Laravel function in model

Question

I have a Laravel model with a simple function in it. But for some reason I get this error:

Relationship method must return an object of type Illuminate\Database\Eloquent\Relations\Relation

Here is my Model:

class Dish extends Model
{
    public function sum() {
        return $this->attributes['begin'] + 10;  
    }
}

In my controller I do:

$model->sum();

Anyone knows how I can add the function to my model?

Many thanks in advance!

Are you trying to load this as a relationship ? Like $model = Dish::with('sum')->where('id', 3)->first(); or something ? — SimonDepelchin
– SimonDepelchin, Commented Oct 14, 2016 at 10:45
Instead of $this->attributes['begin'] + 10, could you just do $this->begin + 10? Not sure why that would be a problem, but it's a hunch. Laravel thinks it's getting an eloquent relationship here, see Simon's comment above. — Captain Hypertext
– Captain Hypertext, Commented Oct 14, 2016 at 12:42
Could you show your entire relevant controller code? Nothing wrong with your function or with your call. Sure that the error stack is pointing to this line? — Elias Soares
– Elias Soares, Commented Oct 14, 2016 at 13:57

Jorge Y. C. Rodriguez · Accepted Answer · 2016-10-14 15:29:26Z

1

If the calculation will be performed with the model data, you do not need to use $this->attributes to get the model data, that way it actually makes it a bit more "dirty". the cleanest way it will be as mention in the comments:

public function sumBegin($default = 10)
{
    return $this->begin + $default;
}

that way we take the begin for the current model being called.

answered Oct 14, 2016 at 15:29

Jorge Y. C. Rodriguez

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