Esensi Model Traits Package

Version 1

An Esensi package, coded by SiteRocket Labs®.

The Esensi/Model package is just one package that makes up Esensi, a platform built on Laravel. This package uses PHP traits to extend Laravel's default Eloquent models and traits. Using traits allows for a high-degree of code reusability and extensibility. While this package provides some reasonable base models, developers are free to mix and match traits in any combination needed, being confident that the code complies to a reliable interface and is properly unit tested. For more details on the inner workings of the traits please consult the generously documented source code.

Note

This code is specifically designed to be compatible with the Laravel Framework and may not be compatible as a stand-alone dependency or as part of another framework.

Extend the Default Model

The simplest way to demonstrate the traits is to extend the base Esensi\Model\Model. For example, if the application requires a simple blog, then the developer could create a Post model that automatically handles validation, purging, hashing, encrypting, attribute type juggling and even simplified relationship bindings by simply extending this ready-to-go model:

<?php

use Esensi\Model\Model;

class Post extends Model {

    /**
     * The database table used by the model.
     *
     * @var string
     */
    protected $table = 'posts';

}

Pro Tip: The more lean way to use Esensi\Model traits is to consume traits on the individual models instead of creating an inheritance dependency. Take a look at the generously commented Esensi\Model\Model source code for details on how to use individual traits with and without extending the default model.

Use Soft Deletes Instead

If the application requires that the articles be sent to the trash before permanently deleting them, then the developer can just swap out the Esensi\Model\Model with the soft deleting version Esensi\Model\SoftModel like so:

<?php

use Esensi\Model\SoftModel;

class Post extends SoftModel {

}

Pro Tip: While Laravel includes SoftDeletingTrait, Esensi expands upon this by also forcing the trait to comply with a SoftDeletingModelInterface contract. This ensures a higher level of compatibility and code integrity. You can then do checks like $model instanceof SoftDeletingModelInterface to conditionally handle actions.

Table of Contents

Help Write Better Documentation: The documentation is still a work in progress. You can help others learn to reuse code by contributing better documentation as a pull request.

• Installation
• Validating Model Trait
  • Self-Taught Coders Tutorial
  • Auto-Validating on Save
  • Manually Validating Model Attributes
  • Handling Validation Errors
  • Using Force Save
• Purging Model Trait
  • Auto-Purging on Save
  • Manually Purging Model Attributes
• Hashing Model Trait
  • Auto-Hashing on Save
  • Manually Hashing Model Attributes
• Encrypting Model Trait
  • Auto-Encrypting on Access
  • Manually Encrypting Model Attributes
  • Checking Encryption State
• Juggling Model Trait
  • Auto-Juggling on Access
  • Manually Juggling Model Attributes
• Soft Deleting Model Trait
  • Using Soft Deletes
  • Adding Custom Dates
  • Using Force Delete
• Relating Model Trait
  • Using Simplified Relationships
• Sluggable Model Trait
  • Using Slugs on Models
• Unit Testing
  • Running the Unit Tests
• Contributing
• Licensing

Installation

Add the esensi/model package as a dependency to the application. Using Composer, this can be done from the command line:

composer require esensi/model 0.6.*

Or manually it can be added to the composer.json file:

{
    "require": {
        "esensi/model": "0.6.*"
    }
}

If manually adding the package, then be sure to run composer update to update the dependencies.

Validating Model Trait

This package includes the ValidatingModelTrait which implements the ValidatingModelInterface on any Eloquent model that uses it. The ValidatingModelTrait adds methods to Eloquent models for:

• Automatic validation on create(), update(), save(), delete(), and restore() methods
• Integration with Laravel's Validation services to validate model attributes
• Integration with Laravel's MessageBag so that models can return errors when validation fails
• Option to throw ValidationException when validation fails
• Ability to forceSave() and bypass validation rules entirely
• Automatic injection (or not) of the model's identifier for unique validation rules

Like all the traits, it is self-contained and can be used individually. Special credit goes to the very talented Dwight Watson and his Watson/Validating Laravel package which is the basis for this trait. Emerson Media collaborated with him as he created the package. Esensi wraps his traits with consistent naming conventions for the other Esensi model traits. Please review his package in detail to see the inner workings.

