How to get the most favourited items, from another table? - php

Question

So, there's the User model, and the Item model. It's a many-to-many relation: an item can belong to many users, and a user can have many items. Therefore, there's the UserItemRel model.
To summarize:
item
id
name
date_created
date_updated
user
id
email
password
date_created
date_updated
user_item_rel
user_id
item_id
date_created
My query, before making the switch to Yii2, was this:
SELECT COUNT(UIR.`user_id`) as `favourited`, IT.`id`, IT.`name`, CA.`name` as `category`
FROM `user_item_rel` UIR
LEFT JOIN `item` IT ON UIR.`item_id` = IT.`id`
LEFT JOIN `category_item` CI ON UIR.`item_id` = CI.`item_id`
LEFT JOIN `category` CA ON CI.`category_id` = CA.`id`
WHERE UIR.`date_created` >= (SYSDATE() - INTERVAL 3 YEAR)
GROUP BY UIR.`item_id`
ORDER BY
`favourited` DESC
LIMIT 20
I've used the yii2-enhanced-gii extension to generate the models.
I want to show the 20 most favourited items in the past 48 hours, with their counts. I'm migrating from Yii1.1, and it's been quite the ride so far, and I can't figure this out.
I've found
$this->hasMany(UserItemRel::className(), ['id' => 'user_id'])
->viaTable('user_item_rel', ['id' => 'item_id'], function ($query) {
$query->andWhere(['date_created < INTERVAL 2 DAY'])
->orderBy(['COUNT(*)' => SORT_DESC]);
});
}
but how to properly use this?

Answer 1

The query would something like bellow. I would try to run a native query instead of trying to find out how this could be done withing the orm.
SELECT item_id, item.name, count(*) favorite
FROM user_item_rel
LEFT JOIN user ON user.id = user_item_rel.user_id
LEFT JOIN item ON item.id = user_item_rel.item_id
WHERE user_item_rel.date_created >= (sysdate() - interval 2 DAY)
GROUP BY item_id, name
ORDER BY favorite DESC
LIMIT 20

Answer 2

You might be able to try something like this:
$items = UserItemRel::find()
->asArray()
->select("COUNT(`user_id`) as favourited, `item_id`")
->groupBy("item_id")
->joinWith("item")
->orderBy("favourited DESC")
->indexBy("item_id")
->where("'date_created' >= '".date("Y-m-d", strtotime("-2 days"))."'")
->limit(3)
->all();
In my testing it gives me something like this:
Array
(
[1] => Array
(
[favourited] => 4
[item_id] => 1
[item] => Array
(
[id] => 1
[name] => Donec
[date_created] => 2015-08-26
[date_updated] => 2015-08-26
)
)
[8] => Array
(
[favourited] => 3
[item_id] => 8
[item] => Array
(
[id] => 8
[name] => Tellus
[date_created] => 2015-08-26
[date_updated] => 2015-08-26
)
)
[7] => Array
(
[favourited] => 2
[item_id] => 7
[item] => Array
(
[id] => 7
[name] => Mollis
[date_created] => 2015-08-26
[date_updated] => 2015-08-26
)
)
)