Property [associated_occupation] does not exist on this collection instance. - Laravel - php

Question

I would like to store a database value into the variable. For some reason It's not working as expected. Below is the code in controller:
public function show(Word $word)
{
//
$curriculum = Curriculum::findOrFail($word->id);
// dd($curriculum->id);
session(['key' => $curriculum->id]);
$knowledge = Knowledge::where('curriculum_id','=', $word->id)->get();
$information = Information::where('curriculum_id','=', $word->id)->get();
$practical = Practical::where('curriculum_id','=',$word->id)->get();
$work = Work::where('curriculum_id','=',$word->id)->get();
$entry = Entry::where('curriculum_id','=',$word->id)->get();
$assessment = Assessment::where('curriculum_id','=',$word->id)->get();
$parts = Part::where('curriculum_id','=',$word->id)->get();
$occupurpose = Occupurpose::where('curriculum_id','=',$word->id)->get();
$occutask = Occutask::where('curriculum_id','=',$word->id)->get();
$taskdetail = Taskdetail::where('curriculum_id','=',$word->id)->get();
$purposekm = Purposekm::where('curriculum_id','=',$word->id)->get();
$guidedtopic = Guidetopic::where('curriculum_id','=',$word->id)->get();
$purposepms = Purposepm::where('curriculum_id','=',$word->id)->get();
$purposewem = Purposewem::where('curriculum_id','=',$word->id)->get();
$guidedpmstopics = Guidedpmstopic::where('curriculum_id','=',$word->id)->get();
$guidedwemstopics = Guidedwemstopic::where('curriculum_id','=',$word->id)->get();
$wordTest = new \PhpOffice\PhpWord\PhpWord();
$newSection = $wordTest->addSection();
$SectionHeading = "SECTION 1: CURRICULUM SUMMARY";
$newSection->addText($SectionHeading);
$topicHeading = "1. Occupational Information";
$newSection->addText($topicHeading);
$subTopic = "1.1 Associated Occupation";
$newSection->addText($subTopic);
$newSection->addText($knowledge->associated_occupation);
$occupationTopic = "1.2 Occupation or Specialisation Addressed by this Curriculum";
$newSection->addText($occupationTopic);
$newSection->addText($knowledge->specialisation);
$alternativeTopic = "1.3 Alternative Titles used by Industry";
$newSection->addText($alternativeTopic);
$newSection->addText($knowledge->alternative_title);
$objectWriter = \PhpOffice\PhpWord\IOFactory::createWriter($wordTest,'Word2007');
try {
$objectWriter->save(storage_path('TestWordFile.docx'));
} catch(Exception $e) {
}
return response()->download(storage_path('TestWordFile.docx'));
}
When I do dd of the curriculum id and the knowledge result I get correct feedback. Now I would like to store the column
associated_occupation
into the variable called newSection but I get the error mentioned on the subject. I also tried
$newSection->addText($knowledge->select('associated_occupation')); instead of $newSection->addText($knowledge->associated_occupation);
Please assist.

Answer 1

You are trying to access a property of a collection:
$knowledge = Knowledge::where('curriculum_id','=', $word->id)->get();
The above will give you a collection of results that have the curriculum_id as $word->id
https://laravel.com/docs/5.6/queries#retrieving-results
The get method returns an Illuminate\Support\Collection containing the results where each result is an instance of the PHP StdClass object.
So when you do:
$newSection->addText($knowledge->associated_occupation);
The $knowledge->associated_occupation is looking for associated_occupation on a collection of results rather than a specific Knowledge
Change your query to:
$knowledge = Knowledge::where('curriculum_id','=', $word->id)->first();
To get the first Knowledge that has it's curriculum_id as $word->id
https://laravel.com/docs/5.6/queries#retrieving-results
If you just need to retrieve a single row from the database table, you
may use the first method. This method will return a single StdClass
object:
Or filter the collection and pick a specific one