Rails 6 字段必填但不接受 0 或 Null

Question

我已将我的项目从 Rails 4 转移到 Rails 6，直到最近，一切正常，但现在当我更新数据库中的特定条目时，出现错误说明“老板必须存在”。问题是有一群人是老板却没有老板。

我已经检查了我的架构，该字段不是必需的。 (boss_id)

person.rb

class Person < ApplicationRecord
    belongs_to :boss, class_name: 'Person'
    has_many :subordinates, class_name: 'Person', foreign_key: 'boss_id'
end

form.html.erb

<fieldset>
        <label>
            Boss
            <%= f.select :boss_id, [[" ", :null], ["Name1", 1], ["Name2", 2], ... etc ... %>
        </label>
</fieldset>

adminnamespace/people_controller.rb

class NameSpace::PeopleController < NameSpaceController

  def index
    @people = Person.all
  end

  def show
    @person = Person.find(params[:id])
  end

  def new
    @person = Person.new
  end

  def create
    @person = Person.new(person_params)

    if @person.save
      flash[:notice] = "Person created successfully!"
      redirect_to namespace_person_path(@person)
    else
      render :new, status: :unprocessable_entity
    end
  end

  def edit
    @person = Person.find(params[:id])
  end

  def update
    @person = Person.find(params[:id])

    if @person.update(person_params)
      redirect_to namespace_person_path(@person)
    else
      render :edit, status: :unprocessable_entity
    end
  end

  def destroy
    person = Person.find(params[:id])
    person.destroy
    redirect_to namespace_people_path
  end

  private
  def person_params
    params.require(:person).permit(
      :uname, ... :boss_id) 
  end
end

如果 boss_id 设置为 0 或没有对应记录的数字，我会收到此错误。我需要变通办法还是有办法让它像以前那样工作？

Answer 1

您应该能够将 required: false 添加到 belongs_to 语句。

例如：

class Person < ApplicationRecord
    belongs_to :boss, class_name: 'Person', required: false
    has_many :subordinates, class_name: 'Person', foreign_key: 'boss_id'
end

Rails 6 字段必填但不接受 0 或 Null

Rails 6 Field Required but will not accept 0 or Null

ruby-on-rails

ruby-on-rails-6