Self-Taught Coders Tutorial

This Esensi package has been featured in various places from university classrooms to coding schools to online programming courses. Among one of those online programming courses is Alex Coleman's Self-Taught Coders series From Idea To Launch. Throughout the course, Alex teaches how to design and build a complete Laravel web application. Lesson 24 in the series covers automatic model validation using Esensi\Model as a basis for the workflow. According to Alex:

Model validation is the method of establishing rules to ensure when you’re creating, or updating, an object based on a model, that all of its field values are set appropriately. That all required fields are filled, that all date fields are formatted properly, etc.

• Read Laravel 8 Model Validation With the Esensi Model Traits Package
• Signup for From Ideas to Launch

Auto-Validating On Save

While developers can of course use the Model or SoftModel classes which already include the ValidatingModelTrait, the following code will demonstrate adding auto-validation to any Eloquent based model.

<?php

use Esensi\Model\Contracts\ValidatingModelInterface;
use Esensi\Model\Traits\ValidatingModelTrait;
use Illuminate\Database\Eloquent\Model as Eloquent;

class Post extends Eloquent implements ValidatingModelInterface {

    use ValidatingModelTrait;

    /**
     * These are the default rules that the model will validate against.
     * Developers will probably want to specify generic validation rules
     * that would apply in any save operation vs. form or route
     * specific validation rules. For simple models, these rules can
     * apply to all save operations.
     *
     * @var array
     */
    protected $rules = [
       'title'     => [ 'max:64' ],
       'slug'      => [ 'max:16', 'alpha_dash', 'unique' ],
       'published' => [ 'boolean' ],
       // ... more attribute rules
    ];

    /**
     * These are the rulesets that the model will validate against
     * during specific save operations. Rulesets should be keyed
     * by either the in progress event name of the save operation
     * or a custom unique key for custom validation.
     *
     * The following rulesets are automatically applied during
     * corresponding save operations:
     *
     *     "creating" after "saving" but before save() is called (on new models)
     *     "updating" after "saving" but before save() is called (on existing models)
     *     "saving" before save() is called (and only if no "creating" or "updating")
     *     "deleting" when calling delete() method
     *     "restoring" when calling restore() method (on a soft-deleting model)
     *
     * @var array
     */
    protected $rulesets = [

        'creating' => [
            'title'     => [ 'required', 'max:64' ],
            'slug'      => [ 'required', 'alpha_dash', 'max:16', 'unique' ],
            'published' => [ 'boolean' ],
            // ... more attribute rules to validate against when creating
        ],

        'updating' => [
            'title'     => [ 'required', 'max:64' ],
            'slug'      => [ 'required', 'alpha_dash', 'max:16', 'unique' ],
            'published' => [ 'boolean' ],
            // ... more attribute rules to validate against when updating
        ],
    ];

}

Then from the controller or repository the developer can interact with the Post model's attributes, call the save() method and let the Post model handle validation automatically. For demonstrative purposes the following code shows this pattern from a simple route closure:

Route::post( 'posts', function()
{
    // Hydrate the model from the Input
    $attributes = Input::only( 'title', 'slug', 'published' );
    $post = new Post( $attributes );

    // Attempt to save, will return false on invalid model.
    // Because this is a new model, the "creating" ruleset will
    // be used to validate against. If it does not exist then the
    // "saving" ruleset will be attempted. If that does not exist, then
    // finally it will default to the Post::$rules.
    if ( ! $post->save() )
    {
        // Redirect back to the form with the message bag of errors
        return Redirect::to( 'posts' )
            ->withErrors( $post->getErrors() )
            ->withInput();
    }

    // Redirect to the new post
    return Redirect::to( 'posts/' . $post->id );
});

Calling the save() method on the newly created Post model would instead use the "updating" ruleset from Post::$ruleset while saving. If that ruleset did not exist then it would default to using the Post::$rules.

