Ruby on rails Rails 3：属性没有方法错误

我收到以下错误消息：

NoMethodError in UploadStepsController#update

undefined method `attributes=' for #<ActiveRecord::Relation:0x00000104775c40>


app/controllers/upload_steps_controller.rb:12:in `update'

NoMethodError在UploadStepsController中#更新
未定义的方法“attributes=”用于#
app/controllers/upload\u steps\u controller.rb:12:in'update'

我目前正在构建一个允许用户上传文件的向导，使用邪恶向导gem。我错过了什么

上传\u步骤\u控制器.rb

class UploadStepsController < ApplicationController
include Wicked::Wizard
steps :audience, :rewards, :review

def show
    @upload = current_user.uploads
    render_wizard
end

def update
    @upload = current_user.uploads
    @upload.attributes = params[:upload]
    render_wizard @upload
end


end

class Upload < ActiveRecord::Base
attr_accessible :title, :tagline, :category, :genre, :length, :description

belongs_to :user

validates :title, presence: true
validates :tagline, presence: true
validates :category, presence: true
validates :genre, presence: true
validates :length, presence: true
validates :description, presence: true
validates :user_id, presence: true

default_scope order: 'uploads.created_at DESC'
end

class UploadStepsController

upload.rb

class UploadStepsController < ApplicationController
include Wicked::Wizard
steps :audience, :rewards, :review

def show
    @upload = current_user.uploads
    render_wizard
end

def update
    @upload = current_user.uploads
    @upload.attributes = params[:upload]
    render_wizard @upload
end


end

class Upload < ActiveRecord::Base
attr_accessible :title, :tagline, :category, :genre, :length, :description

belongs_to :user

validates :title, presence: true
validates :tagline, presence: true
validates :category, presence: true
validates :genre, presence: true
validates :length, presence: true
validates :description, presence: true
validates :user_id, presence: true

default_scope order: 'uploads.created_at DESC'
end

类上传

新错误

NoMethodError in UploadStepsController#update
undefined method `save' for #<ActiveRecord::Relation:0x0000010159c098>

app/controllers/upload_steps_controller.rb:13:in `update'

NoMethodError在UploadStepsController中#更新
未定义的方法“保存”#
app/controllers/upload\u steps\u controller.rb:13:in'update'

试试这个：

@upload.update_attributes(params[:upload])

---

当前_user.uploads是AREL对象。因此，您必须指定要更新的上载内容。例如，第一个用户上传

current_user.uploads.first.update_attributes(params[:upload])

或许

@upload = current_user.uploads.find(params[:upload].delete(:id))
@upload.update_attributes(params[:upload])

还是所有记录

@upload = current_user.uploads
@upload.update_all(params[:upload])

---

@upload=current_user.uploads，它为您提供uploads对象的数组，但属性方法适用于单个对象。所以你必须应用每种方法

@uploads = current_user.uploads
@uploads.each do | upload|
  upload.update_attributes(params[:upload])
end

---

上传看起来像是复数？属性是针对单个记录的。它是复数，因为一个用户可以有多个上传。有什么办法可以解决这个问题吗？在我粘贴这个之前，属性出现了错误：@upload=current_user.uploads（params[：upload]）@upload.update_all（params[：upload]）……现在我得到了一个无方法错误，未定义的方法“save”……我假设这与邪恶的向导gem有关。有什么建议吗？上传活动记录模型？hm arel对象…这意味着你在当前用户上使用更新属性。上传…你必须先使用或查找…或更新。我需要更清楚地解释这一点。我需要做的是允许登录用户上传一个文件，并填写与该文件相关的几个属性。我用一个巫师来处理邪恶的巫师宝石。我一直在关注这段视频以实现以下目标：。我在视频中看到了6点16分，这是我目前的问题。这是否使我需要做的事情变得更清楚？让我知道你的想法，我真的很感谢你的帮助！