The Value class of a FieldType is by design very simple. It is meant to be stateless, and as lightweight as possible. Therefore, this class must contain as little logic as possible, as this is the Type class responsibility.
The Value will at least contain:
public properties, used to store the actual data
an implementation of the
__toString()method (required by the Value interface we inherit from)
By default, the constructor from FieldType\Value will be used, and allows you to pass a hash of property / value pairs. In our example, we can see that we can override it as well if we want.
The Tweet FieldType is going to store three things:
The tweet’s URL
The tweet’s author URL
The body, as an HTML string
At this point, we don’t care where those are stored. All we care about is what we want our FieldType to expose as an API. We end up with the following properties:
The only thing left to honor the
FieldType\Value interface is the
__toString() method. Let’s say that ours will return the tweet’s URL: