json - Laravel 5.1 Eloquent collection not returning correct results -

i have eloquent collection {{ $questions }}, when output inside blade template following results:

[{"question_num":0,"survey_id":2,"question_text":"test","expected_answer":1},   {"question_num":1,"survey_id":2,"question_text":"test","expected_answer":1}]  

as can see there 2 objects. when apply filter {{ $questions->where('question_num','=', 0) }}, following results correct:

[{"question_num":0,"survey_id":2,"question_text":"test","expected_answer":1}]  

but when apply following filter {{ $questions->where('question_num','=', 1) }}, empty result, why that, when collection has question_num value of 1?

[] 

i've been scratching head day this!

the problem here use operator, here collection signature where method is:

where( string $key, mixed $value, bool $strict = true) 

so in both cases, should use:

{{ $questions->where('question_num', 0) }} 

and

{{ $questions->where('question_num', 1) }} 

to result expect