I have a User
model which has an attribute type
among other attributes. Type is used to identify parents and children.
Parent and children (students) have many-to-many relationship. Also students belong to one or many groups (model Group
).
User model
/**
* Filter the scope of users to student type.
*
* @param $query
*/
public function scopeStudent($query){
$query->where('type', '=', 'std');
}
/**
* Filter the scope of users to parent type.
*
* @param $query
*/
public function scopeParent($query){
$query->where('type', '=', 'prt');
}
/**
* List of groups the user is associated with.
*
* @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
*/
public function groups(){
return $this->belongsToMany('\App\Group', 'group_user_assoc')
->withTimestamps();
}
/**
* List of students associated with the user(parent).
*
* @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
*/
public function children(){
return $this->belongsToMany('\App\User', 'student_parent_assoc', 'parent_id', 'student_id')
->withPivot('relation');
}
/**
* List of parents associated with the user(student).
*
* @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
*/
public function parents(){
return $this->BelongsToMany('\App\User', 'student_parent_assoc', 'student_id', 'parent_id')
->withPivot('relation');
}
The aforementioned relations are working correctly.
Below are my association tables.
student_parent_assoc
----------------------
+------------+------------------+------+-----+
| Field | Type | Null | Key |
+------------+------------------+------+-----+
| student_id | int(10) unsigned | NO | PRI |
| parent_id | int(10) unsigned | NO | PRI |
| relation | varchar(25) | YES | |
+------------+------------------+------+-----+
group_user_assoc
----------------------
+------------+------------------+------+-----+
| Field | Type | Null | Key |
+------------+------------------+------+-----+
| group_id | int(10) unsigned | NO | MUL |
| user_id | int(10) unsigned | NO | MUL |
| created_at | timestamp | NO | |
| updated_at | timestamp | NO | |
+------------+------------------+------+-----+
I need to find students who do not belong to any group along with their parents. I have managed to find students like so
$students = User::student()
->whereDoesntHave('groups')
->get();
Question: Now I want to find parents of these students. But I am not able to build an eloquent query for the same. How do I do it?
Note: I could get collection of students from above query and run a foreach
loop to get their parents like so
$parents = new Collection;
foreach($students as $student) {
foreach($student->parents as $parent) {
$parents->push($parent);
}
}
$parents = $parents->unique();
But somehow I don't think it's very performant when I have to loop through hundreds of objects. Handling this at query level would be much faster.
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