在使用 ruby on rails 上的嵌套属性播种后，ID 没有关联？答案

【问题标题】：Id is not associated after seeding with nested attributes on ruby on rails?在使用 ruby on rails 上的嵌套属性播种后，ID 没有关联？
【发布时间】：2016-06-22 02:24:29
【问题描述】：

为什么我播种后space_listing_id是空的？

我的模型上有这个。

 class SpaceListing < ActiveRecord::Base
  belongs_to :user
  has_many :images, dependent: :destroy
  has_many :bookings, dependent: :destroy
  has_many :favorites
  has_many :reviews, dependent: :destroy
  accepts_nested_attributes_for :images, allow_destroy: true

 validates :title, presence: true
 validates :description, presence: true
 validates :day_rent, presence: true
 validates :monthly_rent, presence: true
 validates :space_type, presence: true
 validates :environment_type, presence: true
 validates :size_length, presence: true
 validates :size_width, presence: true
 validates :size_height, presence: true
end

这就是我的seed.rb 拥有的：

SpaceListing.create!([
  {
user_id: 1,
title: "Hipster Vest",
description: "Hipster's favorite spot",
street_number: "10",
route: "Hipster Street",
city: "San Francisco",
state: "CA",
zip_code: "94108",
country: "United States",
space_type: "Garage",
environment_type: "Outdoor",
monthly_rent: 100,
day_rent: 3,
size_width: 10,
size_height: 10,
size_length: 10,
latitude: 37.7875474,
longitude: -122.4049517,
images_attributes: [
   {image_url: "https://media.giphy.com/media/26BRwxtVBt8dWEuGs/giphy.gif",
    space_listing_id: },
   {image_url: "https://media.giphy.com/media/l3UcgEIw80eyb36kU/giphy.gif"}
  ]
 }
])

【问题讨论】：

标签： ruby-on-rails nested-attributes seed

【解决方案1】：

accepts_nested_attributes 创建一个新属性，该属性可以传递给 ActiveRecord 方法，例如 .create 和 .update。在您的情况下，该属性将被称为:images_attributes。

以下代码将解决您的问题。

SpaceListing.create!([
  {
    user_id: 1,
    title: "Hipster Vest",
    description: "Hipster's favorite spot",
    street_number: "10",
    route: "Hipster Street",
    city: "San Francisco",
    state: "CA",
    zip_code: "94108",
    country: "United States",
    space_type: "Garage",
    environment_type: "Outdoor",
    monthly_rent: 100,
    day_rent: 3,
    size_width: 10,
    size_height: 10,
    size_length: 10,
    latitude: 37.7875474,
    longitude: -122.4049517,
    images_attributes: [
      { image_url:  "https://media.giphy.com/media/26BRwxtVBt8dWEuGs/giphy.gif"},
      { image_url:  "https://media.giphy.com/media/l3UcgEIw80eyb36kU/giphy.gif"}
    ]
  }
])

更新：你似乎已经更新了这个问题。我会回答的。您不需要在属性哈希中包含:space_listing_id。使用我上面发布的代码，Rails 将自动关联记录并填充 :space_listing_id 键。

【讨论】：