Rails中的嵌套属性

Question

I am trying to build a small recipe website. But when I try to use nested attribute for saving my child(recipe_ingredients) table through parent(recipe) action. It only generating ids for me without any data in it. Could any one help?

Model for recipe:

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

Model for recipe_ingredients:

class RecipeIngredient < ActiveRecord::Base
  belongs_to :recipe, inverse_of: :recipe_ingredients
end

Controller for recipe:

 def create
  @recipe = Recipe.new(recipe_params)
  @recipe.recipe_ingredients.build
  ***binding.pry***

 if @recipe.save
   render json: @recipe, status: :created, location: @recipe
 else
   render json: @recipe.errors, status: :unprocessable_entity
 end
end

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

```

After I check with rails console, my recipe_params is like below

[7] pry(#<RecipesController>)> recipe_params Unpermitted parameter: recipe_ingredients => {"name"=>"an example recipe", "category"=>"fry", "instructions"=>["do it", "ignore it"]} I don't know how to solve that "Unpermitted parameter" problem. Please help~ Thank you~

Answer 1

尝试将您的recipe_params方法中的params.require（：recipes）更改为params.require（：recipe）希望对您有所帮助。