Sort an Eloquent model - laravel

Question

Table for MyModel is like below
id name parent_id
--------------------------
1 parent1 null
2 p1-c1 1
3 parent2 null
4 p1-c1-g1 2
5 p2-c1 3
6 p1-c1-g1-f1 4
7 parent3 null
8 p1-c2 1
9 p3-c1 7
10 p1-c2-c1 8
How order with eloquent or raw DB query without getting all rows like below
Collection {#499 ▼
#items: array:22 [▼
0 => MyModel {#524 ▶} // parent1
1 => MyModel {#525 ▶} // p1-c1
2 => MyModel {#526 ▶} // p1-c1-g1
3 => MyModel {#527 ▶} // p1-c1-g1-f1
4 => MyModel {#528 ▶} // p1-c2
5 => MyModel {#529 ▶} // p1-c2-c1
6 => MyModel {#530 ▶} // parent2
7 => MyModel {#531 ▶} // p2-c1
8 => MyModel {#532 ▶} // parent3
9 => MyModel {#533 ▶} // p3-c1
]
}
for a better view and understanding
parent1
p1-c1
p1-c1-g1
p1-c1-g1-f1
p1-c2
p1-c2-c1
parent2
p2-c1
parent3
p3-c1

Answer 1

use Recursive relationship to same table
For example if model name is MyModel then the relationship will be
public function child(){
return $this->hasMany(MyModel::class,'parent_id','id');
}
public function recursiveChild(){
return $this->child()->with('recursiveChild');
}
So in your controller
MyModel::with(['recursiveChild'])->get();

Answer 2

What is your actual code, what are you trying to accomplish with this?
Collections are your friend in Laravel.
You can do a groupBy or using a With if you have a table that's related... your question is really too ambiguous.
You can get fairly complex with many chained Where orWhere with limits and groupBy
What I do see is that you need to have is not only the parent in the db but you also need a sort order on the children. Another thought is do you need a Grandparent, Parent, child? In that case you're going to have to have columns for all of those to know who they belong to when building your collection or doing just a straight eloquent pull.
My guess is this is for a menu or something you have here. Again ambiguity, so totally guessing.
EDIT
I've done this kind of thing in several apps...
You're table is going to look something like this:
id, name, menu_type, url, page_id, parent_id, sidebar, order, depth, role, created_at, updated_at, deleted_at
So in your model your going to want to do a relationship:
public function parent()
{
return $this->belongsTo('App\Models\Menus', 'parent_id');
}
public function children()
{
return $this->hasMany('App\Models\Menus', 'parent_id')->orderBy('order', 'asc');
}
Then what I've done is use this as a trait so it's available wherever I need to use it.
The trait is a little more complex than you are asking but it points you in the direction.
public function PrimaryMenu($pageid , $namespace, $user) {
// Get all primary menu items.
$appspace = "\App\Models\\".$namespace."\\Menus";
$roles = $user->roles->pluck('name');
$pmenus = $appspace::with('children')->where([['menu_type', '=', 'primary'],['parent_id','=', NULL]])->
where(function ($q) use($pageid) {
$q->where('page_id', '=', $pageid)->orWhere('page_id', NULL);
})->
where(function ($q2) use($roles) {
$q2->whereIn('role', $roles)->orWhere('role', '=', NULL);
})->
get();
return $pmenus;
}
You can see I'm checking a type of menu (this can be anything as long as you have something to group them by category) in this case primary, then I check for the page and see if we should include a row or not on the page then I check for any roles the user might have that we should include items.
Then in your controller it's just a matter of using the trait at the top:
use App\Traits\CommonTrait;
Now all of those traits are available to use in your controller. So you just call the function you need:
$pmenus = $this->PrimaryMenu($pageid, $namespace, $user);
You can see I'm sending along 3 variables to this as I have this set up for having many menus. Really the code translates to anything though that you want children associated with a parent.
The important bits are the model actions on relationships.

Answer 3

Thanks everyone, i used this package to achieve a sort like that.
https://github.com/lazychaser/laravel-nestedset#building-flat-tree