Rails admin has_many：通过关系在编辑资源时导致模板无限呈现

时间：2014-10-29 14:59:37

标签： ruby-on-rails activerecord associations has-many-through rails-admin

我有一个带有has_many的rails应用程序：通过这样的模型：

class Blog < ActiveRecord::Base
  has_many :blog_categorizations, dependent: :destroy
  has_many :categories, :through => :blog_categorizations
  accepts_nested_attributes_for :categories, allow_destroy: true
end

class Category < ActiveRecord::Base
  has_many :blog_categorizations, dependent: :destroy
  has_many :blog, :through => :blog_categorizations
  accepts_nested_attributes_for :blog, allow_destroy: true
end

class BlogCategorization < ActiveRecord::Base
  belongs_to :blog
  belongs_to :category
end

在我的Rails管理配置中，我有：

config.model Blog do
    edit do
      field :title
      field :content
      field :source
      field :author
      field :date
      field :photos
      field :categories
    end
  end

现在，当我尝试通过rails_admin添加新博客，或尝试编辑预先存在的博客时，我得到了无限渲染的rails_admin模板，如下所示：

Started GET "/admin/recipe/new?_pjax=%5Bdata-pjax-container%5D" for 127.0.0.1 at 2014-10-29 07:41:35 -0700
  ActiveRecord::SchemaMigration Load (0.8ms)  SELECT "schema_migrations".* FROM "schema_migrations"
Processing by RailsAdmin::MainController#new as HTML
  Parameters: {"_pjax"=>"[data-pjax-container]", "model_name"=>"recipe"}
  User Load (1.0ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = 1  ORDER BY "users"."id" ASC LIMIT 1
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (2.3ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_text.html.haml (1.0ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (0.2ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (0.2ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_datetime.html.haml (1.7ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_nested_many.html.haml (25.6ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_nested_many.html.haml (16.2ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_submit_buttons.html.haml (2.9ms)
   (0.6ms)  SELECT COUNT(*) FROM "blogs"
  Recipe Load (0.7ms)  SELECT "blogs".* FROM "blogs"   ORDER BY blogs.id desc
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_filtering_select.html.haml (14.3ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_file_upload.html.haml (4.0ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (0.3ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (1.6ms)
   (0.4ms)  SELECT COUNT(*) FROM "blog_categorizations"
  BlogCategorization Load (0.3ms)  SELECT "blog_categorizations".* FROM "blog_categorizations"   ORDER BY blog_categorizations.id desc
  Category Load (0.5ms)  SELECT "categories".* FROM "categories"  WHERE "categories"."id" IN (1, 5)
  Recipe Load (0.3ms)  SELECT "blogs".* FROM "blogs"  WHERE "blogs"."id" IN (65)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_filtering_multiselect.html.haml (22.1ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_nested_many.html.haml (1.6ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (0.2ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_text.html.haml (0.3ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (0.2ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (0.2ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_datetime.html.haml (0.9ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_nested_many.html.haml (1.3ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_nested_many.html.haml (1.2ms)
  CACHE (0.0ms)  SELECT "blogs".* FROM "blogs"   ORDER BY blogs.id desc
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_filtering_select.html.haml (4.0ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_file_upload.html.haml (0.5ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (0.2ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (0.2ms)
  CACHE (0.0ms)  SELECT "blog_categorizations".* FROM "blog_categorizations"   ORDER BY blog_categorizations.id desc
  CACHE (0.0ms)  SELECT "categories".* FROM "categories"  WHERE "categories"."id" IN (1, 5)
  CACHE (0.0ms)  SELECT "blogs".* FROM "blogs"  WHERE "blogs"."id" IN (65)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_filtering_multiselect.html.haml (3.9ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_nested_many.html.haml (1.1ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (0.2ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_text.html.haml (0.3ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (0.2ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_field.html.haml (0.2ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_datetime.html.haml (1.0ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_nested_many.html.haml (1.2ms)
  Rendered /Users/adam419/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails_admin-0.6.3/app/views/rails_admin/main/_form_nested_many.html.haml (1.2ms)

同样的输出只是无限发生并且似乎没有停止，几乎就像它进入了加载博客类别，类别博客等的无限循环一样。

如何阻止这种情况发生？

1 个答案:

答案 0 :(得分：0)

删除accepts_nested_attributes_for：Category.rb中的博客解决了问题

accepts_nested_attributes_for :blog

以前是在Category.rb中，但在发布的代码中删除了。

另外，离开

accepts_nested_attributes_for :blog

但为博客模型添加了inverse_of：category，如

has_many :blog, :through => :blog_categorizations, inverse_of: category

和

has_many :blog, :through => :blog_categorizations, inverse_of: blog

导致问题消失。我目前正在使用inverse_of选项，即使它不适用于：通过模型，但出于某种原因，Rails管理员可以在多对多中使用。

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