How to groupBy and count the pivot table in laravel? - laravel

Question

I have three tables,
User cities user_cities
id name title id name user_id city_id
1 aaa designer 1 cityA 2 1
2 bbb developer 2 cityB 2 2
3 ccc designer 3 cityC 1 2
1 1
2 3
3 2
After joining and querying the database my result is,
data: {
0: {
id: 1
name: aaa,
title: designer,
cities :[
0: {
id: 1,
name: cityA
}
1: {
id: 2,
name: cityB
}
2: {
id: 3,
name: cityC
}
]
},
1: {
id: 2
name: bbb,
title: developer,
cities :[
0: {
id: 1,
name: cityA
}
1: {
id: 2,
name: cityB
}
]
}
1: {
id: 3
name: ccc,
title: designer,
cities :[
0: {
id: 2,
name: cityB
}
]
}
}
Everything is fine until here. But i want to groupBy by cities and take count.
If i filter by title=designer the filtered data will display and i want to make group by cities and take count of it.
So my final result will be,
cityA = 1 counts
cityC = 2 counts
Help me to solve the problem.

Answer 1

You might use the withCount to eager load the relationship counts.
I assume you already have the cities relationship defined in the User.php model:
class User
{
public function cities()
{
return $this->belongsToMany(City::class);
}
}
Then:
$users = User::withCount('cities')->get();
I think the results are gonna be:
data: {
0: {
id: 1
name: aaa,
title: designer,
cities_count: 3
},
1: {
id: 2
name: bbb,
title: developer,
cities_count: 2
}
1: {
id: 3
name: ccc,
title: designer,
cities_count: 1
}
}
An alternative could be using lazy eager loading:
$users = User::all()->loadCount('cities');