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Laravel 10 Eloquent belongsTo not working

Using Laravel 10 and trying to get a belongsTo relationship to work and it’s not working. Basically a Fragment has one FragmentGroup while a FragmentGroup has many Fragments.

I’m using it this way and it’s giving me null:

$fragment = Fragment::find(1);
return $fragment->fragmentGroup->name;

class Fragment extends Model {

    public function fragmentGroup(): BelongsTo
    {
        return $this->belongsTo(FragmentGroup:class, 'FragmentID');
    }
}


class FragmentGroup extends Model  {

    public function medicine_type(): HasMany
    {
        return $this->hasMany(Fragment:class, 'FragmentGroupID');
    }
}

Database structure

Fragment:
   FragmentID
   FragmentGroupID
   Name

FragementGroup
   FragmentGroupID
   Name
Tags:

3

Answers


  1. 0

    The way you are using the method is not correct.

    Anyways, to use it you would need to change

    $fragment = Fragment::find(1);

    to

    $fragment = Fragment::with('fragmentGroup')->find(1); # or maybe with('fragment_group')

    $fragment should now have fragment_group as part of the collection.
    You can check if you dd($fragment);

    If you can see fragment_group but it has blank array/object as its value, then check the methods used inside model.

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  2. 0

    In your original code, there is a typing mistake in ‘FragmentGroup:class‘. It should be ‘FragmentGroup::class‘.

    Also, you can pass the foreign_key and local_key to further specify.

    Your function should be:

    class Fragment extends Model {

    public function fragmentGroup(): BelongsTo
    {
        return $this->belongsTo(FragmentGroup::class, 'FragmentID', 'FragmentGroupID');
    }
}


class FragmentGroup extends Model  {

    public function medicine_type(): HasMany
    {
        return $this->hasMany(Fragment::class, 'FragmentGroupID', 'FragmentID');
    }
}

    I think it will be solve your problem.

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  3. 0

    replace

    $fragment = Fragment::find(1);
return $fragment->fragmentGroup->name;

    to

    $fragment = Fragment::find(1);
return $fragment->fragmentGroup()->name;

    Since fragmentGroup doesn’t load automatically, you should access it not as an attribute (fragmentGroup), but through the fragmentGroup() method.

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