Pro Tip: While using this pattern is perfectly fine, try not to actually validate your form requests using such rulesets. Instead use Laravel 8's FormRequest injection to validate your forms. The ValidatingModelTrait is for validating your model's data integrity, not your entry form validation.

Purging Model Trait

This package includes the PurgingModelTrait which implements the PurgingModelInterface on any Eloquent model that uses it. The PurgingModelTrait adds methods to Eloquent models for automatically purging attributes from the model just before write operations to the database. The trait automatically purges:

• attributes in the $purgeable property
• attributes prefixed with an underscore (i.e.: _private)
• attributes ending in _confirmation (i.e.: password_confirmation)

Like all the traits, it is self-contained and can be used individually.

Pro Tip: This trait uses the PurgingModelObserver to listen for the eloquent.creating and eloquent.updating events before automatically purging the purgeable attributes. The order in which the traits are used in the Model determines the event priority: if using the ValidatingModelTrait be sure to use it first so that the purging event listner is fired after the validating event listener has fired.

Auto-Purging on Save

While developers can of course use the Model or SoftModel classes which already include the PurgingModelTrait, the following code will demonstrate using automatic purging on any Eloquent based model.

<?php

use Esensi\Model\Contracts\PurgingModelInterface;
use Esensi\Model\Traits\PurgingModelTrait;
use Illuminate\Database\Eloquent\Model as Eloquent;

class Post extends Eloquent implements PurgingModelInterface {

    use PurgingModelTrait;

    /**
     * These are the attributes to purge before saving.
     *
     * Remember, anything prefixed with "_" or ending
     * in "_confirmation" will automatically be purged
     * and does not need to be listed here.
     *
     * @var array
     */
    protected $purgeable = [
        'analytics_id',
        '_private_attribute',
        'password_confirmation',
    ];

}

Pro Tip: From an efficiency stand point, it is theoretically better to assign all purgeable attributes in the $purgeable property including underscore prefixed and _confirmation suffixed attributes since the $purgeable property is checked first and does not require string parsing and comparisons.

The developer can now pass form input to the Post model from a controller or repository and the trait will automatically purge the non-attributes before saving. This gets around those pesky "Unknown column" MySQL errors when the set value is mutated to an internal attribute or when you conditionally want to ignore any fill values. For demonstrative purposes the following code shows this in practice from a simple route closure:

Route::post( 'posts', function( $id )
{
    // Hydrate the model from the Input
    $input = Input::all();
    $post = new Post($input);

    // At this point $post->analytics_id might exist.
    // If we tried to save it, MySQL would throw an error.

    // Save the Post
    $post->save();

    // At this point $post->analytics_id is for sure purged.
    // It was excluded becaused it existed in Post::$purgeable.
});

Manually Purging Model Attributes

It is also possible to manually purge attributes. The PurgingModelTrait includes several helper functions to make manual manipulation of the $purgeable property easier.

// Hydrate the model from the Input
$post = Post::find($id);
$post->fill( Input::all() );

// Manually purge attributes prior to save()
$post->purgeAttributes();

// Manually get the attributes
$post->getHashable(); // ['foo']

// Manually set the purgeable attributes
$post->setPurgeable( ['foo', 'bar'] ); // ['foo', 'bar']

// Manually add an attribute to the purgeable attributes
$post->addPurgeable( 'baz' ); // ['foo', 'bar', 'baz']
$post->mergePurgeable( ['zip'] ); // ['foo', 'bar', 'baz', 'zip']
$post->removePurgeable( 'foo' ); // ['bar', 'baz', 'zip']

// Check if an attribute is in the Post::$purgeable property
if ( $post->isPurgeable( 'foo' ) )
{
    // ... foo is not purgeable so this would not get executed
}

