createModel();

    return redirect()->route('users/index')
        ->with('success', "User {$user->email} added");
}

License

MIT, _(*12)

Credits

• Ecto.Changeset: Most of the ideas come from here.