Question

所以我一直在尝试测试我的模型，看看我是否可以使用Gallery.new(:picture => File.new('E:\Owner (Backup)\Pictures\Skateboard 1.jpg', 'r'))通过rails控制台添加图片，但我得到以下错误。我正在这样做，因为我无法在我的rails应用程序中保存图片，我只是重新呈现new模板和新视图中列出的表单部分。

我想知道如何解决这些错误，因为我可以看到我的模型很好。我的迁移似乎也很好。我认为accept_nested_attributes_for允许Picture模型属性通过Gallery模型传递。

控制台中的错误是

irb(main):002:0> Gallery.new(:picture => File.new('E:\Owner (Backup)\Pictures\Skateboard 1.jpg', 'r'))
ActiveModel::UnknownAttributeError: unknown attribute 'picture' for Gallery.
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activemodel-5.0.1/lib/active_model/attribute_assignment.rb:48:in `_assign_attribute'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activemodel-5.0.1/lib/active_model/attribute_assignment.rb:40:in `block in _assign_attributes'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activemodel-5.0.1/lib/active_model/attribute_assignment.rb:39:in `each'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activemodel-5.0.1/lib/active_model/attribute_assignment.rb:39:in `_assign_attributes'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-5.0.1/lib/active_record/attribute_assignment.rb:26:in `_assign_attributes'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activemodel-5.0.1/lib/active_model/attribute_assignment.rb:33:in `assign_attributes'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-5.0.1/lib/active_record/core.rb:319:in `initialize'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-5.0.1/lib/active_record/inheritance.rb:65:in `new'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-5.0.1/lib/active_record/inheritance.rb:65:in `new'
    from (irb):2
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-5.0.1/lib/rails/commands/console.rb:65:in `start'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-5.0.1/lib/rails/commands/console_helper.rb:9:in `start'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:78:in `console'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
    from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-5.0.1/lib/rails/commands.rb:18:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'irb(main):003:0> ^C
irb(main):003:0>

我的模特是画廊

class Gallery < ApplicationRecord
  has_many :pictures
  validates :name, presence: true
  validates :cover, presence: true
  accepts_nested_attributes_for :pictures, allow_destroy: true
end

照片

class Picture < ApplicationRecord
  belongs_to :gallery
  validates :gallery_id, presence: true
  validates :picture, presence: true
  mount_uploader :picture, PictureUploader
  serialize :picture, JSON
end

迁移，画廊

class CreateGalleries < ActiveRecord::Migration[5.0]
  def change
    create_table :galleries do |t|
      t.string :name
      t.integer :cover

      t.timestamps
    end
  end
end

图片

class CreatePictures < ActiveRecord::Migration[5.0]
  def change
    create_table :pictures do |t|
      t.integer :gallery_id
      t.string :picture

      t.timestamps
    end
  end
end

Answer 1

ActiveModel :: UnknownAttributeError：未知属性＆＃39;图片＆＃39;对于库。

你做错了。您应关联图片与 图库实例 而是将其作为 属性传递给图库模型 。

g = Gallery.new(name: 'Some Name', cover: 'Some Cover')
g.save!
p = g.pictures.new(picture: File.new('E:\Owner (Backup)\Pictures\Skateboard 1.jpg', 'r'))
p.save!

无法通过rails控制台中的父模型保存子属性ActiveModel :: UnknownAttributeError：

1 个答案: