How to merge two forms (Create and Update) into one?

Question

Laravel

I have two forms: create and edit post. I'm trying to combine them into one, how to do it right? I succeeded with assigning a variable in the controller for each method, and in the view I just checked which method was called. And what about checking the content - if there is a record, the Edit method is called, if there is no record, then Create?

controller:

public function create() {
        return view('admin.categories.create');
    }

    public function edit($id) {
        $cat = Category::find($id);
        return view('admin.categories.create', compact('cat'));
    }

Representation:

<form action="{{ ($cat->title > 0 ? route('category.store') : route('category.update', ['id'=>$cat->id])) }}" method="post" enctype="multipart/form-data">
                        @csrf
                        @if ($cat->title > 0)
                            @method('PATCH')
                        @endif
                        <div class="form-group">
                            <label for="cat_id">Категория</label>
                            {{$cat->tite ?? ''}}
                        </div>
                        <div class="form-group">
                            <input name="category[title]" type="text" class="form-control"  required value="{{ $cat->title ?? ''}}">
                        </div>
                        <input type="submit" value="Создать" class="btn btn-outline-success">
                    </form>

There is an error in this implementation, because At the Create method, I do not pass variables and it swears that they do not exist.

Answer 1

Here is my implementation

<form action="{{ (empty($cats) ? route('category.store') : route('category.update', ['id'=>$cats->id])) }}" method="post" enctype="multipart/form-data">
                        @csrf
                        @if (isset($cats))
                            @method('PATCH')
                        @endif
                        <div class="form-group">
                            <label for="cat_id">Категория</label>
                            {{$cats->tite ?? ''}}
                        </div>
                        <div class="form-group">
                            <input name="category[title]" type="text" class="form-control"  required value="{{ $cats->title ?? ''}}">
                        </div>
                        <input type="submit" value="Создать" class="btn btn-outline-success">
                    </form>

Answer 2

1) Create a normal resource controller, with normal methods, routes and Model Binding
2) Save create edit views. It is strange to give a create view to the edit action
3) Move the form to include . Remove from it all these unnecessary checks.
4) Pass necessary routes and texts to include from create edit views

Answer 3

I usually have 1 method for both actions.
I just pass an empty model to the view, and "0" as the URL parameter.

public function edit($id) {
        $cat = Category::findOrNew($id);
        return view('admin.categories.edit', compact('cat'));
    }

Answer 4

The error is that you are trying to get a value from a non-existent object ($cat->title > 0)
As an option, I think it’s more logical to use different files for the form wrapper, but put everything inside the forms into a separate view. This will eliminate confusion.
In current code

value="{{ $cats->title ?? ''}}"

will reset values ​​after incorrect form validation and will need to be filled out again. would be more logical

old('title', $cats->title ?? '')