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我有一个Financing模型has_many: :professional_investments。

要编辑Financing，主窗体有一个用于 的嵌套窗体professional_investments。

我决定暂时显示一个 8 的固定列表professional_investments，因为Cocoon宝石与 Trailblazer 的Reform.

我使用两个Reform表单对象：一个FinancingForm和一个嵌套ProfessionalInvestmentForm：

class FinancingForm < Reform::Form
  collection :professional_investments,
    form: ProfessionalInvestmentForm,
    prepopulator: :prepopulate_professional_investments,
    populate_if_empty: :populate_professional_investments!,
    skip_if: :professional_investment_blank?

  def prepopulate_professional_investments(options)
    [8 - professional_investments.size, 0].max.times do
      professional_investments << ProfessionalInvestment.new
    end
  end

  def populate_professional_investments!(fragment:, **)
    ProfessionalInvestment.new unless professional_investment_blank?(fragment: fragment)
  end

  def professional_investment_blank?(fragment:, **)
    fragment['professional_investor_id'].blank? && fragment['amount'].to_d.zero?
  end
end

在控制器中，我创建表单对象并预填充它：

class FinancingsController < ApplicationController
  def edit
    @financing_form = FinancingForm.new(@financing)
    @financing_form.prepopulate!
  end

  def update
    @financing_form = FinancingForm.new(@financing)
    @financing_form.prepopulate!
    if @financing_form.validate(financing_params)
      @financing_form.save
    end
  end
end

它可以工作，除了空白ProfessionalInvestment也保存在集合中，就好像skip_if:参数没有效果一样。

如果我不调用@financing_form.prepopulate!，update则不会按预期保存空白记录。但是，如果存在验证错误，则仅显示现有记录，而不是完整的预填充 8 项列表。

如何防止保存这些空白记录，同时仍然在update操作中显示整个预填充的嵌套列表？

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