// Do not run purging for this save only.
// This is useful when purging is enabled
// but needs to be temporarily bypassed.
$post->saveWithoutPurging();

// Disable purging
$post->setPurging(false); // a value of true would enable it

// Run purging for this save only.
// This is useful when purging is disabled
// but needs to be temporarily ran while saving.
$post->saveWithPurging();

Hashing Model Trait

This package includes the HashingModelTrait which implements the HashingModelInterface on any Eloquent model that uses it. The HashingModelTrait adds methods to Eloquent models for automatically hashing attributes on the model just before write operations to the database. The trait includes the ability to:

• automatically hash attributes in the $hashable property
• manually hash a value using the hash() method
• compare a plain text value with a hash using the checkHash() method
• check if a value is hashed using the isHashed() method
• swap out the HasherInterface used using the setHasher() method

Like all the traits, it is self-contained and can be used individually.

Pro Tip: This trait uses the HashingModelObserver to listen for the eloquent.creating and eloquent.updating events before automatically hashing the hashable attributes. The order in which the traits are used in the Model determines the event priority: if using the ValidatingModelTrait be sure to use it first so that the hashing event listner is fired after the validating event listener has fired.

Auto-Hashing on Save

While developers can of course use the Model or SoftModel classes which already include the HashingModelTrait, the following code will demonstrate using automatic hashing on any Eloquent based model. For this example, the implementation of automatic hashing will be applied to a User model which requires the password to be hashed on save:

<?php

use Esensi\Model\Contracts\HashingModelInterface;
use Esensi\Model\Traits\HashingModelTrait;
use Illuminate\Database\Eloquent\Model as Eloquent;

class User extends Eloquent implements HashingModelInterface {

    use HashingModelTrait;

    /**
     * These are the attributes to hash before saving.
     *
     * @var array
     */
    protected $hashable = [ 'password' ];

}

Pro Tip: The HashingModelTrait is a great combination for the PurgingModelTrait. Often hashable attributes need to be confirmed and using the PurgingModelTrait, the model can be automatically purged of the annoying _confirmation attributes before writing to the database. While the use order of these two traits is not important relative to each other, it is important to use them after ValidatingModelTrait if that trait is used as well. Otherwise, the model will purge or hash the attributes before validating.

The developer can now pass form input to the User model from a controller or repository and the trait will automatically hash the password before saving. For demonstrative purposes the following code shows this in practice from a simple route closure:

Route::post( 'account', function()
{
    // Hydrate the model from the Input
    $user = Auth::user();
    $user->password = Input::get('password');

    // At this point $user->password is still plain text.
    // This allows for the value to be checked by validation.

    // Save the User
    $user->save();

    // At this point $user->password is for sure hashed.
    // It was hashed becaused it existed in User::$hashable.
});

Manually Hashing Model Attributes

It is also possible to manually hash attributes. The HashingModelTrait includes several helper functions to make manual manipulation of the $hashable property easier.

// Hydrate the model from the Input
$post = User::find($id);
$post->password = Input::get('password');

// Manually hash attributes prior to save()
$post->hashAttributes();

// Manually get the attributes
$post->getHashable(); // ['foo']

// Manually set the hashable attributes
$post->setHashable( ['foo', 'bar'] ); // ['foo', 'bar']

// Manually add an attribute to the hashable attributes
$post->addHashable( 'baz' ); // ['foo', 'bar', 'baz']
$post->mergeHashable( ['zip'] ); // ['foo', 'bar', 'baz', 'zip']
$post->removeHashable( 'foo' ); // ['bar', 'baz', 'zip']

// Check if an attribute is in the User::$hashable property
if ( $post->isHashable( 'foo' ) )
{
    // ... foo is not hashable so this would not get executed
}

// Check if an attribute is already hashed
if ( $post->isHashed( 'foo' ) )
{
    // ... if foo were hashed this would get executed
}

