yii2 Setting read-only property: yii\data\Pagination::limit - php

Question

I am trying to set the limit on my active data provider in Yii2 in the pagination to 5 records. Accordingly to THIS documentation, the $limit property is available, but I am getting this error:
Setting read-only property: yii\data\Pagination::limit
And my code is this:
$dataProvider = new ActiveDataProvider([
'query' => Order::find()
->where(['user_id' => $user_id]),
'sort' =>[
'defaultOrder' => [
'id' => SORT_DESC
]
],
'pagination' => [
'pageSize' => 20,
'limit' => 5,
],
]);
And my question is this: Why does this happen? The pageSize works if I erase the limit everything goes smooth... On limit everything fails... How can I solve this?
L.E: I found the source method that throws this error, in case it helps:
/**
* Sets value of an object property.
*
* Do not call this method directly as it is a PHP magic method that
* will be implicitly called when executing `$object->property = $value;`.
* #param string $name the property name or the event name
* #param mixed $value the property value
* #throws UnknownPropertyException if the property is not defined
* #throws InvalidCallException if the property is read-only
* #see __get()
*/
public function __set($name, $value)
{
$setter = 'set' . $name;
if (method_exists($this, $setter)) {
$this->$setter($value);
} elseif (method_exists($this, 'get' . $name)) {
throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
} else {
throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
}
}
according to this, it seams I am trying to: getLimit() not setLimit()... any ideas why?

Answer 1

Pagination doesn't have property $limit,
#property integer $limit The limit of the data. This may be used to set the LIMIT value for a SQL statement
That value set by propery $pageSize.
If you need to get last 5 news and this must be work with pager you need something like this:
$dataProvider = new ActiveDataProvider([
'query' => Order::find()
->where(['user_id' => $user_id]),
'sort' =>[
'defaultOrder' => [
'id' => SORT_DESC
]
],
'pagination' => [
'pageSize' => 5,
],
]);

Answer 2

Many properties in Yii are read-only. There are 2 simple ways to find out whether a property is read only or not.
Using canSetProperty()
if there is a method with set prefix, for example setLimit()
On the other hand, you must set limit on your query, not pagination.

Answer 3

Maybe ArrayDataProvider will be better suited.
$query = new Query;
$provider = new ArrayDataProvider([
'allModels' => $query->from('post')->limit(5)->all(),
'key' => 'id',
'sort' => [
'defaultOrder' => [
'id' => SORT_DESC
]
]
]);

Answer 4

According to the Yii Guid Concept of Properties
A property defined by a getter without a setter is read only. Trying to assign a value to such property will cause an InvalidCallException. Similarly, a property defined by a setter without a getter is write only, and trying to read such property will also cause an exception. It is not common to have write-only properties.
There are several special rules for, and limitations on, the properties defined via getters and setters:
The names of such properties are case-insensitive. For example, $object->label and $object->Label are the same. This is because method names in PHP are case-insensitive.
If the name of such property is the same as a class member variable, the latter will take precedence. For example, if the above Foo class has a member variable label, then the assignment $object->label = 'abc' will affect the member variable 'label'; that line would not call the setLabel() setter method.
These properties do not support visibility. It makes no difference for the visibility of a property if the defining getter or setter method is public, protected or private.
The properties can only be defined by non-static getters and/or setters. Static methods will not be treated in the same manner.
So in other terms, there is no way do do this only with PHP. As it is said in the documentation, a thing that I just saw:
$limit public read-only property
integer getLimit( )
The limit of the data. This may be used to set the LIMIT value for a SQL statement for fetching the current page of data. Note that if the page size is infinite, a value -1 will be returned.
In order for this to work as expected, the code needs to become this:
$dataProvider = new ActiveDataProvider([
'query' => Order::find()
->where(['user_id' => $user_id])
->limit(5),
'sort' =>[
'defaultOrder' => [
'id' => SORT_DESC
]
],
'pagination' => false,
]);
Hope this helps others in my shoes!