Question

我有Financing模型，has_many: :professional_investments。

要编辑Financing，主表单包含professional_investments的嵌套表单。

我决定现在显示一个8 professional_investments的固定列表，因为Cocoon gem与Trailblazer的Reform不匹配。

我使用了两个Reform表单对象：FinancingForm和嵌套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，我创建了表单对象，并预先填充它：

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

它有效，但空白ProfessionalInvestment也会保存在集合中，就像skip_if:参数无效一样。

如果我未在@financing_form.prepopulate!中致电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，而不是完整预先填充的8个项目列表。

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

如何使用Reform gem预先填充嵌套表单属性？

0 个答案: