Question

发送补丁请求时，我无法更新嵌套属性。我想在更新食谱时更新我的recipe_ingredients。每当我更新我的食谱时，食谱都会更新，但recipe_ingredients只是为该食谱添加。请帮忙〜非常感谢〜

配方控制器

```

  def update
    @recipe = Recipe.find(params[:id])
    if @recipe.update(recipe_params)
       @recipe_ingredients = @recipe.recipe_ingredients.all
       head :no_content
    else
       render json: @recipe.errors, status: :unprocessable_entity
    end
  end

  def recipe_params
  params.require(:recipes)
        .permit(:name, :category, instructions: [],  recipe_ingredients_attributes: [:id, :recipe_id, :ingredient, :measure, :amount])
end

```

食谱模型：

```

class Recipe < ActiveRecord::Base
   has_many :recipe_ingredients, dependent: :destroy
   accepts_nested_attributes_for :recipe_ingredients, allow_destroy: true, update_only: true
end

```

卷曲请求： ```

   curl --include --request PATCH http://localhost:3000/recipes/1 \
   --header "Authorization: Token token=..." \
   --header "Content-Type: application/json" \
   --data '{
      "recipes": {
      "name": "second example recipe",
      "category": "grill",
      "instructions": ["do it", "ignore it"],
      "recipe_ingredients_attributes": [{
                                         "amount": 1,
                                         "ingredient": "egg yolk",
                                         "measure": "cup"
                                        },
                                        {
                                         "amount": 3,
                                         "ingredient": "soy milk",
                                         "measure": "cup"
                                        }]
      }
    }'

```

Answer 1

您需要在curl curl请求中发送id recipe_ingredients来更新正确的现有recipe_ingredient记录。否则，rails将创建一个新记录。例如，这将使用recipe_ingredient更新id 1并创建新的“豆浆”成分：

"recipe_ingredients_attributes": [{ "id": 1 "amount": 1, "ingredient": "egg yolk", "measure": "cup" }, { "amount": 3, "ingredient": "soy milk", "measure": "cup" }]

更新rails中的嵌套属性

1 个答案: