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Example code of yii2tech/ar-linkmany

Informations about the package ar-linkmany

ActiveRecord Many-to-Many Saving Extension for Yii2


This extension provides support for ActiveRecord many-to-many relation saving. For example: single "item" may belong to several "groups", each group may be linked with several items. Unlike regular [[\yii\db\BaseActiveRecord::link()]] usage, this extension automatically checks references existence, removes excluded references and provide support for web form composition.

For license information check the LICENSE-file.

Latest Stable Version Total Downloads Build Status

Installation

The preferred way to install this extension is through composer.

Either run

or add

to the require section of your composer.json.

Usage

This extension provides support for ActiveRecord many-to-many relation saving. This support is granted via [[\yii2tech\ar\linkmany\LinkManyBehavior]] ActiveRecord behavior. You'll need to attach it to your ActiveRecord class and point the target "has-many" relation for it:

Being attached [[\yii2tech\ar\linkmany\LinkManyBehavior]] adds a virtual proprty to the owner ActiveRecord, which name is determined by [[\yii2tech\ar\linkmany\LinkManyBehavior::$relationReferenceAttribute]]. You will be able to specify related models primary keys via this attribute:

The above example is equal to the following code:

Attention: do NOT declare relationReferenceAttribute attribute in the owner ActiveRecord class. Make sure it does not conflict with any existing owner field or virtual property.

Virtual property declared via relationReferenceAttribute serves not only for saving. It also contains existing references for the relation:

You may as well edit the references list for existing record, while saving linked records will be synchronized:

Note: if attribute declared by relationReferenceAttribute is never invoked for reading or writing, it will not be processed on owner saving. Thus it will not affect pure owner saving.

Creating relation setup web interface

The main purpose of [[\yii2tech\ar\linkmany\LinkManyBehavior::$relationReferenceAttribute]] is support for creating many-to-many setup web interface. All you need to do is declare a validation rule for this virtual property in your ActiveRecord, so its value can be collected from the request:

Inside the view file you should use relationReferenceAttribute property as an attribute name for the form input:

Inside the controller you don't need any special code:

All versions of ar-linkmany with dependencies

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