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ruby-on-rails - 编辑中的 Belongs_to 关系

问题描述

我在编辑具有belongs_to 关系（extra_guest belongs_to age_table）的表单时遇到问题。

我能够创建一个新的 extra_guest 并将其分配给一个 age_table，但我无法让编辑/更新工作，因为我的更新函数返回一个 falseClass。-->@extra_guest.update(extra_guest_params).errors.full_messages返回undefined method `errors' for false:FalseClass

代码

楷模

class ExtraGuest < ApplicationRecord
  belongs_to :age_table
  validates :age_table, presence: true
end

class AgeTable < ApplicationRecord
  belongs_to :park
  has_many :extra_guests, dependent: :destroy
  validates :name, :age_from, :age_to, presence: true
  validates_associated :extra_guests
end

class Attraction < ApplicationRecord
  belongs_to :park

  has_many :extra_guests, dependent: :destroy
  accepts_nested_attributes_for :extra_guests, allow_destroy: true

  validates :name, presence: true
end

class Park < ApplicationRecord
  has_many :attractions, dependent: :destroy
  has_many :age_tables, dependent: :destroy
  validates :name, :currency, presence: true
end

extra_guests_controller

def edit
    @extra_guest = ExtraGuest.find(params[:id])
    @age_table = @extra_guest.age_table
    @age_table_list = AgeTable.where(park: @attraction.park)
  end

  def update
    @extra_guest = @attraction.extra_guests.find(params[:id])
    @age_table = AgeTable.find(params[:age_table])
    authorize @extra_guest
    if @extra_guest = @extra_guest.update(extra_guest_params)
      redirect_to root_path
    else
      @attraction = Attraction.find(params[:attraction_id])
      @extra_guest = ExtraGuest.find(params[:id])
      @age_table_list = @attraction.park.age_tables
      render 'edit'
    end
  end

private
  def extra_guest_params
    params.require(:extra_guest).permit(:name, :age_table_id,
      extra_guest_prices_attributes: [:id, :name, :price_type, :start_date, :end_date, :price, :duration, :duration_min, :duration_max, :backend_only, :weekend_extra, :_destroy])
  end

意见/额外的客人/表格

<%= simple_form_for [@attraction, @extra_guest] do |f|%>
     <%= f.input :age_table, :as => :select, :selected => @age_table.id, :collection => @age_table_list.map {|u| [u.name, u.id]}, :include_blank => false %>
<% f.button :submit %>

错误信息 + 参数


Couldn't find AgeTable without an ID

{"utf8"=>"✓",
 "_method"=>"patch",
 "authenticity_token"=>"l8HMnVIRybZg==",
 "extra_guest"=>
  {"age_table"=>"104",
   "extra_guest_prices_attributes"=>
    {"0"=>{"price"=>"1.0", "weekend_extra"=>"", "start_date"=>"2019-10-15", "end_date"=>"20-09-2019", "duration"=>"", "duration_min"=>"", "duration_max"=>"", "_destroy"=>"false", "id"=>"42"},
     "1"=>{"price"=>"1.0", "weekend_extra"=>"", "start_date"=>"2019-10-15", "end_date"=>"2019-10-16", "duration"=>"", "duration_min"=>"", "duration_max"=>"", "_destroy"=>"false", "id"=>"43"}}},
 "commit"=>"Save new option",
 "attraction_id"=>"185",
 "id"=>"55"}

标签： ruby-on-railsactiverecordsimple-form-for

解决方案

方法update 返回true或false。你可以在这里找到文档。要检查错误，您需要errors在@extra_guest对象上调用方法。

@extra_guest.update(extra_guest_params)
@extra_guest.errors.full_messages

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