Manipulating data within an object











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1
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Hi I am new to Laravel and php. In my database each student has three marks on each subject and I need to retrieve them and send to the view the average mark for each student.
I tried doing it like below, but the returned value is an object (e.g. [5,4,3]) and it doesn't let me count the average. Please advise how I can operate with data within the object.



$students = Student::all();



foreach ($students as $student) {

    $mathPoints = Point:: where('subject_id', 1)

        ->where('student_id', $student->id)

        ->pluck('points');

}


I tried turning it into an array by (array) method, but I couldn't calculate the sum of values with array_sum after.



Update: my Point model:



namespace AppModels;



use IlluminateDatabaseEloquentModel;



class Point extends Model

{

    //Get the student the credit points are related to

    public function student()

    {

        return $this->belongsTo('App/Models/Student');

    }

    //Get the subject the credit points are related to

    public function subject()

    {

        return $this->belongsTo('App/Models/Subject');

    }

}





php laravel-5







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  • can you please post your Point model?
    – JoseLinares
    9 hours ago










  • @LiMi add that to the question
    – Yash Karanke
    9 hours ago










  • @YashKaranke added
    – LiMi
    9 hours ago










  • Probably not part of the solution, but you have an errant space in Point:: where
    – Adam Hopkinson
    9 hours ago















up vote
1
down vote

favorite












Hi I am new to Laravel and php. In my database each student has three marks on each subject and I need to retrieve them and send to the view the average mark for each student.
I tried doing it like below, but the returned value is an object (e.g. [5,4,3]) and it doesn't let me count the average. Please advise how I can operate with data within the object.



$students = Student::all();



foreach ($students as $student) {

    $mathPoints = Point:: where('subject_id', 1)

        ->where('student_id', $student->id)

        ->pluck('points');

}


I tried turning it into an array by (array) method, but I couldn't calculate the sum of values with array_sum after.



Update: my Point model:



namespace AppModels;



use IlluminateDatabaseEloquentModel;



class Point extends Model

{

    //Get the student the credit points are related to

    public function student()

    {

        return $this->belongsTo('App/Models/Student');

    }

    //Get the subject the credit points are related to

    public function subject()

    {

        return $this->belongsTo('App/Models/Subject');

    }

}





php laravel-5







share|improve this question









New contributor




LiMi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




















  • can you please post your Point model?
    – JoseLinares
    9 hours ago










  • @LiMi add that to the question
    – Yash Karanke
    9 hours ago










  • @YashKaranke added
    – LiMi
    9 hours ago










  • Probably not part of the solution, but you have an errant space in Point:: where
    – Adam Hopkinson
    9 hours ago













up vote
1
down vote

favorite









up vote
1
down vote

favorite











Hi I am new to Laravel and php. In my database each student has three marks on each subject and I need to retrieve them and send to the view the average mark for each student.
I tried doing it like below, but the returned value is an object (e.g. [5,4,3]) and it doesn't let me count the average. Please advise how I can operate with data within the object.



$students = Student::all();



foreach ($students as $student) {

    $mathPoints = Point:: where('subject_id', 1)

        ->where('student_id', $student->id)

        ->pluck('points');

}


I tried turning it into an array by (array) method, but I couldn't calculate the sum of values with array_sum after.



Update: my Point model:



namespace AppModels;



use IlluminateDatabaseEloquentModel;



class Point extends Model

{

    //Get the student the credit points are related to

    public function student()

    {

        return $this->belongsTo('App/Models/Student');

    }

    //Get the subject the credit points are related to

    public function subject()

    {

        return $this->belongsTo('App/Models/Subject');

    }

}





php laravel-5







share|improve this question









New contributor




LiMi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











Hi I am new to Laravel and php. In my database each student has three marks on each subject and I need to retrieve them and send to the view the average mark for each student.
I tried doing it like below, but the returned value is an object (e.g. [5,4,3]) and it doesn't let me count the average. Please advise how I can operate with data within the object.



$students = Student::all();



foreach ($students as $student) {

    $mathPoints = Point:: where('subject_id', 1)

        ->where('student_id', $student->id)

        ->pluck('points');

}


I tried turning it into an array by (array) method, but I couldn't calculate the sum of values with array_sum after.



Update: my Point model:



namespace AppModels;



use IlluminateDatabaseEloquentModel;



class Point extends Model

{

    //Get the student the credit points are related to

    public function student()

    {

        return $this->belongsTo('App/Models/Student');

    }

    //Get the subject the credit points are related to

    public function subject()

    {

        return $this->belongsTo('App/Models/Subject');

    }

}





php laravel-5




php laravel-5






share|improve this question









New contributor




LiMi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




LiMi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 8 hours ago









zedling

448220




448220






New contributor




LiMi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 9 hours ago









LiMi

83




83




New contributor




LiMi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





LiMi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






LiMi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • can you please post your Point model?
    – JoseLinares
    9 hours ago










  • @LiMi add that to the question
    – Yash Karanke
    9 hours ago










  • @YashKaranke added
    – LiMi
    9 hours ago










  • Probably not part of the solution, but you have an errant space in Point:: where
    – Adam Hopkinson
    9 hours ago


