// Check if the password when hashed matches the stored password.
// This is just a unified shorthand to Crypt::checkHash().
if ( $post->checkHash( 'password123', $post->password ) )
{
    // ... if the password matches you could authenticate the user
}

// Swap out the HasherInterface used
$post->setHasher( new MyHasher() );

// Do not run hashing for this save only.
// This is useful when hashing is enabled
// but needs to be temporarily bypassed.
$post->saveWithoutHashing();

// Disable hashing
$post->setHashing(false); // a value of true would enable it

// Run hashing for this save only.
// This is useful when hashing is disabled
// but needs to be temporarily ran while saving.
$post->saveWithHashing();

Encrypting Model Trait

This package includes the EncryptingModelTrait which implements the EncryptingModelInterface on any Eloquent model that uses it. The EncryptingModelTrait adds methods to Eloquent models for automatically encrypting attributes on the model whenever they are set and for automatically decrypting attributes on the model whenever they are got. The trait includes the ability to:

• automatically encrypt attributes in the $encryptable property when setting them
• automatically decrypt attributes in the $encryptable property when getting them
• manually encrypt/decrypt a value using the encrypt() and decrypt() methods
• check if a value is encrypted using the isEncrypted() method
• swap out the encrypter class used using the setEncrypter() method

Like all the traits, it is self-contained and can be used individually. Be aware, however, that using this trait does overload the magic __get() and __set() methods of the model (see Esensi\Model\Model source code for how to deal with overloading conflicts).

Manually Encrypting Model Attributes

It is also possible to manually encrypt attributes. The EncryptingModelTrait includes several helper functions to make manual manipulation of the $encryptable property easier.

// Hydrate the model from the Input
$post = Model::find($id);
$post->secret = Input::get('secret'); // automatically encrypted

// Manually encrypt attributes prior to save()
$post->encryptAttributes();

// Manually encrypt and decrypte a value
$encrypted = $post->encrypt( 'plain text' );
$decrypted = $post->decrypt( $encrypted ); // plain text

// Manually get the attributes
$post->getEncryptable(); // ['foo']

// Manually set the encryptable attributes
$post->setEncryptable( ['foo', 'bar'] ); // ['foo', 'bar']

// Manually add an attribute to the encryptable attributes
$post->addEncryptable( 'baz' ); // ['foo', 'bar', 'baz']
$post->mergeEncryptable( ['zip'] ); // ['foo', 'bar', 'baz', 'zip']
$post->removeEncryptable( 'foo' ); // ['bar', 'baz', 'zip']

// Check if an attribute is in the Model::$encryptable property
if ( $post->isEncryptable( 'foo' ) )
{
    // ... foo is not encryptable so this would not get executed
}

// Check if an attribute is already encrypted.
// You could also check $post->isDecrypted( 'foo' ).
if ( $post->isEncrypted( 'foo' ) )
{
    // ... if foo were encrypted this would get executed
}

// Swap out the encrypter class used
$post->setEncrypter( new MyEncrypter() );

// Disable encrypting
$post->setEncrypting(false); // a value of true would enable it

Juggling Model Trait

This package includes the JugglingModelTrait which implements the JugglingModelInterface on any Eloquent model that uses it. The JugglingModelTrait adds methods to Eloquent models for automatically type casting (juggling) attributes on the model whenever they are got or set. The trait includes the ability to:

• automatically cast attributes to a type when getting them
• automatically cast attributes to a type when setting them
• manually casting a value using the juggle() method
• manually casting to pre-defined types including:
  • null => juggleNull() (returns null on empty)
  • string => juggleString()
  • boolean (bool) => juggleBoolean()
  • integer (integer) => juggleInteger()
  • float (double) => juggleFloat()
  • array => juggleArray()
  • date => juggleDate() (returns Carbon date)
  • datetime (date_time) => juggleDateTime() (returns as 0000-00-00 00:00:00)
  • timestamp => juggleTimestamp() (returns Unix timestamp)
• create custom types to cast to with magic model methods like:
  • Example: fooBar => juggleFooBar()

Like all the traits, it is self-contained and can be used individually. Be aware, however, that using this trait does overload the magic __get() and __set() methods of the model (see Esensi\Model\Model source code for how to deal with overloading conflicts). Special credit goes to the brilliant Dayle Rees, author of Code Bright book, who inspired this trait with his pull request to Laravel which eventually arrived in Laravel 8 as Attribute Casting which supports basic type casting.

