Can't get laravel's polymorphic relationship to work

I'm trying to get a polymorphic relationship working on laravel but every test I make returns either null or ax exception on laravel's pretended SQL query...

FYI: My laravel version is 5.8 running on a MySQLserver 5.7 (WAMP package)

According to what I read on laravel's docs, I think I must use morphTo() in the polymorphic model's class and morphMany() on it's children tables, as below:

My database is:

companies migration

Schema::create($this->tableName, function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->softDeletes();
...

bank_accounts migration

Schema::create('bank_accounts', function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->bigInteger('bank_id')->unsigned()->nullable();
    $table->bigInteger('currency_id')->unsigned();
    $table->string('name', 50);

    $table->index(["bank_id"], 'fk_credit_cards_banks1_idx');
    $table->index(["currency_id"], 'fk_credit_cards_currencies1_idx');

    $table->foreign('bank_id', 'fk_credit_cards_banks1_idx')
          ->references('id')->on('banks')
          ->onDelete('no action')
          ->onUpdate('no action');

    $table->foreign('currency_id', 'fk_credit_cards_currencies1_idx')
          ->references('id')->on('currencies')
          ->onDelete('no action')
          ->onUpdate('no action');

    $table->timestamps();
    $table->softDeletes();
});

company_has_accounts migration

Schema::create('company_has_accounts', function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->bigInteger('company_id')->unsigned();
    $table->morphs('accountable');
    $table->timestamps();
    $table->softDeletes();

    $table->index(["company_id"], 'fk_company_has_accounts_accounts1_idx');

    $table->foreign('company_id', 'fk_company_has_accounts_accounts1_idx')
          ->references('id')->on('currencies')
          ->onDelete('no action')
          ->onUpdate('no action');
});

and the models:

App\Models\Company

public function accounts(){
    return $this->morphMany(Accountable::class, 'accountable');
}

App\Models\Account\Accountable

public function company()
{
    return $this->belongsTo(Company::class);
}

public function accountable()
{
    return $this->morphTo();
}

Errors:

when I try to debug:

BankAccount::find(1)->company

I keep getting:

Illuminate/Database/QueryException with message 'SQLSTATE[42S22]: Column not found: 1054 Unknown column 'company_has_accounts.company_type' in 'where clause' (SQL: select * from `company_has_accounts` where `company_has_accounts`.`c
ompany_id` = 1 and `company_has_accounts`.`company_id` is not null and `company_has_accounts`.`company_type` = Financeiro/Models/Account/BankAccount and `company_has_accounts`.`deleted_at` is null)'

and when I try to debug:

Company::find(1)->accounts

I keep getting:

Illuminate\Database\Eloquent\Collection {#3324
    all: [],
}

My objectives are:

App\Models\Account\BankAccount

public function company(){
    //To return a App\Models\Company Object
}

App\Models\Account\Company

public function accounts(){
    //To return a collection of mixed "App\Models\Account\BankAccount" and "App\Models\Account\CreditCard" Objects, all belonging to the current App\Models\Account\Company Model, as filtered by the "company_id" column on "company_has_accounts" table
}

I already ran all migrations and there's data in all the tables ('companies', 'bank_accounts' and 'company_has_accounts'. I have already double checked and the 'accountable_type' column got the string 'App\Models\Account\BankAccount' in all rows). My intention is to get BankAccounts to work so I can make more children to the 'Accounts' namespace, like 'CreditCard' or 'Cash'.

via Chebli Mohamed