Rails导入JSON不在postgresql中创建对象

Question

所以我正在导入一个 JSON 文件，但是当我去创建对象时，没有生成 id。

这是我的导入方法：

namespace :fieldfacts do
  desc "Import Topics"
  task :import_topics => :environment do
    records = JSON.parse(File.read('public/topics.json'))
    records.each do |record|
      a = Topic.create
      a.name = record['name']
      a.save
    end
  end
end

这是错误：

而且我认为没有 id 就不会保存它。那么我如何在那里获得一个ID？谢谢！

编辑：根据主题模型，我需要通过topics_owners设置一个user_id，但是我该怎么做呢？

主题模型

  has_many :topics_owners
  has_many :users, -> { uniq }, through: :topics_owners
  validates :name, presence: true
  validates :user_ids, presence: {:message => "There must be an assigned Topic Owner to continue."}
  validates :name, uniqueness: true

控制器

def topic_params
      params.require(:topic).permit(:name, :description, :active, [keywords: [:id, :keyword]], [keywords_deleted: [:keyword]], :keywords_list, :keywords_list_deleted,
        :organizations_list, :organizations_list_deleted, [organizations: [:id, :organization]], [organizations_deleted: [:organization]],
        :social_groups_list, :social_groups_list_deleted, [social_groups: [:id, :social_group]], [social_groups_deleted: [:social_group]],
        :feeds_list, :feeds_list_deleted, [feeds: [:id, :feed, :source_url]], [feeds_deleted: [:feed]],
        {:articles_list => []}, :articles_list_deleted, :influencers, {:feeds_list => []},
        :articles_object, {:feeds_object => []}, :topic_api_id, :read_only, {user_ids: []}, {:influencers_ids => []},
        [:people_relevants => [:name, :id, :influencer_id, :topic_id]],
        [influencers_adds: [:id, :weight, :influencers_add]], [:influencers_deleted => [:id]], [:influencers_list_deleted => [:id => []]],
        [people: [:id, :person, :weight]], [people_deleted: [:person]],
        [influencers_topics_attributes: [:influencer_id, :id, :_destroy]], :updater_id, :creator_id,
        [influencer_attributes: [:name, :active]])
    end

Schema.rb

  create_table "topics", force: true do |t|
    t.string   "name"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.integer  "influencers_topics_count", default: 0,     null: false
    t.text     "description"
    t.integer  "creator_id"
    t.integer  "updater_id"
    t.boolean  "read_only"
    t.string   "topic_api_id"
    t.integer  "people_relevants_count"
    t.boolean  "active",                   default: false
    t.datetime "activation_date"
  end

  add_index "topics", ["name"], name: "index_topics_on_name", using: :btree

  create_table "topics_owners", force: true do |t|
    t.integer  "topic_id"
    t.integer  "user_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  add_index "topics_owners", ["topic_id"], name: "index_topics_owners_on_topic_id", using: :btree
  add_index "topics_owners", ["user_id"], name: "index_topics_owners_on_user_id", using: :btree

Answer 1

您可能应该使用a.save! 而不是a.save（create 也是如此）。非爆炸返回 true 或 false 表示成功/失败（您将忽略）。 bang 版本在失败时引发异常。这会让你立即知道有问题。

另外，如果你想找出问题所在，你可以查看a.errors，尤其是a.errors.full_messages（带有非爆炸save和create，所以你仍然可以参考a） .在这种情况下，问题是您的某些验证失败（user_ids 是必需的，也可能是非唯一的 name）。