Question

我有以下模特协会：

class Receipt < ApplicationRecord
  validates :name, presence: true
  has_many :items, inverse_of: :receipt
  accepts_nested_attributes_for :items
end

class Item < ApplicationRecord
  validates :name, presence: true
  belongs_to :receipt, inverse_of: :items
  belongs_to :variant, inverse_of: :items
end

class Variant < ApplicationRecord
  validates :name, presence: true
  belongs_to :product, inverse_of: :variants
  has_many :items, inverse_of: :variant
end

尝试使用simple_form提交一个新收据，其中包含从以下变体中选择的项目：

<%= simple_form_for @receipt do |f| %>
    <div class="form-inputs">
      <%= f.input :name, label: 'Receipt Number', required: :true %>
    </div>
    <div class="form-inputs">
      <%= f.simple_fields_for :items do |builder| %>
      <%= builder.collection_select(:variant, Variant.all, :id, :name, {prompt: 'Choose a Variant'}) %>
      <% end %>
    </div>
    <br />
    <div class="form-actions">
      <%= f.button :submit, 'Save Receipt', class:"btn btn-primary" %>
    </div>
  <% end %>

控制器操作：

def new
    @receipt = Receipt.new
    @receipt.items.build
  end

def create
    @receipt = Receipt.create(receipt_params)
    puts receipt_params
    if @receipt.valid?
      redirect_to receipts_path
    else
      render :new, status: :unprocessable_entity
    end
  end

  private

  def receipt_params
    params.require(:receipt).permit(:name, items_attributes: [:id, :name])
  end

我可以在表单中为新项目选择变体（以不同的形式和操作创建）但在提交既不接收也不存储项目。终端读取未允许的参数：

* ReceiptsController处理#create as HTML 参数：{“utf8”=＆gt;“✓”，“authenticity_token”=＆gt;“tugJchKiHNKwQ53E / LGCJacbrqV86ydLHolRuaB9ngZJ4gQrodOLqrxki2fAwgEfpBkbbAOA2GtfHRjsqjWYyQ ==”，“收据”=＆gt; {“name”=＆gt;“bhbh”，“items_attributes”=＆gt; {“0”=＆gt; {“variant”=＆gt;“2”}}}，“commit”=＆gt;“保存收据”} 未允许的参数：变体（0.2ms）BEGIN （0.1ms）ROLLBACK 未允许的参数：variant

在布局/应用程序中渲染收据/ new.html.erb 变量负载（0.4ms）SELECT“variants”。* FROM“variants” 在布局/应用程序中呈现收据/ new.html.erb（18.2ms）在473ms完成422个不可处理的实体（浏览次数：465.0ms | ActiveRecord：0.8ms）*

Answer 1

尝试使用

<%= builder.collection_select(:variant_id, Variant.all, :id, :name, {prompt: 'Choose a Variant'}) %>

而不是

<%= builder.collection_select(:variant, Variant.all, :id, :name, {prompt: 'Choose a Variant'}) %>

请参阅，我使用variant_id代替variant

另外，允许variant_id

def receipt_params
  params.require(:receipt).permit(:name, items_attributes: [:id, :name, :variant_id])
end

Rails 5来自collection_select unpermited参数的accept_nested_attributes

1 个答案: