Question

我有两个基本型号：

- Account [id, name]
- Balance [id, account_id, date, balance]

他们的控制器包含来自脚手架的默认代码，而且我已经使用＆＃39;语句修改了余额控制器＆＃39;功能。这允许我计算存储在余额表中的最近日期的所有帐户的总余额。

目前这很好并按预期工作，我的语句视图显示数据。

但是，如何显示所有“＆nbsp;”日期的下拉列表。来自＆＃39;余额＆＃39;表。然后将balances_controller.rb中的@latestDate设置为下拉列表中的选定日期。

我已尝试在statement.html.erb中添加此内容：

  <%= form_for(@balance) do |b| %>
    <%= b.label :date %><br>
    <%= b.collection_select(:date, @dates, :id, :date) %>
  <% end %>

但是，我不确定这是否是正确的方法，这会引发以下错误：

Couldn't find Balance with 'id'=

我的代码：

account.rb

class Account < ActiveRecord::Base
  has_many :balances
  validates :name, presence: true, length: { maximum: 250 },
                  uniqueness: { case_sensitive: false }
end

balance.rb

class Balance < ActiveRecord::Base
  belongs_to :account
  validates :account, presence: true, length: { maximum: 250 }
end

balances_controller.rb

  def index
    @balances = Balance.all.order(date: :desc)
  end

  def new
    @balance = Balance.new
  end

  def statement
    @dates = Balance.all.order('date desc').dates
    @latestDate = Balance.order('date desc').first.date

    @summaryBalances = Balance.joins(:account).order('accounts.credit').where('date = :abc', {abc: @latestDate})

    @assetTotal = Balance.joins(:account).where('date = :abc', {abc: @latestDate}).where("credit = 'f'").sum(:balance)
    @creditTotal = Balance.joins(:account).where('date = :abc', {abc: @latestDate}).where("credit = 't'").sum(:balance)

    @worth = @assetTotal - @creditTotal
  end

余额/ statement.html.erb

<h1>Statement at <%= @latestDate %></h1>

<p>(showing all balances from the (select top 1 date from balances))</p>

<div class="table-responsive">
<table class="table">
  <thead>
    <tr>
      <th>Account</th>
      <th>Balance</th>
      <th colspan="1"></th>
    </tr>
  </thead>

  <tbody>
    <% @summaryBalances.each do |balance| %>
      <tr>
          <% if !(balance.account.credit) %>
            <td><%= balance.account.name %></td>
          <% else %>
            <td><%= balance.account.name + ' (Credit)' %></td>
          <% end %>

        <td class='account-balance'><%= number_to_currency(balance.balance, unit: "£") %></td>
        <td><%= link_to 'Edit', edit_balance_path(balance) %></td>
      </tr>
    <% end %>
  </tbody>
</table>
</div>

<h5>Assets:</h5>
<%= number_to_currency(@assetTotal, unit: "£") %>
<h5>Liabilities:</h5>
<%= number_to_currency(@creditTotal, unit: "£") %>
<h5>Net Worth:</h5>
<%= number_to_currency(@worth, unit: "£") %>

Answer 1

根据您的评论，只需将before语句添加到before_action，如下所示：

before_action :set_balance, only: [:show, :edit, :update, :destroy, :statement]

由于您也从表单中引用@balances，因此您需要在控制器上的语句操作中设置它。

def statement
  @balances = Balance.all # Or whichever balances you want
  # Your existing code here...
end

使用数据填充下拉列表，并在Rails中使用查询中的选定项

1 个答案: