的Rails的ActiveRecord :: InvalidForeignKey在ArticlesController＃破壞

Question

ActiveRecord::InvalidForeignKey in ArticlesController#destroy 

SQLite3::ConstraintException: FOREIGN KEY constraint failed: DELETE FROM "articles" WHERE "articles"."id" = ? 

我創建一個博客的應用程序，每次我試圖刪除它有評論文章時出現此錯誤。我該如何解決它？

讓我知道什麼代碼發佈，我會更新問題。

文章控制器：

class ArticlesController < ApplicationController 
    def new 
     @article = Article.new 
    end 

    def index 
    #@articles = Article.all 
    @articles = Article.paginate(:page => params[:page], :per_page => 10) 
    end 

    def show 
     @article = Article.find(params[:id]) 
    end 

    def create 
     @article = Article.new(article_params) 

     @article.save 
     redirect_to @article 
    end 

    def edit 
     @article = Article.find(params[:id]) 
    end 

    def update 
     @article = Article.find(params[:id]) 
     if @article.update(article_params) 
      redirect_to @article 
     else 
      render 'edit' 
     end 

    end 

    def destroy 
     @article = Article.find(params[:id]) 
     @article.destroy 

     redirect_to articles_path 
    end 
end 

private 
def article_params 
    params.require(:article).permit(:title, :text, :datee) 
end 

文章型號：

class Article < ApplicationRecord 
    has_many :comments 
    has_many :photos 
end 

評價模型：

class Comment < ApplicationRecord 
    belongs_to :article 
end 

---

UPDATE

現在我有一個新的錯誤

ArgumentError in ArticlesController#destroy 

Unknown key: :dependant. Valid keys are: :class_name, :anonymous_class, :foreign_key, :validate, :autosave, :table_name, :before_add, :after_add, :before_remove, :after_remove, :extend, :primary_key, :dependent, :as, :through, :source, :source_type, :inverse_of, :counter_cache, :join_table, :foreign_type, :index_errors 

Answer 1

爲了避免這個問題，你可以在Article模型中定義dependent: :delete_all所以每一個相關Comment也被刪除，就像這樣：

class Article < ApplicationRecord 
    has_many :comments, dependent: :delete_all 
end 

Answer 2

使用dependent: :delete_all不使用驗證，因此它直接刪除記錄而無需正確驗證。如果您希望安全地驗證您的記錄，請使用dependent: :destroy。

class Article < ApplicationRecord 
    has_many :comments, dependent: :destroy 
end