SeedCascade

A range based cascading seeder for Laravel.

This package allows you to define your database seeds by specifying ranges of numbers like 1-10 in a cascading manner.

Documentation

View the Documentation;

Introduction

Heres what your new Seeder classes would look like.

use Hedronium\SeedCascade\SeedCascade;

class DatabaseSeeder extends SeedCascade {
  public $table = "food";

  public function seedSheet() {
    return [
      '1-6' => [
        'name' => 'Cabbage',
        'type' => 'vegetable'
      ],
      '4-6' => [
        'name' => 'Carrot'
      ]
    ];
  }
}

Inserted Data in food table:

| name | type | |---------|-----------| | Cabbage | vegetable | | Cabbage | vegetable | | Cabbage | vegetable | | Carrot | vegetable | | Carrot | vegetable | | Carrot | vegetable |

It inserts 6 rows into the food table, with the name column being set to "Cabbage" on the first three and "Carrot" on the last three.

Features List

• Range Based Seeding
• Overlapping Ranges
• Interting data directly into database
• Using Models to Insert Data
• Field Inheritance
• String Interpolation
• Closures as value source
• Methods as value source

Getting Started

Installation

Install it via composer. Run the following command in your Laravel project directory.

$ composer require hedronium/seed-cascade

View it on Packagist for version information.

Creating a Seeder

1. Create a class that extends
   Hedronium\SeedCascade\SeedCascade

2. Add the $table or $model public property.

3. Implement a seedSheet() method that returns your Seeding definitions.

Example

use Hedronium\SeedCascade\SeedCascade;

class DatabaseSeeder extends SeedCascade {
  public $table = "fruits";

  public function seedSheet() {
    return [
      '1-10' => [
        'name' => 'Potao'
      ]
    ];
  }
}

Seeding definitions are contained in an associative array. The keys act as the ranges of the seeding data (eg. "1-10" means the first 10 rows inserted), pointing to another associative array consisting of key value pairs.

Using a Model

use Hedronium\SeedCascade\SeedCascade;
use App\Potato;

class DatabaseSeeder extends SeedCascade {
  public $model = Potato::class;

  public function seedSheet() {
    // Return seeding definitions.
  }
}

Multiple Ranges

Multiple ranges can also be specified.

return [
    '1-10' => ['name' => 'Potato'],
    '11-20' => ['name' => 'Tomato']
]

Overlapping Ranges

Overlapping ranges are not only possible but encouraged!

return [
    '1-10' => ['name' => 'Potato', color => 'yellow'],
    '6-10' => ['name' => 'Mango']
]

In the case of overlapping ranges, properties are automatically inherited. Meaning all rows from 1 to 10 will have the property color set to yellow.

Running Seeders

Its the same as with normal Laravel Seeders.

$ php artisan db:seed

See, no surprise here.

Seed Definitions

SeedCascade is so much cooler than what you saw above. Lets get started with leveraging it to its true potential.

Ranges

From x to y

Exactly like above. Two numbers separated by a hyphen.

return [
    '1-5' => ['name' => 'Potatoes']
]

From x and onwards

This kind of ranges allow you to write definition that apply from a certain point onwards till the end of time.

return [
    '3-n' => ['name' => 'Potatoes']
]

A number and the character n separated by a hyphen.

Actually the stuff after the hyphen doesn't really matter. Meaning, '3-Infinity', '3-n', '3-potato' or even '3-' do exactly the same thing.`

Wanring: If we use the 'to infinity' ranges such as above, we absolutely MUST set the $count property on the Seeder class, else SeedCascade would be very mad!

class DatabaseSeeder extends SeedCascade
{
    public $count = 20;
    public $table = "edible_things";

    public function seedSheet()
    {
        return [
            '1-10' => ['name' => 'Potao'],
            '3-n' => ['name' => 'Tomato']
        ];
    }
}

This makes sure the seeder knows when to stop.

Only x

Sometimes we might want to change the value of a single row. For that we may just make a key without defining a range.

return [
    '1-10' => ['name' => 'Mango'],
    '3' => ['name' => 'Dragon Fruit']
]

Only the 3rd row inserted will have its name field set with 'Dragon Fruit'.

Values

Direct Value

This ones simple, we just type in the value.

return [
    '1-n' => ['name' => 'Potato', 'price' => 20],
    '5-n' => ['name' => 'Potato', 'price' => 100]
]

Array

This ones pretty simple too. We type is multiple values as an array.

return [
  '1-4' => [
	'type' => 'fruit',
	'name' => $this->arr([
		'tomato',
		'mango',
		'lichee',
		'pineapple'
	])
  ]
]

If the range is larger than the number of array elements (like 1-6), then null will be returned.

There is also an optional second parameter. It's called $wrap. If you set it to true, the seeder will just start from the beginning again.

return [
  '1-5' => [
	'type' => 'fruit',
	'name' => $this->arr([
		'fruit X',
		'fruit Y'
	], true)
  ]
]

will result in

| name | type | |---------|-----------| | fruit X | fruit | | fruit Y | fruit | | fruit X | fruit | | fruit Y | fruit | | fruit X | fruit |

String Interpolation

Inheritance

We could ofcourse just write an average string and go your merry way but we threw in a few extra magic just incase. Lets start with an example:

return [
  '1-10' => ['name' => 'Potato', 'price' => 30],
  '5-10' => ['name' => 'Super {inherit}', 'price' => 100]
]

{inherit} will be replaced with "Potato". It means all the rows 6 from 5 to 10 will be populated with Super Potato in their name fields.

Referencing a Field

What if we want to interpolate in another field within the row? SeedCascade has got us covered!

return [
    '1-10' => [
        'name' => '{self.type} Engine ({self.model})',
        'type' => 'Jet',
        'model' => 'C3'
    ]
];

This will insert 10 rows into the database with all their name fields being Jet engine (C3).

This feature really shines when the current definition block doesn't really have the certain property being refferenced. Eg:

return [
    '1-10' => [
        'type' => 'Jet'
    ],
    '1-5' => [
        'name' => '{self.type} Fuel'
    ],
    '6-10' => [
        'name' => '{self.type} Engine'
    ]
];

Remmeber the "Cascade" part? So now, we'll have 10 rows in the database. the first 5 being Jet Fuel and the last five being Jet Engine and all of them will have a type of Jet.

Explicitly Inherit a field

Wanna make sure you get the value from a larger raneg higher up? Have a look:

return [
  '1-10' => ['color' => 'Red'],
  '6-10' => [
    'name' => '{inherit.color} Flower',
    'color' => 'Yellow'
  ]
]

the last 5 rows will have a name of 'Red Flower' NOT 'Yellow Flower'

Iteration Count

You can also use {i} that has the current iteration count.

return [
    '1-5' => ['username' => 'user_{i}']
]

This will generate 5 rows with username set to: user_1, user_2, user_3, user_4, user_5 respectively.

Note: Iteration count starts from 1.

Closures

Sometimes you need more power! Maybe because you're greedy? jk jk lol. Values can be closures too.

return [
    '1-10' => [
        'order' => function () {
            return rand(1, 100);
        }
    ]
];

This will insert 10 rows with the value for order being a random integer returned by the closure we provided.

Parameters

Closures recieve 3 parameters.

• $i - The Iteration Count.
• $self - An object taht lets you access other field values.
• $inherit - An objects that allows you to inherit field values.

$i

The use of $i is obvious. Heres the username example with closures:

return [
    '1-5' => [
        'username' => function ($i) {
            return 'user_'.$i;
        }
    ]
];

$self

The $self object has magic methods implemented that allows dynamic refferencing of properties.

return [
    '1-3' => [
        'type' => 'admin'
        'username' => function ($i, $self) {
            return $self->type . '_' . $i;
        }
    ]
];

this will insert 3 rows with username being admin_1, admin_2, admin_3.

$inherit

The $inherit object can both be invoked like $inherit() or concatenated or interpolated into a string like 'super_'.$inherit or "super_$inherit" and all will result in the same value.

return [
    '1-n' => [
        'price' => 10
    ],
    '6-10' => [
        'price' => function ($i, $self, $inherit) {
            return $inherit() * 2;
        }
    ]
];

the last 5 rows will have twice the price as the first 5 rows.
string on the other hand may directly be mixed in like:

return [
    '1-n' => [
        'type' => 'admin'
    ],
    '6-10' => [
        'type' => function ($i, $self, $inherit) {
            return "super_$inherit";
            // or
            return "super_".$inherit;
        }
    ]
];

Inheriting other fields is also supported:

return [
  '1-n' => [
    'username' => 'user_{i}'
  ],
  '6-10' => [
    'hash' => function ($i, $self, $inherit) {
      return md5($inherit->username);
    }
  ]
];

Bound Closures

Want closures that refference the seeder class' properties or called a seeder class method? Checkout the local(Closure $closure) method.

class DatabaseSeeder extends SeedCascade
{
  public $table = "magic";
  protected $meaning_of_life = 42;

  public function seedSheet()
  {
    return [
      '1-10' => [
        'lucky_number' => $this->local(function () {
          return $this->meaning_of_life * rand(1,10)
        })
      ]
    ];
  }
}

YES. The $meaning_of_life is available inside the closure. MAGIC. Local closures also passed the same parameters as average closures. $i, $self & $inherit.

Using Methods

Let's convert the above example to use a class method instead.

class DatabaseSeeder extends SeedCascade
{
  public $table = "magic";
  protected $meaning_of_life = 42;

  protected function life() {
    return $this->meaning_of_life * rand(1, 10);
  }

  public function seedSheet()
  {
    return [
      '1-10' => [
        'lucky_number' => $this->method('life')
      ]
    ];
  }
}

Constructors & Faker

SeedCascade doesn't mind you defining constructors (or destructors). Heres an example that uses Faker:

class DatabaseSeeder extends SeedCascade
{
    public $table = "people";
    protected $faker = null;

    public function __construct()
    {
        $this->faker = new Faker;
    }

    public function seedSheet()
    {
        return [
            '1-10' => [
                'name' => $this->local(function () {
                    return $this->faker->name;
                })
            ]
        ];
    }
}

Order of Evaluation

SeedCascade will start evaluating with the most specific range. Meaning 1-10 will be evaluated first before 1-20 or 1-Infinity.

Inheritance will also depend on this. If you {inherit} inside the range 1-10 the value interpolated will be resolved from the range 1-20. If the super range does not have the property it will just traverse backwards till it find a larger range that defines the property.

If no higher ranges define the property {inherit} will become null.