Question

使用复选框更新嵌套表单，我无法更新表。我收到以下消息：

不允许的参数：：category
ActionController :: Parameters 允许使用{“ name” =>“助焊剂电容器”，“ price” =>“ 19.55”}

我尝试了各种方法来通过允许的参数来解决此问题，包括:category参数，例如：

def product_params
  params.require(:product).permit(:id, :name, :price, :category, categories_attributes: [:id, :name, :category], categorizations_attributes: [:id, :product_id, :category_ids, :category])
end

我的模特

class Product < ApplicationRecord
  has_many :categorizations
  has_many :categories, through: :categorizations
  accepts_nested_attributes_for :categories, reject_if: proc {|attributes| attributes['name'].blank?}
  accepts_nested_attributes_for :categorizations
end

class Categorization < ApplicationRecord
  belongs_to :product, inverse_of: :categorizations
  belongs_to :category, inverse_of: :categorizations
end

class Category < ApplicationRecord
  has_many :categorizations
  has_many :products, through: :categorizations, inverse_of: :category
end

class ProductsController < ApplicationController

  def edit
    @categories = Category.all
  end

  def new
   @product = Product.new
  end

  def create
    @product = Product.new(product_params)
    if @product.save
      flash[:notice] = 'Product succesfully created'
      redirect_to products_path
    else
      flash[:notice] = 'Product was not created'
      render 'edit'
    end
  end

  def update
    if @product.update(product_params)
      flash[:notice] = "Product succesfully updated"
      redirect_to products_path
    else
      flash[:notice] = 'Product was not updated'
      render 'edit'
    end
  end

app / view / products / edit.html.erb

<%= simple_form_for(@product) do |f| %>
  <%= f.input :name %>
  <%= f.input :price %>
  <%= f.simple_fields_for @product.categories do |cats| %>
    <%= cats.collection_check_boxes  :ids, Category.all, :id, :name, collection_wrapper_tag: :ul, item_wrapper_tag: :li %>
  <% end %>
  <%= f.button :submit %>
<% end %>

这似乎很常见，rails和/或simple_form应该以一种更内置的方式提供来执行此操作。我缺少明显的东西吗？

Answer 1

如果我对您的理解正确，那么您应该无需使用accepts_nested_attributes_for或simple_fields_for就能做到这一点。尝试这样的事情：

<%= simple_form_for(@product) do |f| %>
  <%= f.input :name %>
  <%= f.input :price %>
  <%= f.association :categories, as: :check_boxes %>
  <%= f.button :submit %>
<% end %>

您强大的参数应该看起来像这样：

def product_params
  params.require(:product).permit(:id, :name, :price, { category_ids: [] }])
end

嵌套关联has_many;通过不更新collection_check_boxes

1 个答案: