At this point, we have an “anonymous” Symfony 2 bundle.
Let’s start by creating the structure for our Field Type. To make it easier to move around the code, we will to some extent mimic the structure that is used in the kernel. Native Field Types are located inside ezpublish-kernel (in vendor/ezsystems), in the
eZ/Publish/Core/FieldType folder. Each Field Type has its own subfolder:
TextLine,
Email,
Url, etc. We will use a structure quite close to this.
From the tutorial repository, list the contents of the
eZ/Publish/FieldType folder:
eZ
└── Publish
└── FieldType
└── Tweet
├── Type.php
└── Value.php
We have the two base classes required by a Field Type:
Type
and
Value.
The Type class
The Type contains the logic of the Field Type: validating data, transforming from various formats, describing the validators, etc.
A Type class must implement
eZ\Publish\SPI\FieldType\FieldType . It may also extend the
eZ\Publish\Core\FieldType\FieldType abstract class.
The Value class
The Value is used to represent an instance of our type within a Content item. Each Field will present its data using an instance of the Type’s Value class.
A value class must implement the
eZ\Publish\SPI\FieldType\Value
interface. It may also extend the
eZ\Publish\Core\FieldType\Value
abstract class.
