Question

我的问题与此问题类似：Ruby on Rails - Data not saved. Index showing blank values

然而，强大的params匹配答案，似乎没有数据通过。

如果我使用params.require（：banktransaction）.permit（...）我收到一个错误： param丢失或值为空

如果我删除了require部分，则添加一行但没有值。

我查看了视图和控制器并检查了我的拼写，对于我的生活，我无法看到我错过的，有人能指出我正确的方向吗？

控制器：

class BankAccountsController < ApplicationController
  def delete
  end

  def destroy
  end

  def edit
  end

  def update
  end

  def index
    @bankaccount = BankAccount.all
  end

  def show
  end

  def new
    @banktransaction = BankAccount.new(:transactionDate => Time.now, :description => params[:description], :credit => params[:credit], :debit => params[:debit])
  end

  def create
    @banktransaction = BankAccount.new(bank_account_params)
    if @banktransaction.save
      flash[:notice] = "transaction added successfully."
      redirect_to(bank_accounts_path)
    else
      render('new')
    end
  end

  private
    def bank_account_params
      params.require(:banktransaction).permit(:transactionDate,:description,:credit,:debit)
    end
end

查看：

<h1>BankAccounts#new</h1>
<p>Find me in app/views/bank_accounts/new.html.erb</p>
<div class="new transaction">
  <h2>Create Transaction</h2>

  <%= form_for(@banktransaction, :html => {:multipart =>true }) do |f| %>

    <%= render(:partial =>'form', :locals=> {:f => f}) %>

    <div class="form-buttons">
      <%= f.submit("Create Transaction") %>
    </div>

  <% end %>
</div>

表格部分：

<%= f.label(:transactionDate) %>: <%= f.date_field(:transactionDate) %><br>
<%= f.label(:description) %>: <%= f.text_field(:description) %><br>
<%= f.label(:credit) %>: <%= f.number_field(:credit) %><br>
<%= f.label(:debit) %>: <%= f.number_field(:debit) %><br>

路线：

Rails.application.routes.draw do

resources :bank_accounts do
  member do
      get :delete
    end
  end

  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end

Answer 1

简而言之，你只允许错误的params键。它是bank_account，您的bank_account_params应该是

def bank_account_params
  params.require(:bank_account).permit(:transactionDate,:description,:credit,:debit)
end

Rails的表单构建器将根据模型名称而不是变量名来构建params。

您的new操作指定了BankAccount个实例

  def new
    @banktransaction = BankAccount.new(:transactionDate => Time.now, :description => params[:description], :credit => params[:credit], :debit => params[:debit])
  end

因此表单构建器将使用bank_account作为参数键而不是变量名banktransaction

Ruby on Rails - Params中没有数据保存在数据库中

1 个答案: