更新rails中的嵌套属性 [英] Update nested attributes in rails

问题描述

我在传送修补请求时，无法更新巢状属性。我想更新我的recipe_ingredients当我更新我的食谱。每次当我更新我的食谱，食谱获得更新，但recipe_ingredients只是附加的那个食谱。请帮助〜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 
  
 
 
 
```
 
 
 
配方模型：
 
 
 
```
  has_many：recipe_ingredients，dependent：：destroy 
 accepts_nested_attributes_for：recipe_ingredients，allow_destroy：true，update_only：true 
 end 
  
```
 
 
 
 Curl请求：
```
  curl --include --request PATCH http：// localhost：3000 / recipes / 1 \ 
 --header授权：令牌令牌= ...\ 
 --headerContent-Type：application / json\ 
 --data'{
recipes：{
name ：second it recipe，
category：grill，
instructions：[do it，ignore it]，
recipe_ingredients_attributes：[{
amount：1，
ingredient：egg yolk，
measure：cup
}，
 {
amount ：3，
ingredient：豆浆，
measure：杯
}] 
} 
}'
  
```
解决方案
 p>您需要在curl请求中的 recipe_ingredients 中发送 id 以更新正确的现有 recipe_ingred 记录。否则，rails将创建一个新记录。例如，这将更新 recipe_ingred 与 id 1 并创建新的豆浆成分：
 
 
 
 recipe_ingredients_attributes：[{
id：1 
amount：1，
蛋黄，
measure：cup
}，
 {
amount：3，
ingredient：豆浆 b $ bmeasure：cup
}]  
 
I am having trouble with updating my nested attributes when I sending patch request. I want to update my recipe_ingredients when I update my recipe. Every time when I update my recipe, recipe gets updated, but recipe_ingredients are just appending for that recipe. Please help~ Many thanks~

Recipe Controller

```
  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
```

Recipe Model:

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

Curl Request:
```
   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"
                                        }]
      }
    }'
```
解决方案
You need to send id of your recipe_ingredients in the curl request for rails to update the correct existing recipe_ingredient records. Otherwise, rails will create a new record. For example, this will update recipe_ingredient with id 1 and create new "soy milk" ingredient:

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

                        
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