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title: Working With Entities layout: docs_page date: 2014-08-14 09:34:30

Entity classes can be named and namespaced however you want to set them up within your project structure. For the following examples, the Entities will just be prefixed with an Entity namespace for easy psr-0 compliant autoloading.

Defining An Entity

The minimal required definition of an entity defines the $table and the fields, and extends from Spot\Entity:

<?php
namespace Entity;

class Post extends \Spot\Entity
{
    protected static $table = 'posts';

    public static function fields()
    {
        return [
            'id'           => ['type' => 'integer', 'primary' => true, 'autoincrement' => true],
            'title'        => ['type' => 'string', 'required' => true],
            'body'         => ['type' => 'text', 'required' => true],
            'status'       => ['type' => 'integer', 'default' => 0, 'index' => true],
            'author_id'    => ['type' => 'integer', 'required' => true],
            'date_created' => ['type' => 'datetime', 'value' => new \DateTime()]
        ];
    }
}

Field Options

All of the DBAL schema column options can be used for field attributes, and will be passed to DBAL when creating the table structure through migrations. Spot adds some additional field attributes like `required` and `value` as well.

Primary Keys

In the above "Post" entity, the primary key is defined on the id field with a 'primary' => true attribute on the field definition. If the primary key is also an auto-increment column, you must also add a 'autoincrement' => true attribute.

The full required definition looks like this:

'id' => ['type' => 'integer', 'primary' => true, 'autoincrement' => true]

Indexes

An index can be defined on an entity field by adding the 'index' => true attribute.

'status' => ['type' => 'integer', 'index' => true]

Many times, it is desirable to create a compound index with more than one column. In Spot, simply give the index attribute a name that is shared with another column, and a compound index will be created using all columns with the same index name.

'lat' => ['type' => 'decimal', 'index' => 'geolocation']
'lng' => ['type' => 'decimal', 'index' => 'geolocation']

Unique Columns

Similar to defining an index, you must add a 'unique' => true to specify a single field as requiring a unique value:

'email' => ['type' => 'string', 'required' => true, 'unique' => true]

And also just like normal indexes, compound unique indexes can be created by using a shared name:

'email'    => ['type' => 'string', 'required' => true, 'unique' => 'user_email']
'username' => ['type' => 'string', 'required' => true, 'unique' => 'user_email']
To detect duplicate values and return a friendly error message instead of an exception from the database engine, Spot will automatically attempt to find existing entities with duplicate values you are passing when a field is marked as `unique`. This happens in the `validate` method of `Spot\Mapper` that is run before every insert and update operation. This results in _one extra query on insert or update_ for each unique column or compound column group.

Required Fields

A required field can be enforced on save, create, and update using a 'required' => true attribute.

'email' => ['type' => 'string', 'required' => true]

Validation

It is possible to define validation rules within entity fields definition. Validation will be done just before persisting an object into database.

'email' => ['type' => 'string', 'required' => true, 'validation' => ['email' => true]],
'age' => ['type' => 'integer', 'validation' => [
    'integer' => true, 'min' => 18
]]

You can find further documentation about available validators within Valitron project (Built-in Validation Rules).