Auto-Juggling on Access

Pro Tip: PHP extensions like php-mysqlnd should be used when available to handle casting from and to persistent storage, this trait serves a dual purpose of type casting and simplified attribute mutation (juggling) especially when a native extension is not available.

While developers can of course use the Model or SoftModel classes which already include the JugglingModelTrait, the following code will demonstrate using automatic type juggling on any Eloquent based model. For this example, the implementation of automatic type juggling will be applied to a Post model which requires certain attributes to be type casted when attributes are accessed:

<?php

use Esensi\Model\Contracts\JugglingModelInterface;
use Esensi\Model\Traits\JugglingModelTrait;
use Illuminate\Database\Eloquent\Model as Eloquent;

class Post extends Eloquent implements JugglingModelInterface {

    use JugglingModelTrait;

    /**
     * Attributes to cast to a different type.
     *
     * @var array
     */
    protected $jugglable = [

        // Juggle the published_at attribute to a date
        'published_at' => 'date',

        // Cast the terms attribute to a boolean
        'terms' => 'boolean',

        // Juggle the foo attribute to a custom bar type
        'foo' => 'bar',
    ];

    /**
     * Example of a custom juggle "bar" type.
     *
     * @param  mixed $value
     * @return \Bar
     */
    protected function juggleBar( $value )
    {
        return new Bar($value);
    }

}

The developer can now pass form input to the Post model from a controller or repository and the trait will automatically type cast/juggle the attributes when setting. The same holds true for when the attributes are loaded from persistent storage as the model is constructed: the attributes are juggled to their types. Even for persistent storage that does not comply, the jugglable attributes are automatically type casted when retrieved from the model. For demonstrative purposes the following code shows this in practice from a simple route closure:

Route::post( 'post/{id}/publish', function( $id )
{
    // Hydrate the model from the Input
    $post = Post::find($id);

    // The published_at attribute will be converted to a Carbon date
    // object. You could then use $post->published_at->format('Y-m-d').
    $post->published_at = Input::get('published_at');

    // Convert those pesky checkboxes to proper booleans.
    $post->terms = Input::get('terms', false);

    // The foo attribute will be casted as the custom "bar" type using
    // juggleBar() so it's value would now be a Bar object.
    $post->foo = Input::get('foo');

    // Save the Post or do something else
    $post->save();
});

Pro Tip: Some great uses for JugglingModelTrait would be custom "types" that map to commonly mutators jugglers for phone, url, json, types etc. Normally developers would have to map the attributes to attribute mutators and accessors which are hard-coded to the attribute name. Using the $jugglable property these attributes can be mapped to custom juggle methods easily in a reusable way. Custom services could be used as part of the juggle method too. This would make converting currency from one type to a normalized type or to convert from floating values (1.99) to integers (199) when persisted.

Manually Juggling Model Attributes

It is also possible to manually juggle attributes. The JugglingModelTrait includes several helper functions to make manual manipulation of the $jugglable property easier.

