我刚刚在我的博客中引入了类别,并且我已经在帖子上进行了友好的工作。所以我决定也将它整合到类别中。问题是我不断收到错误 Couldn't find Category with 'id'=test-2
以及 ActiveRecord::RecordNotFound in CategoriesController#show
请理解我有尝试实现我在这里找到的许多解决方案,但我就是无法让它发挥作用
class CategoriesController < ApplicationController
before_action :find_category, only: [:show, :update, :edit, :destroy]
def index
@categories = Category.all
end
def new
@category = Category.new
end
def create
@category = Category.new(category_params)
if @category.save
flash[:success] = "Category created"
redirect_to categories_path
else
render 'new'
end
end
def edit
end
def update
if @category.update(category_params)
flash[:success]="name was successfully updated"
redirect_to category_path(@category)
else
render 'edit'
end
end
def show
end
private
def category_params
params.require(:category).permit(:name)
end
def find_category
@category = Category.friendly.find(params[:id])
end
end
现在奇怪的是,当我进入 Rails 控制台并尝试更新 slugs 时,它显示它们如下:
Category.find_each(&:save)
Category Load (0.3ms) SELECT "categories".* FROM "categories" ORDER BY "categories"."id" ASC LIMIT 1000
(0.1ms) begin transaction
Category Exists (0.1ms) SELECT 1 AS one FROM "categories" WHERE ("categories"."id" != 1) AND "categories"."slug" = ? LIMIT 1 [["slug", "sports"]]
上面我们可以看到它写着 slug,sports.. 这很棒,但是当我查找时... slug 似乎为零,如下所示:
2.3.0 :058 > c = Category.find(1)
Category Load (0.8ms) SELECT "categories".* FROM "categories" WHERE "categories"."id" = ? LIMIT 1 [["id", 1]]
=> #<Category id: 1, name: "sports", created_at: "2016-07-28 15:12:13", updated_at: "2016-07-28 15:12:13", slug: nil>
我也试图通过寻找实际的slug来确认这一点:
2.3.0 :051 > Category.find(1).slug
Category Load (0.2ms) SELECT "categories".* FROM "categories" WHERE "categories"."id" = ? LIMIT 1 [["id", 1]]
=> nil
slug 似乎为零。
最后,以防万一它是相关的......这是我的 show.html.erb
<h1 align="center"><%= "Category: " + @category.name %></h1>
<div align = "center">
<% if user_signed_in? %>
<div id="admin_links">
<%= link_to "Edit", edit_category_path(@category) %>
<%= link_to "Delete", category_path(@category), method: :delete, data: {confirm: "Are you sure you want to delete?"} %>
</div>
<% end %>
<%= link_to "Edit Category name", edit_category_path(@category) %>
</div>
这是类别.rb
class Category < ActiveRecord::Base
extend FriendlyId
friendly_id :name, use: :slugged
has_many :category_posts
has_many :posts, through: :category_posts
def should_generate_new_friendly_id?
slug.blank? || name_changed?
end
end
当我在控制台中执行Category.first(5)
时,这就是结果
Category Load (0.3ms) SELECT "categories".* FROM "categories" ORDER BY "categories"."id" ASC LIMIT 5
=> [#<Category id: 1, name: "sports", created_at: "2016-07-28 15:12:13", updated_at: "2016-07-28 15:12:13", slug: nil>,
#<Category id: 2, name: "Nerd", created_at: "2016-07-28 17:33:35", updated_at: "2016-07-28 17:33:35", slug: nil>,
#<Category id: 3, name: "testing", created_at: "2016-07-28 17:38:22", updated_at: "2016-07-28 17:39:23", slug: nil>,
#<Category id: 4, name: "test 2", created_at: "2016-07-28 19:10:18", updated_at: "2016-07-28 19:10:18", slug: nil>,
#<Category id: 5, name: "books", created_at: "2016-07-28 19:29:18", updated_at: "2016-07-28 19:29:18", slug: nil>
最佳答案
在您的 Category
模型中,您有 attr_accessor :slug
,它将覆盖用于数据库中字段的 setter 方法。这意味着 slug
字段将不会被保存。
从模型中删除 attr_accessor :slug
+ 再次重新创建实例以重新生成 slug。
关于ruby-on-rails - Friendly_id slugs 不断返回 nil 导致 ActiveRecord 错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38646457/