Laravel : Different json output for the same query

I have a laravel application where the route "/phones/brand/{brand_id}" returns all the phones associated with that brand. This works perfectly except with brands other than brand_id 1, the output is different.

/phones/brand/1 result

[{"id":1,"phone_model_id":1,"model":"Iphone 5"},
{"id":2,"phone_model_id":1,"model":"Iphone 5s"},
{"id":3,"phone_model_id":1,"model":"Iphone 6"}]

/phones/brand/2 result

{"3":{"id":6,"phone_model_id":2,"model":"galaxyy s3"}}

I am unable to work with this data as it returns empty slots in javascript.

Console log:

Object [ <3 empty slots>, Object ]  script.js:84:11

Here is also the code for the controller action for that endpoint.

public function showByBrand($brand)
{

return Phone::all()->where('phone_model_id', '=', $brand);

}

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