dongzang7182 2018-06-02 19:54
浏览 44
已采纳

返回数据透视表数据以在Laravel中查看

I'm not quite sure what it is I'm doing wrong...

I've got a recipe project that I'm learning with, but I can't seem to get the data joined by a pivot table into the view.

The user creates a recipe [at (name, description, portions, tags etc), and is then directed to the "create ingredients" view. From here they are adding ingredients via an Ajax request, which is successfully saving to the ingredients table, and the link in recipe_ingredients.

I'm dynamically adding the ingredients to the table via ajax, but when the user refreshes the page, I need it to loop through the ingredients table, and return just those associated with the given recipe.

I'm using the following loop, but it isn't working:

@foreach($recipe->ingredients as $ingredient)
  {{$recipe->ingredient->name}}
@endforeach

And I'm getting the following error:

ErrorException (E_ERROR):
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'ingredients.recipe_ingredients' in 'where clause' (SQL: select * from `ingredients` where `ingredients`.`recipe_ingredients` is null and `ingredients`.`recipe_ingredients` is not null) (View: C:\xampp\htdocs\sitesecipesesources\views\ingredients\create.blade.php)

INFO:

I've got 3 tables: recipes, ingredients, recipe_ingredients

Recipe Model:

class Recipe extends Model
{
  public function ingredients(){
    return $this->hasMany('App\Ingredient', 'recipe_ingredients', 'recipe_id', 'ingredient_id');
  }

Ingredients Model:

class Ingredient extends Model
{
    public function recipes(){
    return $this->belongsToMany('App\Recipe', 'recipe_ingredients', 'ingredient_id', 'recipe_id');
}

Ingredients Controller

public function create($recipe_id)
{
  $recipe = Recipe::find($recipe_id);
  return view('ingredients.create')->withRecipe($recipe);
}

public function store(Request $request)
{

  $this->validate($request, [
    'name' => 'required|max:255'
  ]);

  $ingredient = new Ingredient;
  $ingredient->name = $request->name;
  $ingredient->save();

  $recipe = Recipe::find($request->id);
  $ingredient->recipes()->attach($recipe->id);

  $data = [
    'success' => true,
    'message'=> 'Your AJAX processed correctly',
    'name' => $ingredient->name,
    'recipe' => $recipe,
  ] ;

    return response()->json($data);
}

Ajax Script for saving ingredients to db:

<script>
$(document).ready(function(){
  $("#submit").click(function() {
    var name = $("#ingredientName").val();
    var token = $("#token").val();

    $.ajax({
      headers: {
        'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
        },
      type: "post",
      data: "name="+name,
      dataType:'json',
      url: "{{ route('ingredients.store', ['id' => $recipe->id]) }}",
      success:function(data){
        console.log(data);
        $("#msg").html('<div class="alert alert-success my-0">'+data.name+' added</div>');
        $("#msg").toggleClass("invisible")
        $("#msg").fadeOut(2000);
        $("#ingredientsTable").append('<tr><td scope="col" class="align-middle">'+data.name+'</td></tr>');
      }
    });
  })
})
</script>

Relevant part of the view:

<div class="row">
  <div class="col-lg-3">
    <div class="card">
      <div class="card-body">
        <!-- 
        <p><b>Est. prep time:</b></p>
        <p><b>Est. cooking time:</b></p>
        -->
        <p><b>Portions:</b> {{ $recipe->portions }}</p>
        <p><b>Creator:</b> <a href="#">{{ $recipe->user->name }}</a></p>
        @if($recipe->created_at == $recipe->updated_at) 
          <p><b>Created:</b> {{ $recipe->created_at->diffForHumans() }}</p>
        @else
          <p><b>Updated:</b> {{ $recipe->updated_at->diffForHumans() }}</p>
        @endif
        <!-- 
        <p><b>Rating:</b> <i class="fas fa-star"></i><i class="fas fa-star"></i><i class="fas fa-star"></i><i class="fas fa-star"></i><i class="fas fa-star-half"></i>&nbsp;(52)</p>
        -->

        <div id="tags">
          @foreach($recipe->tags as $tag)
            <button type="button" class="btn btn-outline-{{$tag->colour}} btn-sm my-1">{{$tag->name}}</button>
          @endforeach
        </div>

      </div>
    </div>
  </div>

  <div class="col-lg-9">
    <table class="table table-hover table-light" style="border: 1px solid rgba(0,0,0,.125);">
      <thead>
        <tr>
          <th scope="col">Ingredients:</th>
        </tr>
      </thead>
      <tbody id="ingredientsTable">

        @foreach($recipe->ingredients as $ingredient)
        {{$recipe->ingredient->name}}
        @endforeach
      </tbody>
    </table>
  </div>
</div>

Routes:

$ php artisan route:list
+--------+-----------+--------------------------+--------------------+------------------------------------------------------------------------+--------------+
| Domain | Method    | URI                      | Name               | Action                                                                 | Middleware   |
+--------+-----------+--------------------------+--------------------+------------------------------------------------------------------------+--------------+
|        | GET|HEAD  | /                        |                    | App\Http\Controllers\PagesController@index                             | web          |
|        | GET|HEAD  | api/user                 |                    | Closure                                                                | api,auth:api |
|        | GET|HEAD  | home                     | home               | App\Http\Controllers\HomeController@index                              | web,auth     |
|        | GET|HEAD  | login                    | login              | App\Http\Controllers\Auth\LoginController@showLoginForm                | web,guest    |
|        | POST      | login                    |                    | App\Http\Controllers\Auth\LoginController@login                        | web,guest    |
|        | POST      | logout                   | logout             | App\Http\Controllers\Auth\LoginController@logout                       | web          |
|        | POST      | password/email           | password.email     | App\Http\Controllers\Auth\ForgotPasswordController@sendResetLinkEmail  | web,guest    |
|        | GET|HEAD  | password/reset           | password.request   | App\Http\Controllers\Auth\ForgotPasswordController@showLinkRequestForm | web,guest    |
|        | POST      | password/reset           |                    | App\Http\Controllers\Auth\ResetPasswordController@reset                | web,guest    |
|        | GET|HEAD  | password/reset/{token}   | password.reset     | App\Http\Controllers\Auth\ResetPasswordController@showResetForm        | web,guest    |
|        | POST      | recipes                  | recipes.store      | App\Http\Controllers\RecipesController@store                           | web,auth     |
|        | GET|HEAD  | recipes                  | recipes.index      | App\Http\Controllers\RecipesController@index                           | web,auth     |
|        | GET|HEAD  | recipes/create           | recipes.create     | App\Http\Controllers\RecipesController@create                          | web,auth     |
|        | GET|HEAD  | recipes/{id}/ingredients | ingredients.create | App\Http\Controllers\IngredientsController@create                      | web,auth     |
|        | POST      | recipes/{id}/ingredients | ingredients.store  | App\Http\Controllers\IngredientsController@store                       | web,auth     |
|        | GET|HEAD  | recipes/{recipe}         | recipes.show       | App\Http\Controllers\RecipesController@show                            | web,auth     |
|        | DELETE    | recipes/{recipe}         | recipes.destroy    | App\Http\Controllers\RecipesController@destroy                         | web,auth     |
|        | PUT|PATCH | recipes/{recipe}         | recipes.update     | App\Http\Controllers\RecipesController@update                          | web,auth     |
|        | GET|HEAD  | recipes/{recipe}/edit    | recipes.edit       | App\Http\Controllers\RecipesController@edit                            | web,auth     |
|        | POST      | register                 |                    | App\Http\Controllers\Auth\RegisterController@register                  | web,guest    |
|        | GET|HEAD  | register                 | register           | App\Http\Controllers\Auth\RegisterController@showRegistrationForm      | web,guest    |
|        | POST      | steps                    | steps.store        | App\Http\Controllers\StepsController@store                             | web,auth     |
|        | GET|HEAD  | steps                    | steps.index        | App\Http\Controllers\StepsController@index                             | web,auth     |
|        | GET|HEAD  | steps/create             | steps.create       | App\Http\Controllers\StepsController@create                            | web,auth     |
|        | GET|HEAD  | steps/{step}             | steps.show         | App\Http\Controllers\StepsController@show                              | web,auth     |

Migrations:

create_recipes_table

Schema::create('recipes', function (Blueprint $table) {
  $table->increments('id');
  $table->string('name');
  $table->text('description');
  $table->integer('portions');
  $table->integer('user_id');
  $table->timestamps();
});

create_ingredients_table

Schema::create('ingredients', function (Blueprint $table) {
    $table->increments('id');
    $table->text('name');
    $table->boolean('approved')->nullable();
    $table->datetime('approved_at')->nullable();
    $table->integer('approved_by')->nullable();
    $table->timestamps();
});

create_recipe_ingredients_table

Schema::create('recipe_ingredients', function (Blueprint $table) {
    $table->integer('recipe_id')->unsigned();
    $table->foreign('recipe_id')->references('id')->on('recipes');

    $table->integer('ingredient_id')->unsigned();
    $table->foreign('ingredient_id')->references('id')->on('ingredients');
});
  • 写回答

1条回答 默认 最新

  • duanquanhan2333 2018-06-02 20:06
    关注

    You get this error because your relationship on your Recipe model is not correct. Since the relationship between recipes and igredients is many-to-many, both models need to have belongsToMany relationship to the other model:

    class Recipe extends Model
    {
        public function ingredients(){
            return $this->belongsToMany('App\Ingredient', 'recipe_ingredients');
        }
    }
    

    There's also an error in your foreach, you should reference the $ingredient from the loop:

    @foreach($recipe->ingredients as $ingredient)
      {{ $ingredient->name }}
    @endforeach
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

报告相同问题?

悬赏问题

  • ¥20 docker里部署springboot项目,访问不到扬声器
  • ¥15 netty整合springboot之后自动重连失效
  • ¥15 悬赏!微信开发者工具报错,求帮改
  • ¥20 wireshark抓不到vlan
  • ¥20 关于#stm32#的问题:需要指导自动酸碱滴定仪的原理图程序代码及仿真
  • ¥20 设计一款异域新娘的视频相亲软件需要哪些技术支持
  • ¥15 stata安慰剂检验作图但是真实值不出现在图上
  • ¥15 c程序不知道为什么得不到结果
  • ¥40 复杂的限制性的商函数处理
  • ¥15 程序不包含适用于入口点的静态Main方法