编辑时显示下拉列表中的其他表数据

Question

Is that possible to get data from other table?

Let say in create table, I get all the info from genre table and display all data in drop down list

      <select name="mov_genre" id="mov_genre" class="form-control input-sm">
          <option value="">类型</option>
               @foreach(App\Genre::all() as $gData)
          <option value="{{$gData->gen_title}}">{{$gData->gen_title}}</option>
               @endforeach
      </select>

In edit page, I want to display it as well but how to display it as the genre I selected when create?

Answer 1

In my opinion, you should use $gData->id as value of each option. Because normally you store the id as foreign key and not something like the title.

But to your question itself: You can simply add an if statement that checks within the foreach loop if the current item is the selected one. In my example I assume you have a variable $movie which is the entry you want to edit.

  <select name="mov_genre" id="mov_genre" class="form-control input-sm">
      <option value="">-- SELECT GENRE --</option>
      @foreach(App\Genre::pluck('gen_title', 'id') as $key => $value)
          <option value="{{ $key }}" {{ optional($movie)->genre_id === $key ? 'selected' : '' }}>{{ $value }}</option>
      @endforeach
  </select>

Please note that I swapped App\\Genre::all() for App\\Genre::pluck('gen_title', 'id') . This will only load the both fields gen_title and id and put them in an array where id is the key and gen_title the value. It is done for better performance as we do not load unnecessary data.

Also note that optional($movie) will return null when $movie is not set. This is done to reduce weird if statements and is common practice.