Yii2 Active Record Save Relations Behavior
==========================================
Automatically validate and save related Active Record models.

[![Latest Stable Version](https://poser.pugx.org/la-haute-societe/yii2-save-relations-behavior/v/stable)](https://packagist.org/packages/la-haute-societe/yii2-save-relations-behavior) [![Total Downloads](https://poser.pugx.org/la-haute-societe/yii2-save-relations-behavior/downloads)](https://packagist.org/packages/la-haute-societe/yii2-save-relations-behavior) [![Latest Unstable Version](https://poser.pugx.org/la-haute-societe/yii2-save-relations-behavior/v/unstable)](https://packagist.org/packages/la-haute-societe/yii2-save-relations-behavior) [![License](https://poser.pugx.org/la-haute-societe/yii2-save-relations-behavior/license)](https://packagist.org/packages/la-haute-societe/yii2-save-relations-behavior)

Features
--------
- Both `hasMany()` and `hasOne()` relations are supported
- Works with existing as well as new related models
- Composite primary keys are supported
- Only pure Active Record API is used so it should work with any DB driver

Installation
------------

The preferred way to install this extension is through [composer](http://getcomposer.org/download/).

Either run

```
php composer.phar require --prefer-dist la-haute-societe/yii2-save-relations-behavior "*"
```

or add

```
"la-haute-societe/yii2-save-relations-behavior": "*"
```

to the require section of your `composer.json` file.


Configuring
-----------

Configure model as follows
```php
use lhs\Yii2SaveRelationsBehavior\SaveRelationsBehavior;

class Project extends \yii\db\ActiveRecord
{
    public function behaviors()
    {
        return [
            'timestamp'     => TimestampBehavior::className(),
            'blameable'     => BlameableBehavior::className(),
            ...
            'saveRelations' => [
                'class'     => SaveRelationsBehavior::className(),
                'relations' => ['users', 'company']
            ],
        ];
    }

    public function transactions()
    {
        return [
            self::SCENARIO_DEFAULT => self::OP_ALL,
        ];
    }

    ...


    /**
     * @return ActiveQuery
     */
    public function getCompany()
    {
        return $this->hasOne(Company::className(), ['id' => 'company_id']);
    }

    /**
     * @return ActiveQuery
     */
    public function getProjectUsers()
    {
        return $this->hasMany(ProjectUser::className(), ['project_id' => 'id']);
    }

    /**
     * @return ActiveQuery
     */
    public function getUsers()
    {
        return $this->hasMany(User::className(), ['id' => 'user_id'])->via('ProjectUsers');
    }

}
```
> Though not mandatory, it is highly recommended to activate the transactions for the owner model.


Usage
-----

Every declared relations in the `relations` behavior parameter can now be set and saved as follow:
```php
$project = new Project();
$project->name = "New project";
$project->company = Company::findOne(2);
$project->users = User::findAll([1,3]);
$project->save();
```
You can set related model by only specifying its primary key:
```php
$project = new Project();
$project->name = "Another project";
$project->company = 2;
$project->users = [1,3];
$project->save();
```
You can even set related models as associative arrays like this:

```php
$project = Project::findOne(1);
$project->company = ['name' => 'GiHub', 'description' => 'Awesome']; // Will create a new company record
// $project->company = ['id' => 3, 'name' => 'GiHub', 'description' => 'Awesome']; // Will update an existing company record
$project->save();
```
Attributes of the related model will be massively assigned using the `load() method. So remember to declare the according attributes as safe in the rules of the related model.

> **Notes:**
> - Related models are saved during the EVENT_BEFORE_VALIDATE event of the owner model. Transaction will start at this point according to the transactions() method of the model.
> - Only newly created or changed related models will be saved.

> See the PHPUnit tests for more examples.

Validation
----------
Every declared related models will be validated prior to be saved. If any validation fails, for each related model attribute in error, an error associated with the named relation will be added to the owner model.

For `hasMany()` relations, the index of the related model will be used to identifiy the associated error message.


> **Tips :**
> For relations not involving a junction table by using the `via()` or `viaTable()` methods, you should remove the attributes pointing to the owner model to be able to pass the validations.