// Hydrate the model from the Input
$post = Model::find($id);
$post->foo = Input::get('foo'); // automatically juggled

// Manually juggle attributes after setting
$post->juggleAttributes();

// Manually juggle a value to a type
$boolean   = $post->juggle( 'true', 'boolean' ); // bool(true)
$boolean   = $post->juggleBoolean( '0' ); // bool(false)
$array     = $post->juggleArray( 'foo' ); // array(0 => foo)
$date      = $post->juggleDate( '2014-07-10' ); // object(\Carbon\Carbon)
$dateTime  = $post->juggleDateTime( Carbon::now() ); // string(2014-07-10 11:17:00)
$timestamp = $post->juggleTimestamp( '07/10/2014 11:17pm' ); // integer(1405034225)

// Manually get the attributes
$post->getJugglable(); // ['foo' => 'string']

// Manually set the jugglable attributes
$post->setJugglable( ['bar' => 'boolean'] ); // ['bar' => 'boolean']

// Manually add an attribute to the jugglable attributes
$post->addJugglable( 'baz', 'integer' ); // ['bar' => 'boolean', 'baz' => 'integer']
$post->mergeJugglable( ['zip' => 'array'] ); // ['bar' => 'boolean', 'baz' => 'integer', 'zip' => 'array']
$post->removeJugglable( 'bar' ); // ['baz' => 'integer', 'zip' => 'array']

// Check if an attribute is in the Model::$jugglable property
if ( $post->isJugglable( 'foo' ) )
{
    // ... foo is not jugglable so this would not get executed
}

// Check if a type is castable
// For this example juggleBar() is not a method.
if ( $post->isJuggleType( 'bar' ) )
{
    // ... this code wouldn't get executed because bar is not a cast type
}

// Throws an exception on invalid cast type
// It's used internally by setJugglable() to enforce valid cast types
$post->checkJuggleType( 'bar' );

// Disable juggling
$post->setJuggling(false); // a value of true would enable it

Soft Deleting Model Trait

This package includes the SoftDeletingModelTrait which implements the SoftDeletingModelInterface on any Eloquent model that uses it. The SoftDeletingModelTrait wraps the default Eloquent model's SoftDeletingTrait for a unified naming convention and stronger interface hinting. The trait also includes the ability to set additional dates in the $dates property without having to remember to add deleted_at.

Like all the traits, it is self-contained and can be used individually. As a convenience, the Esensi\Model\SoftModel extends the Esensi\Model\Model and implements the trait already. The developer can just extend the SoftModel and not have to refer to the Laravel soft deleting documentation again.

Pro Tip: Just because a model uses the SoftDeletingModelTrait does not mean that the database has the deleted_at column in its table. Be sure to add $table->softDeletes(); to a table migration.

Relating Model Trait

This package includes the RelatingModelTrait which implements the RelatingModelInterface on any Eloquent model that uses it. The RelatingModelTrait adds methods to Eloquent models for automatically resolving related models:

• from simplified configs using the $relationships property
• add pivot attributes from simplified configs using the $relationshipPivots property
• as magic method calls such as Post::find($id)->comments()->all()
• as magic attribute calls such as Post::find($id)->author

Pro Tip: As an added bonus, this trait includes a special Eloquent without() scope which accepts relationships to remove from the eager loaded list, exactly opposite of the built in Eloquent support for with(). This is particularly useful for models that set the $with property but occassionally need to remove the eager loading to improve performance on larger queries. This does not impact lazy/manual loading using the dynamic or load() methods.

Like all the traits, it is self-contained and can be used individually. Be aware, however, that using this trait does overload the magic __call() and __get() methods of the model (see Esensi\Model\Model source code for how to deal with overloading conflicts). Special credit goes to Phillip Brown and his Philipbrown/Magniloquent Laravel package which inspired this trait.

Using Simplified Relationships

While developers can of course use the Model or SoftModel classes which already include the RelatingModelTrait, the following code will demonstrate adding simplified relationship bindings to any Eloquent based model.

