get count with hasMany not working yii2 - count

Question

I have CLub model (clubs) hasMany with User model like
Club n-n User
and I have UserClub model with columns: id, club_id, user_id, etc
In Club model
public function getCountUsers()
{
return $this->hasMany(UserClub::className(), ['club_id'=>'id'])->count();
}
I wanna count all User on Club as code:
$query = Club::find()
->joinWith(['countUsers']);
// ->with('countUsers');
->all();
so it is not working and throwing an error
Club has no relation named \"countUsers\"."

Answer 1

Because it isn't a relation as it does not return a model object or an array of model objects, instead you are using ->count() that makes it return a string that contains the total count for the user against the club.
If you are looking to get a count for the users against all the Clubs you can use the currently defined relation like $club->countUser see below.
$clubs=Club::find()->all();
foreach($clubs as $club){
echo $club->countUser;
}
or change the relation to
public function getCountUser(){
return $this->hasMany(UserClub::className(), ['club_id'=>'id']);
}
and use it like
$clubs=Club::find()->all();
foreach($clubs as $club){
echo count($club->countUser);
}
or like below
$clubs=Club::find()->all();
foreach($clubs as $club){
echo $club->getCountUser()->count();
}
EDIT
You are actually trying to transform the following query using ActiveRecord as far as I understood from the discussion.
SELECT clubs.id, count(user_clubs.id) as total
FROM
clubs
left join user_clubs on clubs.id = user_clubs.club_id
group by clubs.id
if that is correct you can use the following
Clubs::find ()
->alias ( 'c' )
->select ( [ new \yii\db\Expression ( 'c.[[id]], count(uc.[[id]]) as total' ) ] )
->leftJoin ( '{{%user_clubs}} uc' , 'uc.club_id=c.id' )
->groupBy ( 'c.id' )
->all ();
Note : You have to do one more thing you have to add a public property $total inside your Club model and add it to safe rules, because you are selecting the count as an alias total and until unless you define it inside the model the result set won't show you the count, so add the following inside the Club model.
public $total;
under rules
[[other fields...,'total'] , 'safe' ] ,
EDIT2
For some reason, I have a feeling that you are trying to count by specifying a relation instead of specifying the ->leftJoin () with the table user_clubs in the query.
If that is so then you have to change your relation getUserCount() you should better give a meaningful name that describes it. i would rename it to getClubUsers()
public function getClubUsers(){
return $this->hasMany(UserClub::className(), ['club_id'=>'id']);
}
After this, you still have to declare a public property $total as I described before inside your Club model, and add it to safe rules.
Now you can write your query in the following way
Clubs::find ()
->alias ( 'c' )
->select ( [ new \yii\db\Expression ( 'c.[[id]], count(cu.[[id]]) as total' ) ] )
->joinWith( ['clubUsers cu'] )
->groupBy ( 'c.id' )
->all ();

Answer 2

You can do this with join, in my case i get users who have more than 0 referrals.
$users = User::find()->with('referrals')
->from(User::tableName() . ' t')
->join('left join',User::tableName().' r','r.Deeplink = t.ReferralID')
->select('t.*,count(r.ID) as ct')
->groupBy('t.ID')
->andFilterHaving(['>','ct',0])
->all();

Answer 3

Hi your relation is correct check you error Club has no relation named \"countUsers\"."
Means you are calling a relation which not exist :
change query like this, Relation name should be in Club Model
public function getCount(){
return $this->hasMany(UserClub::className(), ['club_id'=>'id']);
}
$clubs=Club::find()->all();
foreach($clubs as $club){
echo count($club->getCount);
}
$query = Club::find()
->joinWith(['count']);
// ->with('countusers');
->all();
If you want count just do like this .
Load the Club model .
$club_model = Club::find()
$count = club_model->count;