我的_form中有三个嵌套表单;成分,说明和营养。前两个工作正常,但营养不会显示任何形式。如果我将“营养”重命名为表单中显示的其他内容,但由于它是错误的名称,因此params无法正确发送,因此无效。我觉得这是一个小东西,我忽略了,但想得到任何人的投入。
recipe.rb 相关位
class Recipe < ActiveRecord::Base
has_many :ingredients, dependent: :destroy
validates :ingredients, presence: true
has_many :instructions, dependent: :destroy
validates :instructions, presence: true
accepts_nested_attributes_for :ingredients, reject_if: :all_blank, allow_destroy: true
accepts_nested_attributes_for :instructions, reject_if: :all_blank, allow_destroy: true
has_one :nutrition, dependent: :destroy
accepts_nested_attributes_for :nutrition
end
nutrition.rb
class Nutrition < ActiveRecord::Base
belongs_to :recipe
end
ingredient.rb 用于与营养.rb进行比较
class Ingredient < ActiveRecord::Base
belongs_to :recipe
validates :name, presence: true
end
recipes_controller.rb
的相关部分class RecipesController < ApplicationController
# GET /recipes/new
def new
@recipe = Recipe.new
end
# POST /recipes
def create
@recipe = current_user.recipes.new(recipe_params)
if @recipe.save
@recipe.upvote_by current_user
redirect_to @recipe, notice: 'Recipe was successfully created.'
else
render :new
end
end
# PATCH/PUT /recipes/1
def update
if @recipe.update(recipe_params)
redirect_to @recipe, notice: 'Recipe was successfully updated.'
else
render :edit
end
end
private
# Never trust parameters from the scary internet, only allow the white list through.
def recipe_params
params.require(:recipe).permit(:name, :description, :image, :url, :category_id, ingredients_attributes: [:id, :name, :_destroy], instructions_attributes: [:id, :body, :image, :_destroy], nutrition_attributes: [:id, :serves, :serving_size, :calories, :fat, :carbs, :fiber, :protein])
end
end
_form.html.erb
<%= form_for @recipe, html: { multipart: true } do |f| %>
<h3>Nutrition</h3>
<div class="nutrition">
<%= f.fields_for :nutrition do |n| %>
<%# if I rename :nutrition to anything else the fields show, it seems to not enter this at all with :nutrition %>
<%= render 'nutrition_fields', f: n %>
<% end %>
</div>
<h3>Ingredients</h3>
<div class="ingredients">
<%= f.fields_for :ingredients do |ingredient| %>
<%= render 'ingredient_fields', f: ingredient %>
<% end %>
<div class="links">
<%= link_to_add_association 'add ingredient', f, :ingredients %>
</div>
</div>
<h3>Instructions</h3>
<div class="instructions">
<%= f.fields_for :instructions do |instruction| %>
<%= render 'instruction_fields', f: instruction %>
<% end %>
<div class="links">
<%= link_to_add_association 'add step', f, :instructions %>
</div>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
_nutrition_fields.html.erb
<div class="nested-fields">
<div class="field">
<%= f.label "Serves" %><br>
<%= f.text_field :serves %>
</div>
<div class="field">
<%= f.label "Serving Size" %><br>
<%= f.text_field :serving_size %>
</div>
<div class="field">
<%= f.label "Calories" %><br>
<%= f.text_field :calories %>
</div>
<div class="field">
<%= f.label "Fat" %><br>
<%= f.text_field :fat %>
</div>
<div class="field">
<%= f.label "Total Carbohydrates" %><br>
<%= f.text_field :carbs %>
</div>
<div class="field">
<%= f.label "Fiber" %><br>
<%= f.text_field :fiber %>
</div>
<div class="field">
<%= f.label "Protein" %><br>
<%= f.text_field :protein %>
</div>
</div>
答案 0 :(得分:1)
class RecipesController < ApplicationController
# GET /recipes/new
def new
@recipe = Recipe.new
@nutrition = @recipe.build_nutrition
end
字段:
<%= f.fields_for :nutrition, @nutrition do |n| %>
您必须在控制器中构建关联,以便默认显示has_one fields_for。