<?php

use Esensi\Model\Contracts\RelatingModelInterface;
use Esensi\Model\Traits\RelatingModelTrait;
use Illuminate\Database\Eloquent\Model as Eloquent;

class Post extends Eloquent implements RelatingModelInterface {

    use RelatingModelTrait;

    /**
     * These are the relationships that the model should set up.
     * Using PHP and Laravel's magic, these relationship keys
     * resolve to the actual models automatically.
     *
     * @example relationship bindings:
     *
     *     [ 'hasOne', 'related', 'foreignKey', 'localKey' ]
     *     [ 'hasMany', 'related', 'foreignKey', 'localKey' ]
     *     [ 'hasManyThrough', 'related', 'through', 'firstKey', 'secondKey' ]
     *     [ 'belongsTo', 'related', 'foreignKey', 'otherKey', 'relation' ]
     *     [ 'belongsToMany', 'related', 'table', 'foreignKey', 'otherKey', 'relation' ]
     *     [ 'morphOne', 'related', 'name', 'type', 'id', 'localKey' ]
     *     [ 'morphMany', 'related', 'name', 'type', 'id', 'localKey' ]
     *     [ 'morphTo', 'name', 'type', 'id' ]
     *     [ 'morphToMany', 'related', 'name', 'table', 'foreignKey', 'otherKey', 'inverse' ]
     *     [ 'morphedByMany', 'related', 'name', 'table', 'foreignKey', 'otherKey' ]
     *
     * @var array
     */
    protected $relationships = [

        // Bind Comment model as a hasMany relationship.
        // Use $post->comments to query the relationship.
        'comments' => [ 'hasMany', 'Comment' ],

        // Bind User model as a belongsTo relationship.
        // Use $post->author to get the User model.
        'author' => [ 'belongsTo', 'User' ],

        // Bind User model as a belongsTo relationship.
        // Use $post->author to get the User model.
        'tags' => [ 'belongsToMany', 'Tag']
    ];

    /**
     * These are the additional pivot attributes that the model
     * will setup on the relationships that support pivot tables.
     *
     * @var array
     */
    protected $relationshipPivots = [

        // Bind pivot attributes to Tag model when querying the relationship.
        // This is equivalent to $post->tags()->withTimestamps()->withPivot('foo').
        'tags' => [ 'timestamps', 'foo' ]
    ];
}

The developer can now use the Post model's relationships from a controller or repository and the trait will automatically resolve the relationship bindings. For demonstrative purposes the following code shows this pattern from a simple route closure:

Route::get( 'posts/{id}/comments', function( $id )
{
    // Retrieve the post by ID
    $post = Post::find( $id );

    // Query the post for all the related comments.
    // The trait will resolve the "comments" from
    // the Post::$relationships bindings.
    $comments = $post->comments()->all();

    // It is also possible to shorten this using the
    // magic attributes instead. It is equivalent to
    // the above call.
    $comments = $post->comments;

    // Access the pivot table columns off a
    // many-to-many relationship model.
    $tag = $post->tags()->first();
    $carbon = $tag->pivot->created_at; // Carbon Date
    $bar = $tag->pivot->foo;
});

Unit Testing

The Esensi platform includes other great packages just like this Esensi/Model package. This package is currently tagged as 1.x because the other platform packages are not ready for public release. While the others may still be under development, this package already includes features that would be mature enough for a 1.x release including unit testing and extensive testing in real-world applications.

Running the Unit Tests

This package uses PHPUnit to automate the code testing process. It is included as one of the development dependencies in the composer.json file:

{
    "require-dev": {
        "phpunit/phpunit": "4.1.*",
        "mockery/mockery": "0.9.*"
    }
}

The test suite can be ran from the command line using the phpunit test runner:

phpunit ./tests

Important: There is currently a bug in Laravel (see issue #1181) that prevents model events from firing more than once in a test suite. This means that the first test that uses model tests will pass but any subseqeuent tests will fail. There are a couple of temporary solutions listed in that thread which you can use to make your tests pass in the meantime: namely Model::flushEventListeners() and Model::boot() after each test runs.

Pro Tip: Please help the open-source community by including good code test coverage with your pull requests. The Esensi development team will review pull requests with unit tests and passing tests as a priority. Significant code changes that do not include unit tests will not be merged.

Contributing

Thank you for considering contributing to Esensi Core!

Licensing

Copyright (c) 2022 SiteRocket Labs

Esensi Core is open-sourced software licensed under the MIT license.