Struckle with my model and the builder - "Call to a member function get() on null"

Your redefining the database db and builder in your models constructor, the model already has the builder.
just use this->builder where needed. These are already set in the model.

You do not have to tell the builder the model name its in your variables.

PHP Code:

<?php

namespace App\Models;

use CodeIgniter\Model;

class EpocheModel extends Model {

    protected $table         = 'epoche'; // your table is auto set here and sent to the model
    protected $primaryKey    = 'id';
    protected $returnType    = 'object';
    protected $allowedFields = ['id', 'name', 'description', 'time_begin', 'time_end', 'source'];

    public function __construct()
    {
    parent::__construct();
    }

    public function add($data)
    {
        $query = [
            'parent_id'     => 0,
            'name'          => $data->getVar('label'),
            'description'   => $data->getVar('description'),
            'time_begin'    => $data->getVar('begin'),
            'time_end'      => $data->getVar('end'),
            'source'        => $data->getVar('source')
        ];

        return $this->insert($query);

    }

    public function getAll()
    {
        return $this->builder->get();

    }

} 


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