Laravel/LaraCSV Managing Complex Relationships - php

Question

I'm running into some issues with my Collection/Model relationships with regards to LaraCSV. Here is its documentation: https://github.com/usmanhalalit/laracsv#full-documentation. I have 3 models that interact right now: Doctor, Patient, Script
Doctor belongsToMany Patient
Patient belongsToMany Doctor
Patient hasMany Script
Script belongsTo Patient
I also created a relationship link inside of my Doctor model that can be used to tie Doctor to Script, but does not appear to work in this instance:
public function scripts() {
$this->load(['patients.scripts' => function($query) use (&$relation) {
$relation = $query;
}]);
return $relation;
}
What I am attempting to do is allow admin staff and our users to download CSV files that contain all of their scripts. While this works fine for admin staff as I can reference the models directly, I am not able to make it work for users because they are tied to the doctors, and I cannot seem to tie this into scripts as normal. Here is a perfectly working version for admin staff:
$doctors = Doctor::orderBy('last_name', 'asc')->get();
$patients = Patient::orderBy('last_name', 'asc')->get();
$scripts = Script::orderBy('prescribe_date', 'desc')->get();
$csvExporter->beforeEach(function ($script) use ($doctors, $patients) {
$patient = $patients->where('id', $script->patient_id)->first();
$doctor = $patient->doctors->first();
$script->patient = $patient->full_name;
$script->doctor = $doctor->full_name;
});
Here is how the user-specific version appears:
$doctors = User::
find(Auth::user()->id)
->doctors()
->orderBy('last_name', 'asc')
->get();
$patients = Patient::orderBy('last_name', 'asc')->get();
$scripts = $doctors->scripts()->get();
Trying to chain in my Doctor model scripts() function results in an error: Method Illuminate\Database\Eloquent\Collection::scripts does not exist.
$doctors = User::
find(Auth::user()->id)
->doctors()
->orderBy('last_name', 'asc')
->get();
$patients = array();
$scripts = array();
foreach ($doctors as $doctor_fe) {
foreach ($doctor_fe->patients as $patient_fe) {
$patients[] = $patient_fe;
foreach ($patient_fe->scripts as $script_fe) {
$scripts[] = $script_fe;
}
}
}
I also tried to pull the information using arrays, but unfortunately, it must be a Collection passed in via this error: Argument 1 passed to Laracsv\Export::addCsvRows() must be an instance of Illuminate\Database\Eloquent\Collection, array given

Answer 1

I settled by placing all of the patients belonging to the user's doctors through a foreach loop, then using another one to grab the patient's id. I then took the patient's id array and used the whereIn function to compare the Script's patient_id field to get the correct strips.
$doctors = User::
find(Auth::user()->id)
->doctors()
->orderBy('last_name', 'asc')
->get();
$patients_array = array();
foreach ($doctors as $doctor_fe) {
$patients_fe = $doctor_fe->patients;
foreach ($patients_fe as $patient_fe) {
$patients_array[] = $patient_fe->id;
}
}
$patients = Patient::orderBy('last_name', 'asc')->get();
$scripts = Script::whereIn('patient_id', $patients_array)->get();
$csvExporter->beforeEach(function ($script) use ($doctors, $patients) {
$patient = $patients->where('id', $script->patient_id)->first();
$patient_initials = substr($patient->first_name, 0, 1) . substr($patient->last_name, 0, 1);
$doctor = $patient->doctors->first();
$script->patient = $patient_initials;
$script->doctor = $doctor->full_name;
});

Answer 2

If I interpret you question correctly, you want to get all scripts of all patients of a doctor. Laravel provides the hasManyThrough() Method for this:
class Doctor extends Model
{
/**
* Get all of the scripts for the patient.
*/
public function scripts()
{
return $this->hasManyThrough(App\Script::class, App\Patient::class);
}
}
The first param is the model you want to get (the scripts); the 2nd param is the intermediate model (the patient).
To use it:
$doctor = Doctor::first();
$scripts = $doctor->scripts;