  • can you please post your Point model?
    – JoseLinares
    9 hours ago










  • @LiMi add that to the question
    – Yash Karanke
    9 hours ago










  • @YashKaranke added
    – LiMi
    9 hours ago










  • Probably not part of the solution, but you have an errant space in Point:: where
    – Adam Hopkinson
    9 hours ago
















can you please post your Point model?
– JoseLinares
9 hours ago




can you please post your Point model?
– JoseLinares
9 hours ago












@LiMi add that to the question
– Yash Karanke
9 hours ago




@LiMi add that to the question
– Yash Karanke
9 hours ago












@YashKaranke added
– LiMi
9 hours ago




@YashKaranke added
– LiMi
9 hours ago












Probably not part of the solution, but you have an errant space in Point:: where
– Adam Hopkinson
9 hours ago




Probably not part of the solution, but you have an errant space in Point:: where
– Adam Hopkinson
9 hours ago












2 Answers
2






active

oldest

votes

















up vote
1
down vote



accepted










use Model::avg('columnName') to calculate average .



read more here : https://laravel.com/docs/5.4/queries#aggregates



$students = Student::all();

foreach ($students as $student){

   $mathPoints = Point::where(['subject_id'=>1,'student_id'=>$student->id])->avg('points');

   $student->avgPoint=$mathPoints;

}


inside your blade : 



{{ $student->avgPoint}}





share|improve this answer






























    up vote
    2
    down vote













    Point::where('student_id', $student->id)->get()


    When you use all() with Eloquent, it makes the query for you. If you use where(), you have to ‘get’ it using get() before you can use it as a collection.



    $mathPoints = Point::where('student_id', $student->id)
    
    ->get()
    
    ->pluck('points');


    However, I’d probably look at using more complicated queries to fetch this data, as you could easily end up making hundreds of queries per page, rather than just 1.






    share|improve this answer





















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      2 Answers
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      2 Answers
      2






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      active

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      up vote
      1
      down vote



      accepted










      use Model::avg('columnName') to calculate average .



      read more here : https://laravel.com/docs/5.4/queries#aggregates



      $students = Student::all();
      
foreach ($students as $student){
      
   $mathPoints = Point::where(['subject_id'=>1,'student_id'=>$student->id])->avg('points');
      
   $student->avgPoint=$mathPoints;
      
}


      inside your blade : 



      {{ $student->avgPoint}}





      share|improve this answer



























        up vote
        1
        down vote



        accepted










        use Model::avg('columnName') to calculate average .



        read more here : https://laravel.com/docs/5.4/queries#aggregates



        $students = Student::all();
        
foreach ($students as $student){
        
   $mathPoints = Point::where(['subject_id'=>1,'student_id'=>$student->id])->avg('points');
        
   $student->avgPoint=$mathPoints;
        
}


        inside your blade : 



        {{ $student->avgPoint}}





        share|improve this answer

























          up vote
          1
          down vote



          accepted







          up vote
          1
          down vote



          accepted






          use Model::avg('columnName') to calculate average .



          read more here : https://laravel.com/docs/5.4/queries#aggregates



          $students = Student::all();
          
foreach ($students as $student){
          
   $mathPoints = Point::where(['subject_id'=>1,'student_id'=>$student->id])->avg('points');
          
   $student->avgPoint=$mathPoints;
          
}


          inside your blade : 



          {{ $student->avgPoint}}





          share|improve this answer














          use Model::avg('columnName') to calculate average .



          read more here : https://laravel.com/docs/5.4/queries#aggregates



          $students = Student::all();
          
foreach ($students as $student){
          
   $mathPoints = Point::where(['subject_id'=>1,'student_id'=>$student->id])->avg('points');
          
   $student->avgPoint=$mathPoints;
          
}


          inside your blade : 



          {{ $student->avgPoint}}






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 8 hours ago

























          answered 8 hours ago









          Saurabh Mistry

          2,6691726




          2,6691726
























              up vote
              2
              down vote













              Point::where('student_id', $student->id)->get()


              When you use all() with Eloquent, it makes the query for you. If you use where(), you have to ‘get’ it using get() before you can use it as a collection.



              $mathPoints = Point::where('student_id', $student->id)
              
    ->get()
              
    ->pluck('points');


              However, I’d probably look at using more complicated queries to fetch this data, as you could easily end up making hundreds of queries per page, rather than just 1.






              share|improve this answer

























                up vote
                2
                down vote













                Point::where('student_id', $student->id)->get()


                When you use all() with Eloquent, it makes the query for you. If you use where(), you have to ‘get’ it using get() before you can use it as a collection.



                $mathPoints = Point::where('student_id', $student->id)
                
    ->get()
                
    ->pluck('points');


                However, I’d probably look at using more complicated queries to fetch this data, as you could easily end up making hundreds of queries per page, rather than just 1.






                share|improve this answer























                  up vote
                  2
                  down vote










                  up vote
                  2
                  down vote









                  Point::where('student_id', $student->id)->get()


                  When you use all() with Eloquent, it makes the query for you. If you use where(), you have to ‘get’ it using get() before you can use it as a collection.



                  $mathPoints = Point::where('student_id', $student->id)
                  
    ->get()
                  
    ->pluck('points');


                  However, I’d probably look at using more complicated queries to fetch this data, as you could easily end up making hundreds of queries per page, rather than just 1.






                  share|improve this answer












                  Point::where('student_id', $student->id)->get()


                  When you use all() with Eloquent, it makes the query for you. If you use where(), you have to ‘get’ it using get() before you can use it as a collection.



                  $mathPoints = Point::where('student_id', $student->id)
                  
    ->get()
                  
    ->pluck('points');


                  However, I’d probably look at using more complicated queries to fetch this data, as you could easily end up making hundreds of queries per page, rather than just 1.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 9 hours ago









                  Thomas Edwards

                  7,09031332




                  7,09031332






















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