Rails 创建新文件后出错 table

Question

（对不起我的英语）你好，我为我的错误创建了一个新的 post 来更清楚地解释发生了什么我添加了一个 table“user-activities”，它让我知道用户是否看到了 activity 这是我的数据库的表示

我的问题是我无法再创建文章显然问题出现在保存中：

日志：

Started POST "/activities" for 127.0.0.1 at 2018-05-24 17:21:49 +0200
Processing by ActivitiesController#create as JS
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"Cq573getfK9HBo4U9xiftsdtmScb08A28AWCcwTq2+Csn7u2hmylpjMdaB5qtJ6ZfWoHV/TZ+zF0xtgPCCp69Q==", "activity"=>{"title"=>"Activity 1 ", "content"=>"<p>dzdzqdqzdqz</p>", "group_id"=>"2"}, "commit"=>"Créer l'activité"}
  User Load (4.6ms)  SELECT  "users".* FROM "users" WHERE "users"."id" =  ORDER BY "users"."id" ASC LIMIT   [["id", 2], ["LIMIT", 1]]
  ↳ /home/benjamin/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0.rc1/lib/active_record/log_subscriber.rb:98
   (0.2ms)  BEGIN
  ↳ app/controllers/activities_controller.rb:9
  Group Load (2.3ms)  SELECT  "groups".* FROM "groups" WHERE "groups"."id" =  LIMIT   [["id", 2], ["LIMIT", 1]]
  ↳ app/controllers/activities_controller.rb:9
   (0.2ms)  ROLLBACK
  ↳ app/controllers/activities_controller.rb:9
Redirected to http://localhost:3000/
Completed 200 OK in 19ms (ActiveRecord: 7.4ms)

#activities_controller.rb:9 =>     if @activity.save

控制器：

  def create
    @activity = Activity.new(activity_params)
    @activity.user = current_user
    if @activity.save
      flash[:notice] = "Votre activité a été créée !"
      redirect_to root_path
    else
      flash[:alert] = "Erreur lors la création"
      redirect_to root_path
    end
  end

当我添加新的 table 并且创建新的表单 activity 时控制器没有改变 activity 不包含错误（Group id / user IS / content /title /date etcc. . 有效)

是我的模型变了:

之前

Activity 型号：

class Activity < ApplicationRecord
  belongs_to :user
  belongs_to :group
  validates :content, presence: true
end

user-model :

class User < ApplicationRecord
  rolify
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
  has_many :user_groups
  has_many :activities
end

之后：

Activity 型号：

class Activity < ApplicationRecord
  has_many :user_activities, dependent: :destroy
  has_many :users, through: :user_activities
  belongs_to :user, class_name: 'User'
  belongs_to :group
  validates :content, presence: true
end

User-activity 型号：

class UserActivity < ApplicationRecord
  belongs_to :activity
  belongs_to :user    
end

user-model :

class User < ApplicationRecord
  rolify
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
  has_many :user_groups
  has_many :user_activities
  has_many :activities, through: :user_activities

end

谢谢:)

Answer 1

在开发过程中，它可能必须像 @activity.save 一样替换为 @activity.save! 并得到一个异常，其中包含有关您遇到的错误的更多详细信息。

Rails 创建新文件后出错 table

Rails Having a error after creating new table

ruby-on-rails

database

model

has-many-through

has-many