[英]foreign key constraint, blog post, acts_as_votable
因此,我安裝了gemact_as_votable或它的任何名稱。 很棒的投票系統。 但是,在我的管理員中,當我刪除博客文章時,我得到了一個sqlite外鍵約束失敗的錯誤消息。 我知道這與數據庫表有關,如果您嘗試刪除一個表上具有另一個表上的外鍵的表上的記錄,這會導致問題,除非為外鍵定義了on_delete :: cascade,等等。不知道如何為acts_as_votable gem執行此操作。 有人知道嗎 謝謝!
博客模型:
class HomeBlog < ApplicationRecord
mount_uploader :image, ImageUploader
has_many :hashtaggings
has_many :hashtags, through: :hashtaggings
acts_as_votable
def all_hashes=(names)
self.hashtags = names.split(",").map do |name|
Hashtag.where(name: name.strip).first_or_create!
end
end
def all_hashes
self.hashtags.map(&:name).join(", ")
end
end
博客控制器:
class Admin::HomeBlogsController < Admin::AdminController
before_action :set_home_blog, only: [:show, :destroy]
def destroy
@admin_home_blog.destroy!
respond_to do |format|
format.html { redirect_to admin_home_blogs_path, notice: 'Blog post was successfully deleted.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_home_blog
@admin_home_blog = Admin::HomeBlog.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def admin_home_blog_params
params.require(:home_blog).permit(:name, :entry, :image, :all_hashes)
end
end
頁面視圖:
<h3 id="blog-index-title">Blog Posts</h3>
<span class="pagination"><%= will_paginate @admin_home_blogs %></span>
<% @admin_home_blogs.each do |h| %>
<div id="admin-blog-index">
<%= link_to h.name, h %> | <button type="button"><%= link_to "delete", admin_home_blog_path(h), :style=>'color:white', method: :delete, data: {confirm: "Are you sure?"}%></button>
</div><br />
<% end %>
錯誤信息:
SQLite3 :: ConstraintException:外鍵約束失敗:從“ home_blogs”中刪除“ home_blogs”中的“ id” =?
我相信這個問題是您刪除帖子時需要銷毀依賴該帖子的記錄。
...
has_many :hashtaggings, dependent: :destroy
has_many :hashtags, through: :hashtaggings, dependent: :destroy
...
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