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https://github.com/2amigos/yii2-translateable-behavior

Handles ActiveRecord's attribute translations
https://github.com/2amigos/yii2-translateable-behavior

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Handles ActiveRecord's attribute translations

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TranslateableBehavior for Yii2

==============================



This behavior has been inspired by the great work of Mikehaertl's

[Translatable Behavior](https://github.com/mikehaertl/translatable) for Yii 1.*.



It eases the translation of ActiveRecord's attributes as it maps theme from a translation table into the main record. It

also automatically loads application language by default.



Sample of use:



```php

title = "English title";



// save both the new Tour and a related translation record with the title

$tour->save();



// change language

$tour->language = 'fr';



$tour->title = "French title";



// save translation only

$tour->saveTranslation();



```



Installation

------------



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



Either run



```

php composer.phar require "2amigos/yii2-translateable-behavior"

```

or add



```json

"2amigos/yii2-translateable-behavior" : "~1.1"

```



to the require section of your application's `composer.json` file.



Usage

-----



### Preparation



First you need to move all the attributes that require to be translated into a separated table. For example, imagine we

wish to keep translations of title and description from our tour entity. Our schema should result on the following:



```

    +--------------+        +--------------+        +-------------------+

    |     tour     |        |     tour     |        |      tour_lang    |

    +--------------+        +--------------+        +-------------------+

    |           id |        |           id |        |                id |

    |        title |  --->  |   created_at |   +    |           tour_id |

    |  description |        |   updated_at |        |          language |

    |   created_at |        +--------------+        |             title |

    |   updated_at |                                |       description |

    +--------------+                                +-------------------+



```



After we have modified our schema, now we need to define a relation in our `ActiveRecord` object. The following example

assumes that we have already created a `TourLang` model (see the schema above):



```php

/**

* @return \yii\db\ActiveQuery

*/

public function getTranslations()

{

    return $this->hasMany(TourLang::className(), ['tour_id' => 'id']);

}

```



Finally, we need to attach our behavior.



```

use dosamigos\translateable\TranslateableBehavior;



\\ ...



public function behaviors()

{

    return [

        'trans' => [ // name it the way you want

            'class' => TranslateableBehavior::className(),

            // in case you named your relation differently, you can setup its relation name attribute

            // 'relation' => 'translations',

            // in case you named the language column differently on your translation schema

            // 'languageField' => 'language',

            'translationAttributes' => [

                'title', 'description'

            ]

        ],

    ];

}

```



### Basic Usage



```php

// create a record

$tour = new Tour;

$tour->title = "English title";



// save both the new Tour and a related translation record with the title

$tour->save();



// change language

$tour->language = 'fr';



$tour->title = "French title";



// save fr translation only

$tour->saveTranslation();

```



You may also set multiple translations directly:



```php

$tour = new Tour;

$tour->title = [

  'translations' => [

     'en' => "English title",

     'de' => "Deutscher Titel",

  ],

];



// save both the new Tour and a related translation record with the title

$tour->save();

```



### Fallback language



In case no translation is available for a specific language the behavior allows to specify a fallback translation to load instead.

By default the fallback will use the application source language. It can be configured by setting the `fallbackLanguage` property of the behavior.



Fallback language can be configured to be a single language or per language:



```php

// use english as fallback for all languages when no translation is available

'fallbackLanguage' => 'en',

// alternatively:

'fallbackLanguage' => [

    'de' => 'en', // fall back to English if German translation is missing

    'uk' => 'ru', // fall back to Russian if no Ukrainian translation is available

],

```



Additionally to the configurable fallback a fallback to non-localized language is applied automatically.

E.g. if no translation exists for `de-AT` (German in Austria) the translation will fall back to `de`.

The fallback goes further if `de` is not found using the `fallbackLanguage` configuration, so from the example

above it will then try `en`.



When the fallback is defined in array format and no fallback can be found for a language, the first fallback is returned.



You may disable the fallback mechanism by setting `fallbackLanguage` to `false`.



If you want to configure fallback languages globally, you can do so by configuring the `TranslateableBehavior` class

in Yii DI container:



```php

Yii::$container->set('dosamigos\translateable\TranslateableBehavior', ['fallbackLanguage' => 'de']);

```



### Deleting translations



By default, when an active record is deleted, translation records are deleted in the `afterSave` event.

However some database scenarios require different configuration, in case foreign keys restrict the deletion of records.



You may configure `'deleteEvent'` to be either `ActiveRecord::EVENT_BEFORE_DELETE` or `ActiveRecord::EVENT_AFTER_DELETE` to

control on which event the deletion of records should be performed.

You may set `'deleteEvent'` to `false` to disable deletion and rely on DB foreign key cascade or implement your own method.



When using the Translateablebehavior in an ActiveRecord you should enable [transactions()](https://www.yiiframework.com/doc/api/2.0/yii-db-activerecord#transactions()-detail)

for the delete operation.



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