A field is a named element in the returned array by
ArrayableTrait::toArray.
This method should return an array of field names or field definitions.
If the former, the field name will be treated as an object property name whose value will be used
as the field value. If the latter, the array key should be the field name while the array value should be
the corresponding field definition which can be either an object property name or a PHP callable
returning the corresponding field value. The signature of the callable should be:
php
function ($model, $field) {
return field value
}
For example, the following code declares four fields:
-
email: the field name is the same as the property name
email;
-
firstName and
lastName: the field names are
firstName and
lastName, and their
values are obtained from the
first_name and
last_name properties;
-
fullName: the field name is
fullName. Its value is obtained by concatenating
first_name
and
last_name.
php
return [
'email',
'firstName' => 'first_name',
'lastName' => 'last_name',
'fullName' => function () {
return $this->first_name . ' ' . $this->last_name;
},
];
In this method, you may also want to return different lists of fields based on some context
information. For example, depending on the privilege of the current application user,
you may return different sets of visible fields or filter out some fields.
The default implementation of this method returns the public object member variables indexed by themselves.
