The Laravel validation rule does not work: ignoring the check for uniqueness (unique) when updating data. How to fix?

Question

Laravel

When creating the admin section for editing product categories, there were problems with validation when updating data, namely: ignoring the validation rules for the unique value of the slag field when updating data. In the categories

database table , for CNC links, a “slag” field has been created - with a check for uniqueness In the UPDATE method of the resource controller, a number of rules for validation are prescribed, including for checking for the uniqueness of the slag field, ignoring the current value for updating data.
$table->string('slug')->unique();

public function update(Request $request, $id)
    {
        $category = Category::find($id);
        $messages = [
            'name.required' => 'Поле "Наименование категории" обязательно для заполнения',
            'slug.required' => 'Поле "ЧПУ категории" обязательно для заполнения',
            'slug.unique' => 'Данные в поле "ЧПУ категории" должны быть уникальными',
           .....
        ];

        $this->validate($request, [
            'name' => 'required',
            'slug' => 'required|unique:categories,slug,'.$category->slug,
             ....
        ],$messages);

According to the documentation, the validation rule is set:

'slug' => 'required|unique:categories,slug,'.$category->slug
//То есть
//slug' => 'required|unique:таблица,поле,текущее_значение'

But for some reason this does not work, when making changes and trying to save the data, a validation error is triggered, for some reason the current value is not ignored when checking the field for uniqueness.


I ask for help, where to look for an error, where to look?

Answer 1

....
'slug' => 'required|unique:categories,slug,'.$id,
....

Answer 2

Both examples are from the working draft

public function rules()
    {
        return [
            'name' => 'required|string|min:2|max:30',
            'email' => ['required', 'email', Rule::unique('users', 'email')->ignore($this->id)],
            'password' => 'min:8',
            'role' => 'required'
        ];
    }
}

public function rules()
    {
        return [
            'title' => ['required', Rule::unique('vh_nodes', 'title')->ignore($this->id)],
            'url' => 'required',
            'login' => 'required',
            'password' => 'required',
        ];
    }

Answer 3

You don't need to concatenate the value itself to the validation rule.
It is enough to specify the table and the field. You can also omit the indication of the table column if the name of the checked field matches the column
'slug' => 'required|unique:categories,slug'
'slug' => 'required|unique:categories'